摘要
借助光学显微镜、扫描电镜、透射电镜、拉伸试验机、冲击试验机等研究了热处理工艺对新型中碳合金钢42CrMo4M组织性能的影响。结果表明,经800~900℃淬火油冷后,42CrMo4M钢的淬火态组织主要为板条马氏体,且随着淬火温度的升高,晶粒尺寸逐渐增大,马氏体板条粗化,在860℃淬火时,晶粒度均匀且硬度最高。经860℃淬火后,在580~700℃回火温度范围内,随着回火温度的升高,42CrMo4M钢中的碳化物由长条状向球形转化,并由马氏体边界处不均匀分布演变为基体中弥散分布;当回火温度达到700℃时,42CrMo4M钢中碳化物明显粗化;随着回火温度的升高,42CrMo4M钢的强度先升高后降低,-20℃低温冲击吸收能量先增大后减小。680℃回火时,42CrMo4M钢的冲击吸收能量达到峰值,为99 J。在试验条件下,42CrMo4M钢经860℃淬火及660~680℃回火后具有良好的综合力学性能。
Effect of heat treatment process on microstructure and mechanical properties of a new medium carbon alloy steel 42 CrMo4 M was studied by means of optical microscope, scanning electron microscopy, transmission electron microscopy, tensile testing machine and impact testing machine. The results show that after quenching at 800-900 ℃ and oil cooling, the quenched microstructure of the 42 CrMo4 M steel is mainly lath martensite, and with the increase of quenching temperature, the grain size gradually increases and the martensite lath coarsens. When quenched at 860 ℃, the grain size is uniform and the hardness is the highest. After quenching at 860 ℃, in the tempering temperature range of 580-700 ℃, with the increase of tempering temperature, the carbides in the 42 CrMo4 M steel change from long strip to spherical, and from uneven distribution at the boundary of martensite to dispersed distribution in the matrix. When the tempering temperature reaches 700 ℃, the carbides in the 42 CrMo4 M steel are obviously coarsened. With the increase of tempering temperature, the strength and the low-temperature impact absorbed energy at-20 ℃ of the 42 CrMo4 M steel first increase and then decrease. When tempered at 680 ℃, the impact absorbed energy of the 42 CrMo4 M steel reaches the peak value, which is 99 J. Under the test conditions, the 42 CrMo4 M steel has good comprehensive mechanical properties after quenching at 860 ℃ and tempering at 660-680 ℃.
作者
邢嘉倪
蔡欣
郑雷刚
胡小强
王秀梅
XING Jia-ni;CAI Xin;ZHENG Lei-gang;HU Xiao-qiang;WANG Xiu-mei(School of Materials Science and Engineering,Shenyang Jianzhu University,Shenyang 110168,China;Shenyang National Research Center for Materials Science,Institute of Metals,Chinese Academy of Sciences,Shenyang 110016,China)
出处
《材料热处理学报》
CAS
CSCD
北大核心
2022年第5期124-133,共10页
Transactions of Materials and Heat Treatment
基金
国家重点研发计划(2020YFB2006800)
江西省重大科技专项(20194ABC28011)
扬州市邗江区科技项目(HJZ2020003)
福建省STS计划配套项目(2021T3019)
辽宁省教育厅项目(Injc202016)。
关键词
新型中碳合金钢42CrMo4M
淬火温度
回火温度
力学性能
微观组织
new medium carbon alloy steel 42CrMo4M
quenching temperature
tempering temperature
mechanical property
microstructure