烘烤硬化对Nb-Ti微合金钢晶界处微量元素偏析的影响

doi:10.13251/j.issn.0254-6051.2023.11.031

金属热处理 ›› 2023, Vol. 48 ›› Issue (11): 196-202.DOI: 10.13251/j.issn.0254-6051.2023.11.031

烘烤硬化对Nb-Ti微合金钢晶界处微量元素偏析的影响

宋青¹, 王立辉², 潘应君¹, 张彩东², 黄峰¹, 董伊康²

1.武汉科技大学材料与冶金学院, 湖北武汉 430081;
2.河钢材料技术研究院, 河北石家庄 050023

收稿日期:2023-06-06 修回日期:2023-09-28 出版日期:2023-11-25 发布日期:2023-12-27
通讯作者: 潘应君,教授,E-mail:hbwhpyj@163.com
作者简介:宋青(1997—),男,硕士研究生,主要研究方向为高性能钢铁材料,E-mail:974838674@qq.com。
基金资助:
国家自然科学基金联合基金重点项目(U21A20113)

Effect of bake hardening on trace element segregation at grain boundary of Nb-Ti micro-alloyed steel

Song Qing¹, Wang Lihui², Pan Yingjun¹, Zhang Caidong², Huang Feng¹, Dong Yikang²

1. School of Materials and Metallurgy, Wuhan University of Science and Technology, Wuhan Hubei 430081, China;
2. Hegang Material Technology Research Institute, Shijiazhuang Hebei 050023, China

Received:2023-06-06 Revised:2023-09-28 Online:2023-11-25 Published:2023-12-27

摘要/Abstract

摘要： 探究了烘烤硬化钢(HC180B)烘烤硬化过程析出行为对力学性能的影响。利用光学显微镜(OM)、透射电镜(TEM)和三维原子探针(3DAP)研究了位错、析出物以及C、N等原子在晶界处的偏析行为。结果表明,2%预拉伸形变及其烘烤后的屈服强度相比冷轧退火板分别提高了2 MPa及73 MPa。3DAP及TEM表明,退火冷轧板中仅有C原子在晶界处轻微偏聚,N、Ti和Nb均匀分布在晶粒中;而2%预拉伸形变后,C、Ti和Nb在晶界处有不同程度的偏聚现象,根据二者吉布斯自由能和晶界处原子浓度差异得出,TiC多呈矩形状在晶界处优先大量析出,NbC微量析出;2%预拉伸形变烘烤后,C、Ti和Nb在晶界处偏聚更明显,NbC呈椭球形在晶界处大量析出,TiC微量析出,不同状态下的N原子分布都较为均匀,而Ti、Nb碳化物则以复合析出的形式出现。

关键词: HC180B钢, 原子空间分布, 偏析, 晶界, 碳化物

Abstract: Effect of precipitation behavior during bake hardening on the mechanical properties of the bake hardening steel (HC180B) was investigated. The segregation behavior of dislocations, precipitates and atoms such as C and N at grain boundaries was studied by means of optical microscope (OM), transmission electron microscope (TEM) and three-dimensional atom probe (3DAP). The results show that the yield strength of 2% pre-tensile deformed specimen and that of the baked one is increased by 2 MPa and 73 MPa compared with that of the annealed cold-rolled plates, respectively. 3DAP and TEM results show that only C atoms in the annealed cold-rolled sheet are slightly segregated at the grain boundary, and N, Ti and Nb are evenly distributed in the grain. After 2% pre-stretching deformation, C, Ti and Nb are different degrees of segregation at the grain boundary. According to the difference between the Gibbs free energy and the atomic concentration at the grain boundary, it can be concluded that TiC is mostly rectangular and preferentially precipitates at the grain boundary, and NbC precipitates in a small amount. After 2% pre-stretching deformation and baking, the segregation of C, Ti and Nb at the grain boundary is more obvious, NbC precipitates in a large amount at the grain boundary in the form of an ellipsoid, TiC precipitates in a small amount, and the distribution of N atoms in different states is relatively uniform, while Ti and Nb carbides appear in the form of compound precipitation.

Key words: HC180B steel, atomic space distribution, segregation, grain boundary, carbides

中图分类号:

TG142.1

宋青, 王立辉, 潘应君, 张彩东, 黄峰, 董伊康. 烘烤硬化对Nb-Ti微合金钢晶界处微量元素偏析的影响[J]. 金属热处理, 2023, 48(11): 196-202.

Song Qing, Wang Lihui, Pan Yingjun, Zhang Caidong, Huang Feng, Dong Yikang. Effect of bake hardening on trace element segregation at grain boundary of Nb-Ti micro-alloyed steel[J]. Heat Treatment of Metals, 2023, 48(11): 196-202.

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烘烤硬化对Nb-Ti微合金钢晶界处微量元素偏析的影响

Effect of bake hardening on trace element segregation at grain boundary of Nb-Ti micro-alloyed steel

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