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首页> 外文期刊>Materials Science and Engineering >Effect of electropulsing on surface mechanical properties and microstructure of AISI 304 stainless steel during ultrasonic surface rolling process
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Effect of electropulsing on surface mechanical properties and microstructure of AISI 304 stainless steel during ultrasonic surface rolling process

机译：电脉冲对超声表面轧制过程中AISI 304不锈钢表面力学性能和组织的影响

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摘要

The present work integrates 3D digital optical microscopy (OM), nano-indentation, X-ray diffraction (XRD), scanning electron microscopy (SEM) with electron backscatter diffraction (EBSD) and transmission electron microscopy (TEM) to systematically investigate the effect of electropulsing on the surface mechanical properties and microstructure of AISI 304 stainless steel during the ultrasonic surface rolling process (USRP). Compared with the original USRP, the introduction of electropulsing with optimal parameters can effectively facilitate surface crack healing and improve surface hardness and wear resistance dramatically, and the residual compressive stress is further enhanced. Meanwhile, more mar-tensite phase and fewer deformation twins can be found in the strengthened layer. Rapid improvement of the surface mechanical properties should be attributed to the ultra-refined grains, accelerated mar-tensitic phase transformation and suppressed deformation twining induced by the coupling effect of USRP and electropulsing. The high strain rate given by USRP, increased stacking fault energy and accelerated dislocation mobility caused by electropulsing are likely the primary intrinsic reasons for the observed phenomena.
机译：本工作将3D数字光学显微镜（OM），纳米压痕，X射线衍射（XRD），扫描电子显微镜（SEM）与电子背散射衍射（EBSD）和透射电子显微镜（TEM）集成在一起，以系统地研究在超声表面轧制过程（USRP）中，电脉冲对AISI 304不锈钢的表面力学性能和显微组织产生影响。与最初的USRP相比，引入具有最佳参数的电脉冲可以有效地促进表面裂纹的愈合，并显着提高表面硬度和耐磨性，并且残余压应力会进一步提高。同时，在强化层中可以发现更多的马氏体相和更少的形变孪晶。表面机械性能的快速改善应归因于超细晶粒，加速的马氏体相变和抑制的因USRP和电脉冲的耦合效应引起的形变孪生。 USRP产生的高应变率，堆垛层错能量的增加和电脉冲引起的位错迁移率的加速可能是观察到现象的主要内在原因。

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