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直流电位差法测量316L管道疲劳裂纹扩展的研究 预览
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作者 许新军 《热处理技术与装备》 2019年第2期62-66,共5页
本文首先介绍了用直流电位差法测量疲劳裂纹长度的基本原理、实现方法及所用的仪表。并采用直流电位法测量系统测试固溶处理的316L电气管道的疲劳裂纹扩展速率。试验结果表明:利用CT试样做降K试验时一定要保证后一阶段的裂纹扩展完全穿... 本文首先介绍了用直流电位差法测量疲劳裂纹长度的基本原理、实现方法及所用的仪表。并采用直流电位法测量系统测试固溶处理的316L电气管道的疲劳裂纹扩展速率。试验结果表明:利用CT试样做降K试验时一定要保证后一阶段的裂纹扩展完全穿过前阶段造成的塑性区域。当裂纹长度的表征值a/W>0.55时,如果K>30 MPa/m疲劳开裂可能偏离试样的平面应变准则较大,所测量到的裂纹扩展速率会有较大误差。1030的降K实验结果和1033的升K实验结果是试样的真正的疲劳裂纹扩展速率。 展开更多
关键词 316L 直流电位差 疲劳裂纹扩展速率
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316L表面激光熔覆复合微弧氧化制备陶瓷涂层 预览 被引量:1
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作者 孙敏 吴国龙 +3 位作者 王晔 张群莉 姚建华 Volodymyr S.Kovalenko 《表面技术》 EI CAS CSCD 北大核心 2019年第2期24-32,共9页
目的提高316L不锈钢表面的耐蚀性和生物活性。方法首先采用激光熔覆技术在316L不锈钢表面制备钛层,然后对钛层表面进行微弧氧化处理,从而在316L不锈钢表面制备出含有Ca、P元素的多孔状陶瓷涂层。利用扫描电子显微镜(ScanningElectronMic... 目的提高316L不锈钢表面的耐蚀性和生物活性。方法首先采用激光熔覆技术在316L不锈钢表面制备钛层,然后对钛层表面进行微弧氧化处理,从而在316L不锈钢表面制备出含有Ca、P元素的多孔状陶瓷涂层。利用扫描电子显微镜(ScanningElectronMicroscope,SEM)、能谱仪(EnergyDispersiveSpectrometer,EDS)、X射线衍射仪(X-RayDiffraction,XRD)分析了钛层厚度对陶瓷涂层的表面显微形貌、元素含量及物相组成的影响。利用电化学实验、浸泡实验分别测试了涂层在1.5倍SBF溶液中的耐蚀性能和生物活性。结果通过激光熔覆复合微弧氧化能够在316L不锈钢表面制备出多孔状陶瓷涂层。随着钛层厚度的增加,微弧氧化原位生成的陶瓷涂层致密度、厚度也增加。当钛层厚度达到0.4mm时,微弧氧化后得到的陶瓷涂层完整致密,厚度达到20μm。涂层主要由锐钛矿相TiO2、金红石相TiO2组成。极化曲线分析可知,腐蚀电位Ecorr为.0.162V,腐蚀电流密度降至5.11×10.7A/cm2。陶瓷涂层在1.5倍SBF中浸泡3天后表面即有羟基磷灰石沉积。结论通过激光熔覆复合微弧氧化在316L不锈钢表面制备的陶瓷涂层在模拟体液环境下具有较好的耐蚀性能,同时也具备良好的生物活性。 展开更多
关键词 316L 激光熔覆 微弧氧化 生物活性 耐蚀性
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一种车用压缩天然气(CNG)取样气瓶的性能测试分析
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作者 郭艳艳 卢其伦 《标准科学》 2019年第10期139-144,共6页
为了提高CNG取样的安全性能,本研究基于取样气瓶设计压力为30MPa、气瓶材料采用316L超低碳奥氏体铬镍钼不锈钢且内层喷涂聚四氟乙烯(PTFE)的基础上,对气瓶及涂层的紫外耐受能力、耐温性能、耐腐蚀性能、耐压能力及压力与壁厚进行研究,... 为了提高CNG取样的安全性能,本研究基于取样气瓶设计压力为30MPa、气瓶材料采用316L超低碳奥氏体铬镍钼不锈钢且内层喷涂聚四氟乙烯(PTFE)的基础上,对气瓶及涂层的紫外耐受能力、耐温性能、耐腐蚀性能、耐压能力及压力与壁厚进行研究,得到本试验设计气瓶在室外取样作业中具有良好的紫外耐受能力、耐温性、化学稳定性及耐压能力,可在CNG的取样中安全广泛的使用。 展开更多
关键词 压缩天然气(CNG) 取样气瓶 316L 聚四氟乙烯
Grain boundary and microstructure engineering of Inconel 690 cladding on stainless-steel 316L using electron-beam powder bed fusion additive manufacturing
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作者 I.A. Segura L.E. Murr +7 位作者 C.A. Terrazas D. Bermudez J. Mireles V.S.V. Injeti K. Li B. Yu R.D.K.Misra R.B. Wicker 《材料科学技术学报:英文版》 SCIE EI CAS CSCD 2019年第2期351-367,共17页
