30CrMo钢Q-P-T及深冷处理后的组织与性能  

Microstructure and properties of 30CrMo steel after Q-P-T and cryogenic treatment

作　　者：王葛 刘胜强 郭伟 李怀欣 韩大阔 李志广 李强[3] WANG Ge;LIU Sheng-qiang;GUO Wei;LI Huai-xin;HAN Da-kuo;LI Zhi-guang;LI Qiang(National Engineering Research Center for Equipment and Technology of Cold Strip Rolling,Yanshan University,Qinhuangdao 066004,China;Zhongxin daika Co Ltd,Qinhuangdao 066004,China;College of Materials Science and Engineering,Hebei University of Technology,Tianjin 300401,China)

机构地区：[1]燕山大学国家冷轧板带装备及工艺工程技术研究中心,河北秦皇岛066004 [2]中信戴卡股份有限公司,河北秦皇岛066004 [3]河北工业大学材料科学与工程学院,天津300401

出　　处：《材料热处理学报》2020年第4期83-91,共9页Transactions of Materials and Heat Treatment

基　　金：河北省自然科学基金(E2016203119)。

摘　　要：利用光学显微镜(OM),扫描电镜(SEM),X射线衍射仪(XRD)和力学性能测试等研究了不同深冷处理工艺对经Q-P-T工艺处理后30CrMo钢组织和力学性能的影响。结果表明,30CrMo钢最佳的Q-P-T+深冷工艺为:260℃淬火温度,400℃碳配分温度、60 s碳配分时间、-100℃深冷温度、1 h深冷保温时间和一次深冷。经最优的Q-P-T+深冷工艺处理后,30CrMo钢的碳化物的平均尺寸较小,残留奥氏体含量明显增加,残留奥氏体的体积分数约为7.9%,显微硬度约为482 HV,抗拉强度约为1629 MPa,强塑积约为20525 MPa·%,伸长率约为12.6%,其综合力学性能得到了较大幅度提高。The effects of different cryogenic treatment on microstructure and mechanical properties of 30 CrMo steel treated by Q-P-T process were studied by means of optical microscope(OM), scanning electron microscopy(SEM), X-ray diffractometer(XRD) and mechanical properties test. The results show that the optimum Q-P-T and cryogenic process of the 30 CrMo steel is as follows: quenching temperature of 260 ℃, carbon distribution temperature of 400 ℃, carbon distribution time of 60 s, cryogenic temperature of-100 ℃, cryogenic holding time of 1 h and cryogenic treatment for one time. After the optimal Q-P-T and cryogenic process, the average carbide size of the 30 CrMo steel is small, the retained austenite content is obviously increased, the volume fraction of retained austenite is about 7.9%, the microhardness is about 482 HV, the tensile strength is about 1629 MPa, the product of strength and elongation is about 20525 MPa·%, the elongation is about 12.6%, which shows that the comprehensive mechanical properties of the 30 CrMo steel have been greatly improved.

关 键 词：30CRMO钢 Q-P-T工艺 深冷处理 残留奥氏体 强塑积 

分 类 号：TG142.3[一般工业技术—材料科学与工程]