38CrMoAl钢负压感应快速渗氮工艺及性能  

Negative pressure rapid nitriding process and performance of 38CrMoAl steel under vacuum induction

作　　者：冯治国[1] 郑纪豹 刘静[2] 

机构地区：[1]贵州大学机械工程学院,贵州贵阳550025 [2]贵州师范大学材料与建筑工程学院,贵州贵阳550025

出　　处：《材料热处理学报》2017年第8期128-133,共6页Transactions of Materials and Heat Treatment

基　　金：国家自然科学基金(51574096);贵州省科学技术基金(黔科合LH字[2014]7047号)

摘　　要：利用自主研制的真空感应渗氮装置在38CrMoAl钢表面制备渗氮层,探讨渗氮压力对渗氮层组织与性能的影响,并采用SEM、自动显微硬度测试、滑动干摩擦及电化学极化试验等分析了渗氮硬化层的显微组织、硬度、耐磨性与耐蚀性。结果表明:经渗氮处理后的试样表层平整,白亮层、扩散层、基体之间过渡平缓。随着渗氮压力的上升,渗层厚度增加,渗层硬度、耐磨性先提高后下降,-30 kPa时表面硬度达到1200 HV0.025,耐磨性提高约5倍。The nitrided layer was prepared on the surface of 38 CrMoAl steel by means of a self-made vacuum induction nitriding device,and the effect of nitriding pressure on microstructure and properties of the nitride layer was discussed.The microstructure,hardness,wear resistance and corrosion resistance of the nitrided layer were analyzed by means of SEM,automatic hardness test,sliding dry friction and electrochemical polarization test.The results show that the surface of the sample after the nitriding treatment is even and the transition from the bright layer through diffusion layer to the matrix is smooth.The thickness of the diffusion layer increases while the hardness and wear resistance increase first and then decrease with the incensing of the nitride pressure.The surface hardness of the nitrided layer reaches1200 HV0.025 and the wear resistance increases by about 5 times when the nitriding pressure is-30 kPa.

关 键 词：38CrMoAl 负压 感应渗氮 耐磨性 耐蚀性 

分 类 号：TG156.8[金属学及工艺—热处理]