Accelerated grain boundary migration in nanolaminated interstitial-free steel during chromizing
Accelerated grain boundary migration in nanolaminated interstitial-free steel during chromizing
复制标题
渗铬过程中纳米层状无铬钢晶界迁移的加速
DOI：
10.1080/21663831.2020.1827072
复制
发表时间：
2021-02
影响因子：
8.3
通讯作者：
S. Xie;S. Divinski;Y. Lei;Z. B. Wang
中科院分区：
文献类型：
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作者：
S. Xie;S. Divinski;Y. Lei;Z. B. Wang
通过表面机械滚压处理，在无间隙间隙钢表面制备了纳米层状层。在500℃热处理过程中，显微组织表现出较高的热稳定性，而在相同温度下渗铬过程中，晶界(GB)发生了显著的迁移。铬在渗铬表层中的扩散是在哈里森B型扩散区进行的。讨论了Gb能量和迁移率的提高对Gb迁移的影响，这是由于Gb的扩散和铬在纳米层结构中的富集所引起的。同时，在样品制备过程中引入的高应力也增强了粗化动力学。图形摘要影响陈述不同于通过规则的GB偏析来提高热稳定性，由于铬涂层的快速GB扩散而导致的铬的GB富集可以加速纳米层IF钢中的GB迁移。
A nanolaminated surface layer was produced on interstitial-free steel by surface mechanical rolling treatment. While the microstructure showed relatively high thermal stability during annealing at 500°C, significant grain boundary (GB) migration occurred in the nanolaminated surface layer during chromizing at the same temperature. GB diffusion of Cr was observed under the Harrison B-type regime in the chromized surface layer. The accelerated GB migration was discussed to be influenced by enhanced GB energy and mobility due to the GB diffusion and enrichment of Cr in nanolaminated structures. Meanwhile, the high stresses introduced during sample preparations also enhance the coarsening kinetics. GRAPHICAL ABSTRACT IMPACT STATEMENT Different from enhanced thermal stability by regular GB segregation, GB enrichment of Cr due to fast GB diffusion from a Cr-coating can accelerate the GB migration in nanolaminated IF steel.