奥氏体化过程中热冲压钢Al-Si镀层的组织演化

doi:10.13251/j.issn.0254-6051.2021.11.039

金属热处理 ›› 2021, Vol. 46 ›› Issue (11): 220-225.DOI: 10.13251/j.issn.0254-6051.2021.11.039

奥氏体化过程中热冲压钢Al-Si镀层的组织演化

王俊辉, 崔青玲, 曾林林, 高欣宇, 梁佳伟

东北大学轧制技术及连轧自动化国家重点实验室, 辽宁沈阳 110819

收稿日期:2021-05-17 出版日期:2021-11-25 发布日期:2021-12-08
通讯作者: 崔青玲,副教授,博士,E-mail:cuiql@mail.neu.edu.cn
作者简介:王俊辉(1995—),男,硕士研究生,主要研究方向为先进高强钢镀层,E-mail:Wangjunhui228416@163.com

Microstructure evolution of Al-Si coating on hot stamping steel during austenitizing

Wang Junhui, Cui Qingling, Zeng Linlin, Gao Xinyu, Liang Jiawei

State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang Liaoning 110819, China

Received:2021-05-17 Online:2021-11-25 Published:2021-12-08

摘要/Abstract

摘要： 利用差示扫描量热仪、场发射电子探针和激光共聚焦显微镜研究了22MnB5热冲压钢奥氏体化过程中Al-Si镀层的组织演化。镀层板升温过程中,Al-Si镀层在570 ℃左右熔化;由于温度较低,Al、Fe、Si原子的扩散受到Fe₂SiAl₇阻挡。当温度升到610 ℃左右时,扩散到镀层的Al原子增多,使得Fe₂Al₅进一步生长;Si原子向基体和镀层外表面扩散,由于Fe₂Al₅溶解Si原子能力弱,因此在Fe₂Al₅晶界处形成一层沉淀物FeSiAl₂,其余的Si原子就扩散在镀层表面形成Fe₂SiAl₇。750 ℃时,Al原子扩散到基体中形成了Fe₃Al;镀层中的Fe原子增加使Fe₂Al₅和FeAl₂不断生长;由于Fe₂Al₅和FeAl₂相中Si原子的溶解度低,因此会在晶界处形成Fe₃SiAl₅沉淀物;与Fe₂Al₅、Fe₃SiAl₅、Fe₃Al相比,FeAl₂相的生长速度更快,所占Al-Si镀层整体体积最大,这是因为FeAl₂正交晶格中沿c轴的高空位率(30%)导致了FeAl₂相的生长动力学更强。

关键词: 差示扫描量热仪, Al-Si镀层, 金属间化合物, 热冲压钢

Abstract: Microstructure evolution of Al-Si coating during austenitization process on the 22MnB5 hot stamping steel was studied by means of differential scanning calorimeter, field emission electron probe and laser confocal microscope. The results show that during the heating process of the coated plate, the Al-Si coating melts at about 570 ℃. Due to the lower temperature, the diffusion of Al, Fe, and Si atoms is blocked by Fe₂SiAl₇. When the temperature rises to about 610 ℃, the diffusion of Al atoms into the coating increases, which makes Fe₂Al₅ further grow; Si atoms diffuse to the outer surface of the coating and the substrate. Because Fe₂Al₅ has a weak ability to dissolve Si atoms, a layer is formed at the Fe₂Al₅ grain boundary in which precipitate is FeSiAl₂, and the remaining Si atoms diffuse on the surface of the coating to form Fe₂SiAl₇. At 750 ℃, Al atoms diffuse into the matrix to form Fe₃Al; the increase of Fe atoms in the coating makes Fe₂Al₅ and FeAl₂ continue to grow; due to the lower solubility of Si atoms in the Fe₂Al₅ and FeAl₂ phases, Fe₃SiAl₅ precipitates will form at the grain boundaries. Compared with Fe₂Al₅, Fe₃SiAl₅, Fe₃Al, the growth rate of FeAl₂ phase is faster, and it occupies the largest volume of Al-Si coating. This is because of FeAl₂ orthorhombic crystals, the high vacancy rate (30%) along the c-axis in the grid leads to stronger growth kinetics of the FeAl₂ phase.

Key words: differential scanning calorimeter, Al-Si coating, intermetallic compound, hot stamping steel

中图分类号:

TG14

王俊辉, 崔青玲, 曾林林, 高欣宇, 梁佳伟. 奥氏体化过程中热冲压钢Al-Si镀层的组织演化[J]. 金属热处理, 2021, 46(11): 220-225.

Wang Junhui, Cui Qingling, Zeng Linlin, Gao Xinyu, Liang Jiawei. Microstructure evolution of Al-Si coating on hot stamping steel during austenitizing[J]. Heat Treatment of Metals, 2021, 46(11): 220-225.

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奥氏体化过程中热冲压钢Al-Si镀层的组织演化

Microstructure evolution of Al-Si coating on hot stamping steel during austenitizing

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