淬火温度对N63钢组织和力学性能的影响  

Effect of quenching temperature on microstructure and mechanical properties of N63 steel

作　　者：张海峰[1,2] 杨豪[3] 韩顺 厉勇[2] 王春旭[2] 吴波[1] ZHANG Hai-feng;YANG Hao;HAN Shun;LI Yong;WANG Chun-xu;WU Bo(School of Advance Manufacturing,Fuzhou University,Jinjiang 362200,China;Institute of Special Steels,Central Iron and Steel Research Institute Co Ltd,Beijing 100081,China;Chongqing Science and Technology Innovation Center of Northwest Polytechnic University,Chongqing 401120,China)

机构地区：[1]福州大学先进制造学院,福建晋江362200 [2]钢铁研究总院有限公司特殊钢研究院,北京100081 [3]西北工业大学重庆科创中心,重庆401120

出　　处：《材料热处理学报》2023年第5期145-151,共7页Transactions of Materials and Heat Treatment

基　　金：国家重点研发计划(2022YFB3705202)。

摘　　要：采用扫描电镜(SEM)、能谱仪(EDS)、透射电镜(TEM)和X射线衍射(XRD)等研究了淬火温度对N63钢组织及性能的影响。结果表明:当淬火温度低于1050℃时,N63钢中观察到M_(23)C_(6)型未溶相;随淬火温度升高,N63钢中未溶相逐渐溶解,晶粒有长大趋势;N63钢在900~1150℃范围内淬火时(淬火后还进行了深冷及回火处理),随着淬火温度的升高,其抗拉强度先升高后降低,在1000℃淬火时达到峰值,为1479 MPa,屈服强度整体上呈降低趋势,在950℃淬火时达到峰值,为1209 MPa,冲击吸收能量先升高后略有降低,在1100℃淬火时达到峰值,为148 J。N63钢在1100℃淬火及深冷和回火处理后,碳化物完全溶解且组织完全奥氏体化,具有最佳的强韧性匹配,其抗拉强度为1470 MPa、屈服强度为1136 MPa,冲击吸收能量为148 J。Effect of quenching temperature on microstructure and properties of N63 steel was studied by means of scanning electron microscopy(SEM),energy dispersive spectrometer(EDS)analysis,transmission electron microscopy(TEM)and X-ray diffraction(XRD).The results show that when the quenching temperature is lower than 1050℃,M_(23)C_(6)type undissolved phase is observed in the N63 steel.With the increase of quenching temperature,the undissolved phase in the N63 steel gradually dissolves and the grain tends to grow.When the N63 steel is quenched in the temperature range of 900-1150℃(after quenching,it is also subject to cryogenic and tempering treatment),with the increase of quenching temperature,its tensile strength first increases and then decreases,reaching a peak value of 1479 MPa when quenched at 1000℃,and the yield strength generally decreases,reaching a peak value of 1209 MPa when quenched at 950℃,and the impact absorbed energy first increases and then decreases slightly,reaching a peak value of 148 J when quenched at 1100℃.After quenching at 1100℃and cryogenic and tempering treatment,the carbides of the N63 steel are completely dissolved and the microstructure is completely austenitized,which has the best matching of strength and toughness,with the tensile strength of 1470 MPa,yield strength of 1136 MPa,and impact absorbed energy of 148 J.

关 键 词：N63钢 淬火处理 力学性能 微观组织 M_(23)C_(6) 

分 类 号：TG142.2[一般工业技术—材料科学与工程]