20MnCrNi2Mo钢贝氏体回火转变  

Bainite tempering transformation of 20MnCrNi2Mo steel

作　　者：侯敬超[1] 计云萍[1] 靳晓燕[1] 任慧平[1,2] 

机构地区：[1]内蒙古科技大学材料与冶金学院,内蒙古包头014010 [2]内蒙古自治区白云鄂博矿多金属资源综合利用重点实验室,内蒙古包头014010

出　　处：《金属热处理》2015年第6期31-34,共4页Heat Treatment of Metals

基　　金：国家自然科学基金(51261018);内蒙古自然科学基金(2012MS0805);内蒙古科技大学创新基金(2011NCL037)

摘　　要：采用扫描电镜、透射电镜和洛氏硬度计研究了20MnCrNi2Mo钢贝氏体的回火转变过程。结果表明,20MnCrNi2Mo钢粒状贝氏体在200℃回火时,M/A岛基本没有发生分解;随回火温度的升高,M/A岛逐渐发生分解,在500℃回火时M/A岛大量分解,位错密度降低,且有碳化物析出。200~500℃回火时硬度变化不大,当回火温度高于500℃时,M/A岛完全分解,析出碳化物聚集长大,硬度值急剧降低。Bainite tempering transformation of 20MnCrNi2Mo steel was investigated by Rockwell hardness tester, scanning electron microscope and transmission electron microscope. The results show that when the granular bainite of 20MnCrNi2Mo steel is tempered at 200 ℃, the decomposition of M/A islands are not happened basically. M/A islands decompose gradually with the increase of tempering temperature. When tempered at 500 ℃, a lot of M/A islands decompose, the dislocation density decreases and the carbides precipitate. When tempered at the range of 200-500 ℃, the change of hardness is not obvious. The hardness decreases sharply when the tempering temperature is higher than 500 ℃ because of complete decomposition of M/A islands and growing up of carbides.

关 键 词：20MnCrNi2Mo钢 贝氏体 回火 M/A岛 硬度 

分 类 号：TG142.1[一般工业技术—材料科学与工程] TG156.5[金属学及工艺—金属材料]