淬火温度对空冷贝氏体-马氏体复相耐磨钢组织性能的影响  

Effect of quenching temperature on microstructure and properties of air-cooled bainite-martensite multiphase wear-resistant steel

作　　者：闫洪涛 王永金 齐海龙 黄岩 张科明 张澣斗 母镕 Yan Hongtao;Wang Yongjin;Qi Hailong;Huang Yan;Zhang Keming;Zhang Huandou;Mu Rong(Dong'anshan Sintering Plant,Anshan Iron and Steel Group Company Limited,Anshan Liaoning 114000,China;School of Material Science and Engineering,University of Science and Technology Beijing,Beijing 100083,China)

机构地区：[1]鞍山钢铁集团有限公司东鞍山烧结厂,辽宁鞍山114000 [2]北京科技大学材料科学与工程学院,北京100083

出　　处：《金属热处理》2023年第3期129-134,共6页Heat Treatment of Metals

摘　　要：设计了一种空冷贝氏体-马氏体复相耐磨铸钢的成分并进行冶炼浇注与热处理。通过力学性能测试、显微组织及断口形貌观察、X射线衍射分析等方法,研究淬火温度对组织和性能的影响。结果表明,经900℃淬火1 h后空冷至室温,随后在300℃回火2 h并空冷至室温,获得了综合力学性能最佳的贝氏体-马氏体复相耐磨铸钢,抗拉强度1729 MPa,断后伸长率4.3%,布氏硬度为454 HBW,V型缺口冲击吸收能量为19.31 J。其组织中含有10%左右的残留奥氏体,能够提高基体强韧性。An air-cooling bainite-martensite multiphase wear-resistant cast steel was designed,smelted,poured and heat treated.The effect of quenching temperature on microstructure and properties were studied by means of mechanical properties test,microstructure and fracture morphology observation,and X-ray diffraction analysis.The results show that after quenching at 900℃for 1 h,air-cooling to room temperature,and then tempering at 300℃for 2 h,and air-cooling to room temperature,the bainite-martensite multiphase wear-resistant cast steel with the best comprehensive mechanical properties is obtained,of which the tensile strength is 1729 MPa,elongation after fracture is 4.3%,Brinell hardness is 454 HBW,and V-notch impact absorbed energy is 19.31 J.Its microstructure contains about 10%retained austenite,which can improve the strength and toughness of the matrix.

关 键 词：复相耐磨钢 淬火温度 力学性能 断口形貌 残留奥氏体 

分 类 号：TG162.9[金属学及工艺—热处理]