Nitrogenation during ball milling of stainless steel

被引：4

作者：

Calka, A ^{[1
]}

Wexler, D ^{[1
]}

Zhou, J ^{[1
]}

Dunne, D ^{[1
]}

机构：

[1] Univ Wollongong, Dept Engn Mech, Wollongong, NSW 2500, Australia

来源：

MECHANICALLY ALLOYED, METASTABLE AND NANOCRYSTALLINE MATERIALS, PART 1 | 1998年 / 269-2卷

关键词：

reactive ball milling; mechanical grinding; stainless steel; steel milling; steel nitrogenation; iron nitrides; chromium nitrides; nitrides stability; nanostructural materials; martensite;

D O I：

10.4028/www.scientific.net/MSF.269-272.265

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Reactive ball milling, using the magneto-mechano-chemical method, was performed on type 304 stainless steel powder in order to investigate structural development and nitrogenation. Experiments were performed in argon, nitrogen and ammonia gases. The allotropic transformation from austenite to ferrite or martensite, which was believed to be stress induced, occurred after milling in all three gases with the reverse transformation occurring after longer milling times. Milling in both nitrogen and ammonia resulted in nitrogenation of the stainless steel powder, in the case of ammonia to higher levels (greater than 7 wt. %) than those achieved using conventional high-pressure-hi gh-temperature diffusion processing. Rapid uptake of N during milling in ammonia is associated with formation of Fe3N. Annealing of nitrided powders at 1000 degrees C resulted in precipitation of the phases in the following order with increasing nitrogen concentration; beta-Cr2N, beta-Cr2N+CrN and CrN.

引用

页码：265 / 270

页数：6