回火温度对3Cr3Mo2NiW钢力学性能和断口形貌的影响  

Effect of tempering temperature on mechanical properties and fracture morphology of 3Cr3Mo2NiW steel

作　　者：李璞 魏世忠[1,2] 张程 王晓东[1,2] 罗成 Li Pu;Wei Shizhong;Zhang Cheng;Wang Xiaodong;Luo Cheng(School of Materials Science and Engineering,Henan University of Science and Technology,Luoyang Henan 471003,China;National Joint Engineering Research Center for Abrasion Control and Molding of Metal Materials,Henan University of Science and Technology,Luoyang Henan 471003,China;School of Mechanical Engineering,Yangtze University,Jinzhou Hubei 434023,China)

机构地区：[1]河南科技大学材料科学与工程学院,河南洛阳471003 [2]河南科技大学金属材料磨损控制与成型技术国家地方联合工程研究中心,河南洛阳471003 [3]长江大学机械工程学院,湖北荆州434023

出　　处：《金属热处理》2020年第6期22-27,共6页Heat Treatment of Metals

基　　金：特种工况用高强韧高耐磨Cr-Mo-V钢的研究(182102210043);高强韧Cr-Ni-Mo钢的耐热耐磨机理研究(HKDNM201809)。

摘　　要：研究了3Cr3Mo2NiW钢力学性能和断口形貌随回火温度的变化。结果显示,随着回火温度的升高,试验钢的硬度降低,韧性增加,550℃回火时出现二次硬化现象;600℃以上回火,硬度明显降低,韧性大幅度增加;700℃回火态试样未冲断。淬火后,随着回火温度的升高,试验钢的基体组织逐渐转变为回火马氏体、回火屈氏体和回火索氏体。300~600℃温度区间内回火试样的断裂方式为准解理断裂,高温回火试样的断裂方式为韧性断裂,不同温度回火后得到的显微组织和碳化物对试样的冲击韧性有较大影响。The changes of mechanical properties and fracture morphology of 3Cr3Mo2NiW steel with tempering temperature were studied.The results show that with the increase of tempering temperature,the hardness of the experimental steel decreases,the toughness increases,and the secondary hardening occurs when tempered at 550℃.When the tempering temperature being above 600℃,the hardness decreases significantly,and the toughness increases greatly.The impact tested specimen tempered at 700℃is not broken completely.After water quenching,the matrix structure gradually transforms into tempered martensite,tempered troostite and tempered sorbite as the tempering temperature increases.The fracture mode of tempered specimens in the temperature range of 300℃to 600℃is quasi-cleavage fracture,and the fracture mode of high temperature tempered specimen is ductile fracture.The microstructure and carbides obtained by tempering at different temperatures have a great influence on the impact toughness.

关 键 词：3Cr3Mo2NiW钢 回火温度 力学性能 断口形貌 断裂方式 

分 类 号：TG142.1[一般工业技术—材料科学与工程] TG115.5+6[金属学及工艺—金属材料]