Transactions of Materials and Heat Treatment

Title：Twinning behavior of 316L stainless steel powder for decoration during high velocity compaction forming process

Authors： Ma Chunyu Chen Xiangping Xiao Zhiyu Yuan Junping

Unit： Guangzhou Panyu Polytechnic South China University of Technology

KeyWords： 316L stainless steel powder high velocity compaction twin corrosion resistance property impact momentum

ClassificationCode：TG144

year,vol(issue):pagenumber：2022,47(8):130-137

Abstract：

For 316L stainless steel powder, the influence laws of impact momentum on densification and twinning behaviors and the influence law of twinning behavior on corrosion resistance property were investigated by density test, scanning electron microscope (SEM), metallographic structure, transmission electron microscope (TEM), selected area electron diffraction (SAED) and electrochemical test. The results show that lower impact momentum can obtain higher density under lower impact energy(192，300 and 588 J), and higher impact momentum can obtain higher density under higher impact energy(972 and 1554 J). Regardless of impact energy or impact momentum, the twin structure can be observed in 316L stainless steel powder during high velocity compaction process, and when the crystal zone axis is ［1 1 4］, the twin plane is（2 2 0），and higher impact energy can lead to higher twin density. Under lower impact energy, lower impact momentum can lead to twin structure with higher density, and under higher impact energy, higher impact momentum can lead to twin structure with higher density. In addition, density is an important factor affecting the corrosion resistance performance, and the lower the density is, the worse the corrosion resistance property is. However, under the premise of similar densities, the hgiher twin density not only helps to improve the corrosion resistance property, but also effectively reduces the corrosion rate.

Funds：

2020年广东省普通高校特色创新项目（2020KTSCX282）；广东省教育科学规划课题（2021GXJK568）；广州市基础与应用基础研究项目（202102080149）;广州市基础与应用基础研究项目（202201011851)

作者简介：马春宇（1981-），男，硕士，副教授，E-mail：18457725@qq.com；通信作者：陈湘平（1974-），女，博士，高级工程师，E-mail：376254686@qq.com

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