摘要
分别在300℃和450℃下对淬火态M50钢进行了碳分配处理,并利用X射线衍射仪（XRD）、扫描电镜（SEM）及透射电镜（TEM）对碳分配后试样进行观察分析,研究传统Q-T（淬火-回火）和新型Q-P-T（淬火-碳分配-回火）热处理工艺对M50钢性能的影响。结果表明：经碳分配后M50钢中残留奥氏体的碳含量由淬火态的0.64 mass%,最高升至1.20 mass%（300℃,30 min）及1.10 mass%（450℃,0.5 min）;不同温度下,随着保温时间的延长,残留奥氏体的碳含量降低;碳分配时M50钢中存在碳化物的析出,随着时间的延长,碳化物析出量逐渐增加,碳分配过程中析出的碳化物为Fe3C;新型Q-P-T热处理工艺可以在保证M50钢强度的前提下,将其冲击吸收功提高90%以上。
The carbon partitioning process of quenched M50 steel was carried out at 300℃ and 450 ℃, respectively. The effects of traditional Q-T （quenching-tempering） and new Q-P-T （quenching- partitioning-tempering） processes on microstructure and properties of the M50 steel were studied by means of X-ray diffraction （XRD） , scanning electron microscopy （SEM） and transmission electron microscopy （TEM）. The results show that the highest carbon content of retained austenite in partitioned M50 steel increases from 0. 64 mass % （as-quenched） to 1.20 mass% （carbon partitioning treated at 300 ℃ for 30 min） and 1. 10 mass% （carbon partitioning treated at 450℃ for 0.5 min）. However, the carbon content of retained austenite decreases with the increasing of the holding time at different temperatures. The precipitation of carbides is observed in the M50 steel during the partitioning process, and the amount of carbides precipitation increases gradually with the increasing of the holding time, and the precipitated carbides are Fe3C. The impact absorption energy of the M50 steel can be increased more than 90% by new Q-P-T process on the premise of ensuring the strength.
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2018年第1期77-83,共7页
Transactions of Materials and Heat Treatment
基金
国家高技术研究发展(“863”项目)计划(2015AA034303)
黑龙江省应用技术研究与开发计划
国家项目省级资助(GX16A004)
关键词
M50钢
残留奥氏体
碳分配
MSO steel
retained austenite
carbon partitioning