This research explores the prospect of fabricating a face-centered cubic(fcc) Ni-base alloy cladding(Inconel 690) on an fcc Fe-base alloy(316 L stainless-steel) having improved mechanical properties and reduced sensit... This research explores the prospect of fabricating a face-centered cubic(fcc) Ni-base alloy cladding(Inconel 690) on an fcc Fe-base alloy(316 L stainless-steel) having improved mechanical properties and reduced sensitivity to corrosion through grain boundary and microstructure engineering concepts enabled by additive manufacturing(AM) utilizing electron-beam powder bed fusion(EPBF). The unique solidification and associated constitutional supercooling phenomena characteristic of EPBF promotes[100] textured and extended columnar grains having lower energy grain boundaries as opposed to random, high-angle grain boundaries, but no coherent {111} twin boundaries characteristic of conventional thermo-mechanically processed fcc metals and alloys, including Inconel 690 and 316 L stainless-steel.In addition to [100] textured grains, columnar grains were produced by EPBF fabrication of Inconel 690 claddings on 316 L stainless-steel substrates. Also, irregular 2–3 μm diameter, low energy subgrains were formed along with dislocation densities varying from 108 to 109 cm2, and a homogeneous distribution of Cr23C6 precipitates. Precipitates were formed within the grains(with 3 μm interparticle spacing),but not in the subgrain or columnar grain boundaries. These inclusive, hierarchical microstructures produced a tensile yield strength of 0.527 GPa, elongation of 21%, and Vickers microindentation hardness of 2.33 GPa for the Inconel 690 cladding in contrast to a tensile yield strength of 0.327 GPa, elongation of 53%, and Vickers microindentation hardness of 1.78 GPa, respectively for the wrought 316 L stainlesssteel substrate. Aging of both the Inconel 690 cladding and the 316 L stainless-steel substrate at 685?C for50 h precipitated Cr23C6 carbides in the Inconel 690 columnar grain boundaries, but not in the low-angle(and low energy) subgrain boundaries. In contrast, Cr23C6 carbides precipitated in the 316 L stainless-steel grain boundaries, but not in the low energy coherent {111} twin boundaries. Consequently, the Inconel6 展开更多
关键词 Additive manufacturing ELECTRON-BEAM powder bed FUSION (EPBF) INCONEL 690 CLADDING 316L stainless steel Grain boundary engineering Materials characterization Mechanical properties
Anisotropy in mechanical properties and corrosion resistance of 316L stainless steel fabricated by selective laser melting 预览
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作者 Xiao-qing Ni De-cheng Kong +5 位作者 Ying Wen Liang Zhang Wen-heng Wu Bei-bei He Lin Lu De-xiang Zhu 《矿物冶金与材料学报:英文版》 SCIE EI CAS CSCD 2019年第3期319-328,共10页
