摘要
制定了两种不同的热处理工艺,研究18Cr2Ni4WA钢真空渗碳后回火、淬火和深冷工艺对材料组织和性能的影响。结果表明,18Cr2Ni4WA钢渗碳后,经高温回火、淬火、深冷和低温回火处理后,渗碳层深度几乎不受影响,表面残留奥氏体含量显著降低。经680℃×5 h两次高温回火+860℃淬火+-115.3℃深冷+160℃低温回火工艺处理后,试样表面硬度为64.2 HRC,渗碳层深度为0.86 mm;并得到由针状回火马氏体、少量残留奥氏体和弥散分布的点状碳化物组成的渗碳层组织和由低碳板条状回火马氏体组成的心部组织,不仅使得表面获得高硬度,同时保证了心部的强韧性。
Two different heat treatment processes were conducted to investigate the impact of tempering , quenching and cryogenic process on microstructure and properties of 18Cr2Ni4WA steel after vacuum carburizing .The result shows that after high temperature tempering , quenching , cryogenic and low temperature tempering , the depth of carburized layer is almost not affected and the content of retained austenite on surface is reduced significantly .After 680 ℃×5 h twice tempering +860 ℃ quenching +-115 .3 ℃cryogenic treatment +160 ℃tempering, the surface hardness and the depth of carburized layer is 64.2 HRC and is 0.86 mm respectively, and the microstructure of the carburized layer is composed of acicular tempered martensite , less refined martensite and fine granular dispersed carbides , the microstructure of the core is lath-like tempered martensite , which results in higher surface hardness and good combination of strength and toughness of the core .
出处
《金属热处理》
CAS
CSCD
北大核心
2014年第9期32-35,共4页
Heat Treatment of Metals
基金
国家重点基础研究发展计划"机械装备再制造的基础科学问题"(2011CB013404)的资助
关键词
18CR2NI4WA钢
真空渗碳
热处理工艺
组织
性能
18Cr2Ni4WA steel
vacuum carburizing
heat treatment process
microstructure
mechanical properties
