简介概要

Research on Mediate Temperature Decomposition of High Nitrogen Austenite

来源期刊:材料热处理学报2004年第5期

论文作者:HU Ming-juan LI Xiao-ling BEI Duo-hui ZHU Zu-chang

关键词:high nitrogen austenite; mediate temperature decomposition; γ-Fe4N; TEM; micro-hardness;

摘    要:The decomposed products from high nitrogen austenite aging at 225℃ were investigated by TEM. It is found that the shape of decomposition products inside the austenite grains is not regular and not strictly oriented. Preferential nucleation of γ-Fe4N at dislocations and grain boundaries has been observed. It also has been found that during the first stage of the high nitrogen austenite decomposition a large quantity of ultra-fine γ-Fe4N precipitate inside the parent austenite, which has been thought to be the undecomposed region before. The ultimate products are composed of highly dispersed α-Fe and γ-Fe4N, with both of them maintaining nanometer scale. The micro-hardness of them can be as high as900HV.

详情信息展示

Research on Mediate Temperature Decomposition of High Nitrogen Austenite

HU Ming-juan1,LI Xiao-ling1,BEI Duo-hui1,ZHU Zu-chang1

(1.School of Material Science and Engineering, Shanghai Jiao Tong University, Shanghai, China)

摘要:The decomposed products from high nitrogen austenite aging at 225℃ were investigated by TEM. It is found that the shape of decomposition products inside the austenite grains is not regular and not strictly oriented. Preferential nucleation of γ-Fe4N at dislocations and grain boundaries has been observed. It also has been found that during the first stage of the high nitrogen austenite decomposition a large quantity of ultra-fine γ-Fe4N precipitate inside the parent austenite, which has been thought to be the undecomposed region before. The ultimate products are composed of highly dispersed α-Fe and γ-Fe4N, with both of them maintaining nanometer scale. The micro-hardness of them can be as high as900HV.

关键词:high nitrogen austenite; mediate temperature decomposition; γ-Fe4N; TEM; micro-hardness;

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