The corrosion behavior and mechanical properties of 316L stainless steel (SS) fabricated via selective laser melting (SLM) were clarified by potentiodynamic polarization measurements, immersion tests, and tensile expe... The corrosion behavior and mechanical properties of 316L stainless steel (SS) fabricated via selective laser melting (SLM) were clarified by potentiodynamic polarization measurements, immersion tests, and tensile experiments. The microstructural anisotropy of SLMed 316L SS was also investigated by electron back-scattered diffraction and transmission electron microscopy. The grain sizes of the SLMed 316L SS in the XOZ plane were smaller than those of the SLMed 316L SS in the XOY plane, and a greater number of low-angle boundaries were present in the XOY plane, resulting in lower elongation for the XOY plane than for the XOZ plane. The SLMed 316L was expected to exhibit higher strength but lower ductility than the wrought 316L, which was attributed to the high density of dislocations. The pitting potentials of the SLMed 316L samples were universally higher than those of the wrought sample in chloride solutions because of the annihilation of MnS or (Ca,Al)-oxides during the rapid solidification. However, the molten pool boundaries preferentially dissolved in aggressive solutions and the damage of the SLMed 316L in FeCl3 solution was more serious after long-term service, indicating poor durability. 展开更多
关键词 selective laser MELTING mechanical property corrosion resistance 316L STAINLESS steel ANISOTROPY MOLTEN POOL boundary
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宝宝的私人助理 预览
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作者 SwaT YU(图) 《微型计算机》 2019年第8期58-59,共2页
近日,小米发布了两款儿童品类新品,分别是萌趣外形材质安全的米兔儿童保温杯,以及高颜值低噪音的米兔婴儿理发器,两款产品都延续了小米的高性价比风格。其中,采用316L不锈钢内胆的米兔儿童保温杯,售价仅为129元。而采用了陶瓷刀头设计... 近日,小米发布了两款儿童品类新品,分别是萌趣外形材质安全的米兔儿童保温杯,以及高颜值低噪音的米兔婴儿理发器,两款产品都延续了小米的高性价比风格。其中,采用316L不锈钢内胆的米兔儿童保温杯,售价仅为129元。而采用了陶瓷刀头设计并通过多项安全认证的米兔婴儿理发器,售价最低仅需99元。 展开更多
关键词 安全认证 不锈钢内胆 高性价比 316L 保温杯 理发器 儿童 低噪音
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液氯贮槽用液位计及其材质 预览
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《氯碱工业》 CAS 2019年第8期47-48,共2页
A:请教各位氯碱同行,液氯贮槽有用磁翻板液位计的吗?磁翻板液位计用的是什么材质?B:我们单位用的是不锈钢衬聚四氟乙烯,低温型的。C:我们单位用的是不锈钢316L。D:@A我们的磁翻板液位计基本上是“摆设”。E:是的,基本都是摆设。D:我们... A:请教各位氯碱同行,液氯贮槽有用磁翻板液位计的吗?磁翻板液位计用的是什么材质?B:我们单位用的是不锈钢衬聚四氟乙烯,低温型的。C:我们单位用的是不锈钢316L。D:@A我们的磁翻板液位计基本上是“摆设”。E:是的,基本都是摆设。D:我们单位用的是外测式磁翻板液位计。A:我们单位已用超声波液位计了,是专家现场检查时提出加装的。D:那就加个做样子了,起不到什么作用。 展开更多
关键词 超声波液位计 液氯贮槽 材质 聚四氟乙烯 316L 现场检查 不锈钢 翻板
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Crevice Corrosion Behaviors Between CFRP and Stainless Steel 316L for Automotive Applications
