Effect of Pre-Deforming on Plasma Nitriding Properties of Austenitic Stainless Steel
This paper reports a study on the effect of a modified layer caused by pre-deforming on the low temperature plasma nitriding of AISI 304 austenitic stainless steel. The aim of using the deformed layer is to produce a thicker nitrided layer and to decrease the nitriding temperature due to the much faster diffusion of nitrogen. The pre-deformed sample was prepared by the rolling in 0, 1, 2, 3, and 4％ ratios. Plasma nitriding was carried out at 673 and 723 K. For 18 ks under 600 Pa pressures in presence of N2 : H2 in 50 : 50 ratio. The microhardness, thickness and phase composition of nitrided layers formed on the surface of pre-treated and non-treated samples were investigated using Vickers microhardness tester, optical microscope and X-ray diffraction techniques, respectively. After nitriding, maximum hardness ～1150 HV was achieved on the pre-deformed sample. XRD pattern showed that most dominant phase of the nitrided layer consisted of the expanded austenite (S phase). In addition, the pre-deforming by the rolling had a great influence on the hardness and thickness of the S phase. That is, the hardness and thickness of the S phase increased by applying the pre-deforming.
plasma nitriding pre-deforming rolling S phase stainless steel surface engineering
Akio Nishimoto Katsuya Akamatsu
Department of Chemistry and Materials Engineering,Kansai University,Osaka,Japan
国际会议
The Fourth Asian Conference on Heat Treatment and Surface Engineering(第四届亚洲热处理及表面工程大会)
北京
英文
364-367
2009-10-27（万方平台首次上网日期，不代表论文的发表时间）