两相区淬火温度对Cr-Mn-Si低合金钢组织及性能的影响  

Effect of intercritical quenching temperature on microstructure and properties of Cr-Mn-Si low alloy steel

作　　者：高鑫 李明东 苏杰[2] 姜庆伟[1] 夏世洪 张永强 宁静[2] Gao Xin;Li Mingdong;Su Jie;Jiang Qingwei;Xia Shihong;Zhang Yongqiang;Ning Jing(Faculty of Materials Science and Engineering,Kunming University of Science and Technology,Kunming Yunnan 650093,China;Research Institute of Special Steels,Central Iron and Steel Research Institute Co.,Ltd.,Beijing 100081,China;NORINCO Group Air Ammunition Research Institute Co.,Ltd,Harbin Heilongjiang 150030,China;Special Metallurgical Products Research Institute,Daye Special Steel Co.,Ltd.,Huangshi Hubei 435001,China)

机构地区：[1]昆明理工大学材料科学与工程学院,云南昆明650093 [2]钢铁研究总院有限公司特殊钢研究院,北京100081 [3]中国兵器工业集团航空弹药研究院有限公司,黑龙江哈尔滨150030 [4]大冶特殊钢有限公司特冶产品研究所,湖北黄石435001

出　　处：《金属热处理》2025年第1期119-125,共7页Heat Treatment of Metals

摘　　要：利用光学显微镜(OM)、扫描电镜(SEM)、拉伸试验机、冲击试验机等研究了两相区淬火温度对Cr-Mn-Si低合金超高强度钢的显微组织及力学性能的影响。结果表明:试验钢在两相区790~850℃内淬火时,在790~820℃内随着淬火温度的升高,碳化物逐渐溶解,铁素体含量不断降低,马氏体含量升高,强度不断上升;当淬火温度为830℃时,铁素体基本消失,强度达到峰值;当淬火温度≥850℃时,碳化物消失,组织结构主要由马氏体+残留奥氏体组成,材料的强韧性基本保持不变。试验钢在850℃淬火+230℃回火时即可获得最佳力学性能,此时抗拉强度为1770 MPa、屈服强度为1447 MPa,断后伸长率为12%、断面收缩率为53%、冲击吸收能量为71 J。Effects of intercritical quenching temperature on the microstructure and mechanical properties of Cr-Mn-Si low-alloy ultra-high strength steel were investigated by using optical microscope(OM),scanning electron microscope(SEM),tensile tester and impact tester.The results show that when the tested steel is quenched within 790-850 ℃,the carbides gradually dissolve,the ferrite content decreases,the martensite content increases and the strength increases with the increase of quenching temperature within 790-820 ℃.When the quenching temperature is 830 ℃,the ferrite basically disappears,and the strength reaches the peak.When the quenching temperature is ≥850 ℃,the carbides disappear,and the microstructure is mainly composed of martensite+retained austenite,the strength and toughness basically remain unchanged.The best mechanical properties of the tested steel can be obtained by quenching at 850 ℃+tempering at 230 ℃ with the tensile strength of 1770 MPa,yield strength of 1447 MPa,elongation after fraction of 12%,reduction of area of 53% and impact absorbed energy of 71 J.

关 键 词：Cr-Mn-Si低合金超高强度钢 两相区淬火 显微组织 力学性能 

分 类 号：TG156.1[金属学及工艺—热处理]