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作者 Xia-Yu Wu Jia-Kun Sun +2 位作者 Jia-Ming Wang Yi-Ming Jiang Jin Li 《金属学报:英文版》 SCIE EI CAS CSCD 2019年第10期1219-1226,共8页
Carbon fiber reinforced plastics (CFRP) are promising lightweight materials for vehicle applications. 316L is one of the most widely used types of austenite stainless steels and applied in lots of automotive applicati... Carbon fiber reinforced plastics (CFRP) are promising lightweight materials for vehicle applications. 316L is one of the most widely used types of austenite stainless steels and applied in lots of automotive applications. The existence of crevices will result in galvanic corrosion and crevice corrosion when CFRPs and 316L are directly connected. A crevice former for the galvanic system was therefore designed and applied to evaluate the crevice corrosion behaviors and study the mechanism of galvanic crevice corrosion through several electrochemical techniques in this research. The results showed that the crevice corrosion of galvanic systems grew from crevice mouth to the inside crevice and could be divided into four steps, metastable pitting corrosion at the crevice mouth, initiating step of crevice corrosion, propagating step and ending step of crevice corrosion. Because of the influences of the galvanic system, electrode reaction rates were speeded up and the passivation region was shortened at the initiating stage of crevice corrosion. Corrosion rate was observed to be higher in the galvanic system than that in normal crevice systems. 展开更多
关键词 Crevice corrosion Galvanic system Carbon FIBER reinforced plastics 316L STAINLESS STEELS
Friction and Wear Study on Friction Pairs with a Biomimetic Non-smooth Surface of 316L Relative to CF/PEEK under a Seawater Lubricated Condition 预览
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作者 Yingna Liang Dianrong Gao +1 位作者 Bo Chen Jianhua Zhao 《中国机械工程学报:英文版》 SCIE EI CAS CSCD 2019年第4期47-60,共14页
Current studies of a seawater axial piston pump mainly solve the problems of corrosion and wear in a slipper pair by selecting materials with corrosion resistance, self-lubrication, and wear resistance. In addition, a... Current studies of a seawater axial piston pump mainly solve the problems of corrosion and wear in a slipper pair by selecting materials with corrosion resistance, self-lubrication, and wear resistance. In addition, an appropriate biomimetic non-smooth surface design for the slipper pair can further improve the tribological behavior. In this paper, 316 L stainless steel and CF/PEEK