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铁素体/贝氏体多相组织钢硬化行为表征参数

Characterization parameters for strain hardening behavior of ferrite/bainite multi-phase steel
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摘要 为了研究大变形管线钢应变硬化行为及其表征参数之间关联性,采用TMCP工艺调控制备了9种不同贝氏体体积分数的铁素体/贝氏体(F/B)多相组织钢。通过力学性能及应变硬化行为分析,对应变硬化指数、应力比、屈强比和伸长率等大变形管线钢应变硬化能力表征参数之间的关联性及其机制、内涵和适用范围进行了研究。结果表明,F/B多相钢中,应力比Rt2.0/Rt1.0和均匀伸长率与应变硬化指数呈线性正比关系,屈强比与应变硬化指数呈非线性反比关系,应力比Rt5.0/Rt1.0在一定条件下与应变硬化指数存在线性关系,应力比Rt1.5/Rt0.5、总伸长率、应变硬化指数之间不具备明显的关系。通过应变硬化行为分析合理阐释了以上参数之间的关联机制,并阐释了其内涵和适用范围。硬化指数、均匀伸长率和应力比Rt2.0/Rt1.0应作为描述F/B多相钢塑性形变阶段应变硬化能力的主要参数,屈强比和应力比Rt5.0/Rt1.0则应作为次要参数。采用工业化生产数据对上述结论进行了验证,与所得结论吻合良好。 In order to investigate the strain hardening behavior and the correlation of characterization parameters of high deformability pipeline steel,nine kinds of ferrite/bainite(F/B)multi-phase steels with different volume fractions of bainite were obtained by thermo-mechanical controlled processing(TMCP).The relationships among the characterization parameters of strain hardening capability for high deformation pipeline steel,such as strain hardening exponent,stress ratio,yield strength/tensile strength ratio(yield ratio)and elongation,the correlation mechanisms as well as the connotations and the scopes of application of the parameters were investigated by analyzing the mechanical properties and strain hardening behavior.The results show that the stress ratio of Rt2.0/Rt1.0 and uniform elongation have positive linear correlation with the strain hardening exponent,while yield ratio has a negative nonlinear correlation with the strain hardening exponent.There is a linear relationship between stress ratio of Rt5.0/Rt1.0 and strain hardening exponent under certain conditions,the relationships among stress ratio of Rt1.5/Rt0.5,total elongation and strain hardening exponent are not obvious.The correlation mechanisms of these parameters had been reasonably elucidated by strain hardening analysis;moreover,the connotations and scopes of application for the parameters were also discussed.It is indicated that strain hardening exponent,uniform elongation,and stress ratio of Rt2.0/Rt1.0 should be used as the major parameters for characterizing the strain hardening capability of plastic deformation stage for the F/B multi-phase steel,while yield ratio and stress ratio of Rt5.0/Rt1.0 should be used as minor parameters.Data of industrial production were employed to verify the above conclusions,and a good agreement had been obtained.
作者 汤忖江 尚成嘉 夏佃秀 周云 陈蕴博 TANG Cun-jiang;SHANG Cheng-jia;XIA Dian-xiu;ZHOU Yun;CHEN Yun-bo(State Key Laboratory of Advanced Forming Technology and Equipment,Beijing National Innovation Institute of Lightweight Ltd.,Beijing100083,China;Collaborative Innovation Center of Steel Technology,University of Science and Technology Beijing,Beijing100083,China;School of Mechanical Engineering,University of Jinan,Jinan250022,Shandong,China;Wire/Rod Group,Institute of Research of Iron and Steel,Shasteel,Zhangjiagang215625,Jiangsu,China)
出处 《钢铁研究学报》 CAS CSCD 北大核心 2019年第6期553-562,共10页 Journal of Iron and Steel Research
基金 国家重点基础研究发展计划资助项目(2010CB630801).
关键词 铁素体/贝氏体多相钢 大变形管线钢 应变硬化指数 应力比 屈强比 伸长率 ferrite/bainite multi-phase steel high deformability pipeline steel strain hardening exponent stress ratio yield strength/tensile strength ratio elongation
作者简介 汤忖江(1984—),男,博士,工程师,E-mail:tangcunjiang@163.com;通讯作者:尚成嘉(1963—),男,博士,教授,E-mail:cjshang@ustb.edu.cn
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