回火温度对40CrMoVNbTi钢组织和性能的影响  

Effect of tempering temperature on microstructure and properties of 40CrMoVNbTi steel

作　　者：孙永真 程巨强[1] 赵翛涵 Sun Yongzhen;Cheng Juqiang;Zhao Xiaohan(College of Materials Science and Chemical Engineering,Xi'an Technological University,Xi'an Shaanxi 710021,China)

机构地区：[1]西安工业大学材料与化工学院,陕西西安710021

出　　处：《金属热处理》2023年第1期193-197,共5页Heat Treatment of Metals

摘　　要：采用780℃亚温淬火和不同温度回火,探究回火温度对40CrMoVNbTi钢组织和力学性能的影响。对淬火不同温度回火40CrMoVNbTi钢的力学性能变化及显微组织和冲击断口断貌进行观察和分析。结果表明,780℃亚温淬火,随回火温度的提高,40CrMoVNbTi钢的强度下降,塑性呈上升趋势,300℃回火冲击吸收能量值最低,出现回火脆性。200℃回火组织为回火马氏体和残留奥氏体,其抗拉强度为2150 MPa,KV2为23.8 J;550~600℃回火组织为回火索氏体,韧性较好,其抗拉强度为1190~1070 MPa,KV2为94~123 J,满足AISI 4140钢的力学性能要求,具有较高的冲击性能。Effect of tempering temperature on microstructure and mechanical properties of 40CrMoVNbTi steel was investigated by means of 780 ℃ subcritical quenching and tempering at different temperatures. The mechanical properties, microstructure and impact fracture of the 40CrMoVNbTi steel tempered at different temperatures were observed and analyzed. The test results show that the strength decreases and the plastic index increases with the increase of tempering temperature, and the impact absorbed energy value tempered at 300 ℃ is the lowest and the temper brittleness occurs. The tensile strength of the 40CrMoVNbTi steel tempered at 200 ℃ is 2150 MPa and KV2is 23.8 J. When tempered at 550-600 ℃,the microstructure of the 40CrMoVNbTi steel is tempered sorbite, the tensile strength is 1190-1070 MPa and KV2is 94-123 J, and the mechanical properties can meet the requirements of AISI 4140 steel and have a high impact property.

关 键 词：40CrMoVNbTi钢 回火温度 组织与性能 

分 类 号：TG142.1[一般工业技术—材料科学与工程]