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Nb、V对热冲压成型钢组织和性能的影响

Effect of Nb and V on Microstructure and Mechanical Properties in Hot-stamping Steel
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摘要 利用光学显微镜(OM)、扫描电镜(SEM)、透射电镜(TEM)等研究了Nb、V等微合金元素对1 500 MPa级热冲压成型钢显微组织和力学性能的影响。结果表明:Nb、V微合金可以有效提高连退钢带中的马氏体、贝氏体体积分数,增加重新加热时界面形核位置,提高界面形核率,进而对试验钢的淬火-回火显微组织起到细化作用。Nb或V微合金处理后,钢中马氏体板条束尺寸和板条片间距显著降低。虽然Nb、V的添加均能提高钢的力学性能,但是与含V钢相比,含Nb钢的回火稳定性较差。 The influence of micro alloy niobium (Nb) and vanadium ( V) on microstructure and mechanical properties in hot-forming steel was investigated by optical microscope ( OM),scanning electron microscope (SEM) and transmission electron microscope (TEM). The results show that the volume fraction of martensite or bainite in continuous annealing strip increased with the microalloying addition, which would promote the recrystallization nucleation ratio during the reaustenitizing process, therefore, the microstructure would be refined effectively duringthe subsequent heat treatment process. The sizes of martensitic packets and lath lamellar spacing reduce simultaneously with micro-alloying addition for the tested steel. Though both Nb and V addition improve the mechanical properties, the Nb-bearing steel shows poor tempering stability compared with the V-bearing steel.
作者 陈俊东 郝瑛 陶维纯 李永亮 Chen Jundong;Hao Ying;Tao Weichun;TJ Yongliang(Tangshan Vocational College of Science and Technology,Tangshan 063001 , Hebei, China;Hebei Iron and Steel GroupTangsteel Company, Tangshan 063016, Hebei, China)
出处 《钢铁钒钛》 CAS 北大核心 2019年第1期136-141,共6页 Iron Steel Vanadium Titanium
基金 国家自然科学基金(51674020)资助。
关键词 热冲压成型钢 微合金化 V NB 显微组织 力学性能 hot-stamping steel micro alloy V Nb microstructure mechanical properties
作者简介 陈俊东(1972—),男,河北唐山人,高级工程师,主要从事纯净钢生产和质量改进,E-mail:cjd309@sohu.com。
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