were selected to process the upper and bottom specimens, and the biomimetic non-smooth surface was introduced into the interface between the friction pair. The friction and wear tests were performed on a MMD-5 A tester at a rotation speed of 1000 r/min and load of 200 N under seawater lubricated condition. The results indicate that the main friction form of the smooth surface friction pair corresponds to abrasive wear and adhesive wear and that it exhibits a friction coe cient of 0.05–0.07, a specimen temperature of 56 ℃, a high wear rate, and surface roughness. Pits on the non-smooth surface friction pairs produced hydrodynamic lubrication and reduced abrasive wear, and thus the plowing e ect is their main friction form. The non-smooth surface friction pairs exhibit a friction coe cient of 0.03–0.04, a specimen temperature of 48 ℃, a low wear rate, and surface roughness. The study has important theoretical significance for enriching the lubrication, friction, and wear theory of a seawater axial piston pump, and economic significance and military significance for promoting the marine development and the national defense military. 展开更多
关键词 BIOMIMETIC NON-SMOOTH surface 316L CF/PEEK Seawater LUBRICATION FRICTION and WEAR
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储氢床不锈钢疲劳寿命预测及棘轮效应和应变强化竞争机理描述 预览
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作者 田何易 寇化秦 +1 位作者 曾祥国 陈华燕 《材料科学》 2019年第7期726-740,共15页
开发具有高效、安全的氢同位素储存与供给技术的储氢床对国际热核聚变实验反应堆(ITER-International Thermonuclear Experimental Reactor)和中国聚变工程实验堆(CFETR-Chinese Fusion Engineering Testing Reactor)的发展和应用尤为... 开发具有高效、安全的氢同位素储存与供给技术的储氢床对国际热核聚变实验反应堆(ITER-International Thermonuclear Experimental Reactor)和中国聚变工程实验堆(CFETR-Chinese Fusion Engineering Testing Reactor)的发展和应用尤为重要。储氢床中316L (N)不锈钢的功能是结构支承和传热散热,对其在循环载荷作用下进行稳定性评价关系到整个储氢系统的安全,引起学术界高度重视。根据现有的应力循环条件下的疲劳寿命实验结果,以BP神经网络算法建立了疲劳寿命模型,编制了相应的Matlab代码预测疲劳寿命,并与现有的本构预测模型(Basquin-Coffin-Manson模型、SWT模型和模型三)进行对比,结果表明:BP神经网络的预测结果与实验数据吻合良好,优于现有的本构模型,并解释了非对称应力循环条件下,平均应力强化和棘轮效应对疲劳寿命影响的竞争机制。论文还对疲劳蠕变寿命进行了预测,得到的预测结果与实验数据吻合良好。本文提供的方法和获得的数据对于储氢床设计和安全运营具有重要的参考价值。 展开更多
关键词 316L (N)不锈钢 循环载荷 疲劳寿命 蠕变寿命 BP神经网络模型 竞争机理
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尿素级不锈钢316L mod焊接工艺研究 预览
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作者 张新明 车昌盛 +2 位作者 郭海玲 蒋勇 蒋俊 《焊接技术》 2019年第2期53-55,共3页
大化肥项目中使用的尿素级不锈钢316L mod,焊缝质量要求高,对管道运行安全影响重大。本试验从焊材、焊接工艺、焊缝性能等方面进行了研究,对焊缝铁素体含量、耐晶间腐蚀性能、焊缝选择性腐蚀等进行了检测,验证了工艺可靠性,对保证焊缝... 大化肥项目中使用的尿素级不锈钢316L mod,焊缝质量要求高,对管道运行安全影响重大。本试验从焊材、焊接工艺、焊缝性能等方面进行了研究,对焊缝铁素体含量、耐晶间腐蚀性能、焊缝选择性腐蚀等进行了检测,验证了工艺可靠性,对保证焊缝质量及指导现场焊接作业具有很好的指导意义。 展开更多
关键词 316L MOD 焊接 耐晶间腐蚀试验 选择性腐蚀试验
