30CrMnSi2Mo钢在M_(s)点之下的等温转变组织及性能  

Microstructures and mechanical properties of 30CrMnSi2Mo steel transformed below M_(s) temperature

作　　者：杨姗姗 贾礼 段宝玉[1] 范秀风[1] 高占勇[1] YANG Shanshan;JIA Li;DUAN Baoyu;FAN Xiufeng;GAO Zhanyong(Materials and Metallurgy School, Inner Mongolia University of Science and Technology, Baotou 014010, China;Zibo Baotou-Steel Lingzhi Rare Earth High Technology Co.,Ltd., Zibo 255400, China;Erdos Shendong Tianlong Mining Machinery Equipment Co., Ltd., Erdos 017200, China)

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]淄博包钢灵芝稀土高科技股份有限公司,山东淄博255400 [3]鄂尔多斯市神东天隆矿山机械设备有限公司,内蒙古鄂尔多斯017200

出　　处：《内蒙古科技大学学报》2021年第3期235-239,共5页Journal of Inner Mongolia University of Science and Technology

基　　金：内蒙古自治区应用技术研究与开发计划基金资助项目(201802022);鄂尔多斯市科技计划项目;内蒙古包钢钢联股份合作开发项目.

摘　　要：运用热膨胀法测定了30CrMnSi2Mo钢马氏体转变动力学,并运用TEM及FEG-SEM分析等温淬火后的组织特征.结果表明:在M_(s)点之下等温转变时先发生马氏体转变,等温组织为回火马氏体及贝氏体整合组织,先形成马氏体转变量与等温温度存在定性关系.试验钢在260℃等温时得到良好的强韧性配合,这与先形成马氏体细化低温贝氏体组织有关.The Martensite transformation dynamics of 30CrMnSi2Mo steel was measured by dilatometer.The isothermal temperature tempered microstructures were characterised by means of TEM and FEG-SEM.The results show that the microstructures formed below the M_(s) temperature are mainly bainitic,mixed with prior Martensite.There are quantitative relations between the volume fraction of prior martensite and isothermal quenching temperature.The good combination of comprehensive strength and toughness properties of the test steel was obtained at 260℃due to the preformed martensite refining the low temperature bainite.

关 键 词：纳米贝氏体 回火马氏体 残余奥氏体 等温淬火 力学性能 

分 类 号：TG113.2[金属学及工艺—物理冶金]