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.
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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