淬火温度对中锰Q&P钢组织与性能的影响  

Effect of quenching temperature on microstructure and properties of medium-manganese Q&P steel

作　　者：吝章国[1,2] 唐荻[1] 江海涛[1] 段晓鸽[1] 吴彦欣[3] Lin Zhangguo Tang Di Jiang Haitao Duan Xiaoge Wu Yanxin(Engineering Research Institute, University of Science and Technology Beijing, Beijing 100083 Hebei Iron＆steel Technology Research Institute, Shijiazhuang Hebei 052165, China School of Material Science and Engineering, Shanghai University, Shanghai 200072, China)

机构地区：[1]北京科技大学冶金工程研究院,北京100083 [2]河北钢铁技术研究总院,河北石家庄052165 [3]上海大学材料科学与工程学院,上海200072

出　　处：《金属热处理》2016年第10期123-127,共5页Heat Treatment of Metals

基　　金：中央高校基本科研业务费专项(FRF-TP-11-005B)

摘　　要：利用连续退火模拟试验机对两种含Nb中锰钢进行Q&P热处理试验,通过SEM、EBSD、拉伸试验及X射线衍射法研究了不同淬火温度对含Nb中锰Q&P钢组织性能的影响。结果表明:淬火温度通过影响初生马氏体量进而影响最终室温奥氏体含量,其中对5Mn钢的影响低于7Mn钢。当淬火温度为180℃时,5Mn-Nb钢获得的最大抗拉强度可达1041 MPa,伸长率为34.9%,强塑积可达36 000 MPa·%;7Mn-Nb钢在淬火温度为60℃的Q&P工艺处理下获得的最大抗拉强度可达1245 MPa,伸长率为32.4%,强塑积可达40 338 MPa·%。The Q＆P （quenching and partitioning） process of two kinds of Nb-bearing medium-manganese steel was carried out using a thermo-mechanical simulator CCT-AY-U. Effect of various quenching temperature on microstructure and mechanical properties of these experimental steel was investigated by means of scan electron microscope （ SEM ）, electron backscattered diffraction （ EBSD ）, tensile test and X-ray diffraction （ XRD）, respectively. The results indicate that quenching temperature influences the retained austenite content at room temperature by controlling the content of primary martensite, while the effect on 5wt. % Mn steel is less than 7wt. % Mn steel. After quenching at 180℃ , 5Mn-Nb steel exhibits a maximum tensile strength of 1041 MPa with an elongation of 34.9% and the product of strength and ductility of the experimental steel could reach up to 36 000 MPa · %. After quenching at 60 ℃, 7Mn-Nb steel shows an maximum tensile strength of 1245 MPa, with an elongation of 32.4% and the product of strength and ductility of the experimental steel could reach up to 40 338 MPa · %.

关 键 词：中锰钢 Q&P工艺 淬火温度 组织性能 残留奥氏体 

分 类 号：TG335.5[金属学及工艺—金属压力加工]