回火温度对22SiMnCrNi2Mo钢组织与力学性能的影响  

Influence of tempering temperature on microstructure and mechanical properties of 22SiMnCrNi2Mo steel

作　　者：刘群[1] 欧梅桂[1] 王攀智[1] 熊家泽 龙潜 

机构地区：[1]贵州大学材料与冶金学院,贵州贵阳550025 [2]首钢贵阳特殊钢厂,贵州贵阳550000

出　　处：《金属热处理》2014年第3期49-52,共4页Heat Treatment of Metals

基　　金：贵阳市科技局项目(筑科合同(2012101)2-5号;筑科合同(2012207)03号)

摘　　要：通过显微组织观察、拉伸和冲击试验、硬度测试、残留奥氏体测定和冲击断口形貌分析等，研究了回火温度对22SiMnCrNi2Mo钢组织与性能的影响。结果表明，300℃以下回火时，组织为回火马氏体＋贝氏体＋残留奥氏体；400～500℃回火时，组织为回火屈氏体；600℃时，组织为回火索氏体。随回火温度升高，强度、硬度呈下降趋势，残留奥氏体含量逐渐减少；冲击性能先下降后升高，在400～500℃出现回火脆性，600℃时冲击吸收能量达到最大。综合比较，200℃时强度、硬度和塑韧性配合较好。Effects of tempering temperature on microstructure and mechanical properties of 22SiMnCrNi2Mo steel were investigated by use of microstructure observation , tensile and impact test , hardness measurement , determination of retained austenite and impact fracture analysis . The results show that the microstructure of the steel tempered below 300℃is composed of tempered martensite ＋bainite＋retained austenite , tempered at 400-500 ℃, is tempered troostite and tempered at 600 ℃, is tempered sorbitic .With tempering temperature increasing , the strength and hardness of 22SiMnCrNi2Mo steel reduce gradually , the retained austenite decreases gradually , the impact properties falls first and then rapidly increases .Temper brittleness appears at 400-500 ℃ and impact absorbed energy reaches to maximum at 600 ℃. Comprehensive comparison , the strength, hardness, plasticity and toughness has a better match when tempered at 200 ℃.

关 键 词：22SiMnCrNi2Mo钢 回火温度 组织 力学性能 

分 类 号：TG156.5[金属学及工艺—热处理]