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Mechanical properties and corrosion behavior of selective laser melted 316L stainless steel after different heat treatment processes
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作者 Decheng Kong Chaofang Dong +6 位作者 Xiaoqing Ni Liang Zhang Jizheng Yao Cheng Man Xuequn Cheng Kui Xiao Xiaogang Li 《材料科学技术学报:英文版》 SCIE EI CAS CSCD 2019年第7期1499-1507,共9页
Irregular grains, high interfacial stresses and anisotropic properties widely exist in 3D-printed metallic materials, and this paper investigated the effects of heat treatment on the microstructural, mechanical and co... Irregular grains, high interfacial stresses and anisotropic properties widely exist in 3D-printed metallic materials, and this paper investigated the effects of heat treatment on the microstructural, mechanical and corrosion properties of 316 L stainless steel fabricated by selective laser melting. Sub-grains and low-angle boundaries exist in the as-received selective laser melted(SLMed) 316 L stainless steel. After heat treatment at 1050℃, the sub-grains and low-angle boundaries changed slightly, and the stress state and strength decreased to some extent due to the decrease of dislocation density. After heat treatment at 1200℃, the grains became uniform, and the dislocation cells vanished, which led to a sharp decline in the hardness and strength. However, the ductility was improved after recrystallization heat treatment.The passive film thickness and corrosion potential of the SLMed 316 L stainless steel decreased after heat treatment, and the pitting potential also decreased due to the accelerated transition from metastable to steady-state pitting;this accelerated transition was caused by the presence of weak passive films at the enlarged pores after heat treatment, especially for an adequate solid solution treatment. 展开更多
关键词 316L STAINLESS steel SELECTIVE LASER MELTING Heat treatment Microstructure Mechanical property Corrosion behaviour
Enhanced mechanical properties and formability of 316L stainless steel materials 3D-printed using selective laser melting 预览
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作者 Xiao-qin Yang Ying Liu +3 位作者 Jin-wen Ye Ren-quan Wang Ting-chuan Zhou Bin-yang Mao 《矿物冶金与材料学报:英文版》 SCIE EI CAS CSCD 2019年第11期1396-1404,共9页
