化学热处理工艺对UNIMAX钢渗氮层组织性能演变规律的影响  

Study on Evolution Law of Microstructure and Properties of UNIMAX Steel During Ion Nitriding at Different Temperatures

作　　者：曹文峰 贺瑞军[1] 王晓颖 周舸 田野[1] Cao Wenfeng;He Ruijun;Wang Xiaoying;Zhou Ge;Tian Ye(Beijing Institute of Aeronautical Materials,Beijing,100095;School of Materials Science and Engineering,Shenyang University of Technology,Liaoning,110870)

机构地区：[1]北京航空材料研究院,北京100095 [2]沈阳工业大学材料科学与工程学院,辽宁110870

出　　处：《当代化工研究》2022年第20期129-131,共3页Modern Chemical Research

摘　　要：在压力为250Pa,渗氮时间为20h的不同渗氮温度下,对UNIMAX钢进行了离子渗氮实验。采用显微硬度计、显微维氏硬度计、金相显微镜、X射线衍射仪对上述不同离子渗氮处理后的渗氮层表面硬度、渗层深度、渗层组织、渗层物相组成、表面残余应力、表面脆性进行了表征与分析。结果表明,随着渗氮温度的提高,渗层深度逐渐增大,渗层中脆性相ε-Fe_(2.3)N相对含量下降,韧性相γ’-Fe_(4)N相对含量提高。在实验研究的温度范围内,渗氮温度不高于520℃时,可以获得韧性较好的表面渗氮层。其中,在渗氮温度为500℃时,可以获得渗层深度与表面力学性能的最佳匹配。Ion nitriding of UNIMAX steel was conducted at different atmosphere under 20 h,250 Pa in vacuum ion nitriding furnace to study the influence of temperature on nitrided layer.The nitrided specimens were characterized by microhardness tester,Vickers microhardness tester,optical microscope,X-ray diffraction (XRD) were used to analyze and study the surface hardness,depth,microstructure,phase composition and surface brittleness of nitrided layer after ion nitriding treatment.The results show that with the increase of temperature,the depth of nitriding layer increases.At the same time,ε-Fe_(2.3)N content decreases and γ’-Fe_(4)N content increases with temperature increasing.The nitrided layer with good toughness can be obtained when temperature is less than or equal to 520 ℃ within the temperature range of the experiment.The optimal layer performance can be obtained when temperature is 500 ℃.

关 键 词：UNIMAX钢 离子渗氮 表面硬度 渗层深度 渗层性能 

分 类 号：TG174.44[金属学及工艺—金属表面处理]