Li Kejian, Chen Dengming, Cao Pengjun, Cao Xianlong, Shin Keesam
School of Metallurgy and Materials Engineering, Chongqing University of Science & Technology, Chongqing 401331, China.
J Nanosci Nanotechnol. 2019 Jul 1;19(7):4078-4082. doi: 10.1166/jnn.2019.16149.
A popular issue of recent scientific research is the surface modification induced by plastic deformation, such as ultrasonic shot peening (USP) on workpiece surface. USP is an efficient way to improve the mechanical behavior of specimens by inducing severe plastic deformation on their surface. Nevertheless, this surface treatment induced complex microstructural evolutions, such as grain refinement and phase transformation. In this work, the microstructure and properties of 347 austenite steel samples before and after USP for 5, 10, and 15 min treatments have been investigated. The affected layers show a significant hardness increase (~450 m in depth) on the USP treated surface, and the 10 min USP treated specimen shows the best corrosion resistance in all tested specimens. The magnetic properties and microstructures of the tested specimens show gradient evolution during deformation.
近期科学研究的一个热门问题是塑性变形引起的表面改性，例如在工件表面进行超声喷丸处理（USP）。USP是一种通过在试样表面诱导严重塑性变形来改善其力学性能的有效方法。然而，这种表面处理会引起复杂的微观结构演变，如晶粒细化和相变。在这项工作中，研究了347奥氏体钢试样在进行5、10和15分钟USP处理前后的微观结构和性能。受影响层在USP处理过的表面显示出显著的硬度增加（深度约450微米），并且在所有测试试样中，经10分钟USP处理的试样显示出最佳的耐腐蚀性。测试试样的磁性和微观结构在变形过程中呈现出梯度演变。