This study is conducted to develop an innovative and attractive selective laser melting(SLM)method to produce 316 L stainless steel materials with excellent mechanical performance and complex part shape.In this work,t... This study is conducted to develop an innovative and attractive selective laser melting(SLM)method to produce 316 L stainless steel materials with excellent mechanical performance and complex part shape.In this work,the subregional manufacturing strategy,which separates the special parts from the components using an optimized process,was proposed.The results showed that produced 316 L materials exhibited superior strength of~755 MPa and good ductility.In the as-built parts,austenite with preferred orientation of the(220)plane,δ-ferrite,and a small amount of CrO phases were present.In addition,the crystal size was fine,which contributed to the enhancement of the parts’mechanical properties.The structural anisotropy mechanism of the materials was also investigated for a group of half-sized samples with variable inclination directions.This technique was used to fabricate a set of impellers with helical bevels and high-precision planetary gears,demonstrating its strong potential for use in practical applications. 展开更多
关键词 316L STAINLESS steel SELECTIVE laser MELTING FORMABILITY mechanical properties microstructure
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化工厂316L输送管道失效原因分析 预览
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作者 刘铭奇 董逢寅 董羲武 《失效分析与预防》 2018年第6期373-377,共5页
材质为316L不锈钢的半成品柴油输送管道在水平段底部出现快速腐蚀,9个月出现5次泄露。通过宏观分析、化学成分检测、力学性能测试、金相分析、腐蚀产物物相分析、腐蚀介质有害相分析、腐蚀产物分析等方法,对管道失效原因进行分析。结果... 材质为316L不锈钢的半成品柴油输送管道在水平段底部出现快速腐蚀,9个月出现5次泄露。通过宏观分析、化学成分检测、力学性能测试、金相分析、腐蚀产物物相分析、腐蚀介质有害相分析、腐蚀产物分析等方法,对管道失效原因进行分析。结果表明:不锈钢管线腐蚀属于氧腐蚀及点蚀;氧化铁等腐蚀产物或杂质随介质在管线底部流动,对管线底部形成线状冲刷磨损,破坏了钝化膜的保护作用,造成管线底部率先腐蚀;腐蚀环境中Cl^-极易破坏不锈钢表面的钝化膜,形成坑蚀,成为孔蚀延伸的活性中心。 展开更多
关键词 化工厂 316L 水平段底部 Cl^- 氧腐蚀
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熔覆层厚度对激光熔覆316L涂层组织及性能的影响 预览
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作者 陈刚 范才河 +1 位作者 曾广胜 刘彬 《湖南大学学报:自然科学版》 CSCD 北大核心 2018年第12期53-58,共6页
利用YLS-6000型掺镱光纤激光器在27SiMn液压支架立柱表面进行不同厚度单道次316L合金粉末熔覆,采用光学显微镜(OM)、扫描电镜(SEM)、能谱(EDS)、显微硬度计及电化学分析等手段,研究了熔覆层厚度对涂层组织、力学性能及耐腐蚀性能的影响... 利用YLS-6000型掺镱光纤激光器在27SiMn液压支架立柱表面进行不同厚度单道次316L合金粉末熔覆,采用光学显微镜(OM)、扫描电镜(SEM)、能谱(EDS)、显微硬度计及电化学分析等手段,研究了熔覆层厚度对涂层组织、力学性能及耐腐蚀性能的影响.结果表明:随着熔覆层厚度的增加,熔覆层组织由单一的柱状晶结构演变为平面晶、柱状晶和树枝状晶组成的层状结构,熔覆表层的显微硬度不断降低,熔覆层的自腐蚀电位和极化电阻率不断增大,自腐蚀电流密度不断减小;与0.3mm、0.5mm厚熔覆试样比较,1.0mm厚熔覆层试样的自腐蚀电位和极化电阻率值均最大,分别达0.053V和22.881Ω·cm^2,自腐蚀电流密度最小,为1.018mA·cm^-2.综合得出,1.0mm厚熔覆层试样的耐腐蚀性最佳. 展开更多
关键词 激光熔覆 316L 微观组织 显微硬度 耐腐蚀性
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选区激光熔化316L温度场研究
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作者 段成红 郝晓杰 罗翔鹏 《应用激光》 CSCD 北大核心 2018年第5期748-753,共6页
