回火温度对20SiMnMo高强度钢微观组织与力学性能的影响  

Effect of Tempering Temperature on Microstructure and Mechanical Properties of 20SiMnMo High Strength Steel

作　　者：林文政 田荣斌 贾礼 段宝玉[1] 高占勇[1] LIN Wen-zheng;TIAN Rong-bin;JIA Li;DUAN Bao-yu;GAO Zhan-yong(College of Materials and Metallurgy,Inner Mongolia University of Science and Technology,Baotou 014010;Baogang Incorporated Company,Baotou 014010;Erdos City Shendong Tianlong Mining Machine Limited Co,Erdos 017200;Yantai Lubao Steel Pipe Incorporated Company,Yantai 265599)

机构地区：[1]内蒙古科技大学材料与冶金学院,包头014010 [2]包钢钢联股份有限公司,包头014010 [3]鄂尔多斯市神东天隆矿山机械设备有限公司,鄂尔多斯017200 [4]烟台鲁宝钢管有限责任公司,烟台265599

出　　处：《特殊钢》2022年第3期74-78,共5页Special Steel

基　　金：鄂尔多斯市科技计划项目;内蒙古自治区应用技术研究与开发计划项目(201802022)。

摘　　要：采用光学显微镜、扫描电子显微镜、洛氏硬度计、万能力学试验机以及冲击试验机研究了950℃淬火220℃、240℃、260℃、280℃、300℃和320℃3 h回火试验对20SiMnMo高强度钢(/%:0.22C,0.80Si,1.00Mn,0.40Mo,0.72Cr,0.20Ni)微观组织和力学性能的影响。结果表明,随着回火温度的升高,试验钢的硬度、强度不断下降,伸长率、室温冲击功先升高再降低。当260℃回火时,试验钢具有均匀细长的板条马氏体组织,其强塑韧综合力学性能最佳:硬度值44.8HRC、A_(KV2)冲击功75.3 J、抗拉强度1278 MPa、屈服强度1210 MPa、伸长率15.5%。Effect of 220℃,240 ℃,260 ℃,280℃,300 ℃and 320 ℃for 3 h tempering on microstructures and mechanical properties of 950 ℃ quenched test 20 SiMnMo high strength steel(/%:0.22 C,0.80 Si,1.00 Mn,0.40 Mo,0.72 Cr,0.20 Ni)are studied by means of optical microscope,scanning electron microscope,Rockwell hardness tester,universal tensile testing machine and impact testing machine.The results show that with the increase of tempering temperature,the hardness and strength of the tested steel decrease,the elongation and impact energy at room temperature increase firstly and then decrease.After tempered at 260℃,the steel with uniform fine martensite laths microstructure has a good comprehensive properties of strength,ductility and toughness with HRC hardness number 44.8,impact absorption energy A_(KV2)75.3 J,tensile strength 1 278 MPa,yield strength 1 210 MPa and elongation 15.5%.

关 键 词：高强度钢20SiMnMo 回火温度 板条马氏体 力学性能 

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]