摘要
通过对22MnB5钢铝硅镀层在不同压下率(10%~80%)下经奥氏体化处理后的组织结构进行对比分析,发现压下率与奥氏体化处理在调控镀层微观结构方面展现出显著的协同效应。当压下率低于50%时,尽管镀层整体厚度明显减薄,但由于Al/Si元素的剧烈扩散,扩散层反而出现增厚的现象。当压下率增至60%~80%,合金层的主要物相由Fe_(2)Al_(5)逐渐向FeAl转变,从而显著提升了镀层的抗裂性能。该现象主要归因于高压下率诱发的结构缺陷,有效缩短了元素扩散路径,进而加速了相转变过程,同时导致扩散层厚度有所降低。此外,Kirkendall孔洞与裂纹的演化过程表现出明显的临界特征,其中以60%压下率为裂纹密度显著增加的临界点。
Comparative analysis of the microstructure of Al-Si-coated 22MnB5 steel after austenitizing with different reduction rates(10%-80%)reveals a strong synergistic effect of reduction rate and austenitizing treatment on regulating the microstructure of coating.When the reduction rate is below 50%,although the overall thickness of coating decreases,intense diffusion of Al/Si element leads to unexpected thickening of the diffusion layer.When the reduction rate increases to 60%-80%,the dominant intermetallic phase in the alloy layer shifts from Fe_(2)Al_(5) to FeAl,significantly improving the crack resistance.This phenomenon is primarily due to structural defects induced by high reduction rate which effectively shorten element diffusion paths,and then accelerating phase transformation process and reducing diffusion layer thickness.Additionally,the evolution process of Kirkendall voids and cracks shows a distinct critical characteristics,with a reduction rate of 60%being the critical point for a significant increase in crack density.
作者
闫佳鹤
孙常宇
李建英
韩冰
冯运莉
刘国龙
YAN Jia-he;SUN Chang-yu;LI Jian-ying;HAN Bing;FENG Yun-li;LIU Guo-long(Hebei Iron and Steel Laboratory,North China University of Science and Technology,Tangshan 063210,China;College of Metallurgy and Energy,North China University of Science and Technology,Tangshan 063210,China;Tangshan Iron and Steel Group Co.,Ltd.,Tangshan 063600,China)
出处
《塑性工程学报》
北大核心
2026年第3期60-67,共8页
Journal of Plasticity Engineering
基金
河钢集团重点科技项目(HG2024121)
河北省创新能力提升计划项目(24461002D)
省属高校科研业务费资助项目(JJC2024013)
华北理工大学综合测试中心开放测试基金资助项目(202404)。
关键词
压下率
铝硅镀层
奥氏体化
微观结构
裂纹扩展
reduction rate
Al-Si coating
austenitizing
microstructure
crack propagation