针对选区激光熔化单层316L,采用ABAQUS软件,利用DFLUX子程序编译移动双椭球热源并结合USDFLD子程序实现材料属性转变的方法数值模拟SLM过程,考虑了材料由粉体转化为实体的热物性参数和相变潜热对SLM的影响,分析了单层扫描过程中温... 针对选区激光熔化单层316L,采用ABAQUS软件,利用DFLUX子程序编译移动双椭球热源并结合USDFLD子程序实现材料属性转变的方法数值模拟SLM过程,考虑了材料由粉体转化为实体的热物性参数和相变潜热对SLM的影响,分析了单层扫描过程中温度场的变化规律,包括扫描轨道中点的温度变化、熔池存在时间以及熔池结构。研究结果发现,随着扫描轨道逐渐增加,扫描轨道中点的峰值温度、熔池存在时间及熔池结构在初始阶段增幅较大,之后变得相对平缓并达到稳定状态。表明在SLM过程中,随着扫描轨道增加,扫描区域的温度场会逐渐处于动态稳定状态。 展开更多
关键词 选区激光熔化 温度场 ABAQUS子程序 316L
不同种类激光熔覆粉末的性能研究 预览
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作者 张自强 程相榜 白海明 《南阳师范学院学报》 CAS 2018年第4期22-29,共8页
选取铁基不锈钢316L、超级不锈钢、Ni基合金为研究对象,采用激光熔覆技术将粉末熔覆在合金钢表面,以SEM图像表征熔覆层的微观结构,采用EDS能谱分析研究熔覆层和基体的化学成分,采用拉伸试验机测试熔覆层的弯曲性能,通过盐雾试验法、极... 选取铁基不锈钢316L、超级不锈钢、Ni基合金为研究对象,采用激光熔覆技术将粉末熔覆在合金钢表面,以SEM图像表征熔覆层的微观结构,采用EDS能谱分析研究熔覆层和基体的化学成分,采用拉伸试验机测试熔覆层的弯曲性能,通过盐雾试验法、极化电位法研究了熔覆层的耐盐雾腐蚀性能.结果表明:316L熔覆层晶粒形貌不规则,晶粒较大有部分柱状晶;超级不锈钢熔覆层组织较均匀,存在大量的等轴晶;而Ni基合金熔覆层的组织均匀,存在一定数量的析出相,且析出相均匀、细小;Ni基合金在熔覆层位置处的硬度明显高于316L和超级不锈钢;三种材料的熔覆层与基体有较明显的分界;熔合区宽度约为100μm;检测点的化学成分组成与熔覆材料和基体的成分一致;熔覆层和基体达到很好的结合强度;三种材料的熔覆层经480 h铜加速盐雾腐蚀试验后,熔覆层表面未出现肉眼可见的红斑或红锈. 展开更多
关键词 激光熔覆 316L 超级不锈钢 镍基合金 微观组织 硬度 CASS盐雾试验 化学成分
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膜致应力对应力腐蚀裂纹尖端蠕变特性的影响
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作者 李凯 薛河 +2 位作者 崔英浩 王帅 宋瑞寒 《热加工工艺》 CSCD 北大核心 2018年第6期57-60,共4页
应力腐蚀开裂(SCC)是核电一回路安全端在服役过程中的一种重要失效形式。针对SCC裂尖基体金属在高温高压条件下发生的蠕变现象,利用ABAQUS模拟了在高温水环境下膜致应力对316L不锈钢应力腐蚀裂纹尖端蠕变特性的影响。结果表明:蠕变后... 应力腐蚀开裂(SCC)是核电一回路安全端在服役过程中的一种重要失效形式。针对SCC裂尖基体金属在高温高压条件下发生的蠕变现象,利用ABAQUS模拟了在高温水环境下膜致应力对316L不锈钢应力腐蚀裂纹尖端蠕变特性的影响。结果表明:蠕变后,基体金属裂尖的应力、塑性变形、蠕变率和裂纹扩展率都会随之增大,进而使裂尖氧化膜破裂的倾向更加明显。 展开更多
关键词 应力腐蚀开裂 316L 膜致应力 蠕变
T91和316L钢在氧控铅铋中600小时后腐蚀产物分析 预览
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作者 李明扬 姜志忠 +3 位作者 陈刘利 黄群英 凤仪 FDS凤麟核能团队 《核科学与工程》 CSCD 北大核心 2018年第5期784-789,共6页
本文开展了铅铋反应堆典型候选结构材料T91和316L钢在温度480℃、氧质量分数106%、流速0.3m/s的铅铋合金环境中600h的初步腐蚀实验研究。利用显微镜(SEM)、能谱仪(EDS)和X射线衍射仪(XRD)等微观测试手段,对材料的腐蚀界面形貌及产物进... 本文开展了铅铋反应堆典型候选结构材料T91和316L钢在温度480℃、氧质量分数106%、流速0.3m/s的铅铋合金环境中600h的初步腐蚀实验研究。利用显微镜(SEM)、能谱仪(EDS)和X射线衍射仪(XRD)等微观测试手段,对材料的腐蚀界面形貌及产物进行了分析,初步结果显示:在实验条件下T91和316L钢基体均未发生铅铋渗透及溶解腐蚀现象,腐蚀类型均为氧化腐蚀。T91钢样品表面氧化层较厚(约11μm),且分为内外两层:外层结构疏松,主要成分为Fe3O4。内层结构致密,主要成分为(Fe,Cr)3O4;而316L钢表面单层氧化层较薄(约1μm),主要成分为(Fe,Cr)3O4。 展开更多
关键词 铅铋合金 腐蚀 T91 316L
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一种去除铁丹红的创新方法
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作者 Dr. Lorenz Egli Sherry Tong 童雪萍 《流程工业》 2018年第15期44-46,共3页
在现今制药领域普遍使用的316和316L级别的不锈钢设备中——经常会出现材料由最初的银白光亮逐渐变为黄色、红色、褐色甚至金色、黑色等现象,这就是“铁丹红(rouge)”现象。本文介绍了如何安全、中性、快速去除不锈钢设备的铁丹红沉... 在现今制药领域普遍使用的316和316L级别的不锈钢设备中——经常会出现材料由最初的银白光亮逐渐变为黄色、红色、褐色甚至金色、黑色等现象,这就是“铁丹红(rouge)”现象。本文介绍了如何安全、中性、快速去除不锈钢设备的铁丹红沉积层。 展开更多
关键词 创新方法 除铁 不锈钢设备 316L 沉积层
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