时效时间对低密度超高锰铸钢组织性能的影响  

Effect of aging time on microstructure and properties of a low density ultra-high manganese cast steel

作　　者：高志喆 程福超 冯一帆[2] 孙健 王永金 Gao Zhizhe;Cheng Fuchao;Feng Yifan;Sun Jian;Wang Yongjin(Dagushan Pelleting Plant of Anshan Group Co.,Anshan Liaoning 114004,China;School of Materials Science and Engineering,University of Science and Technology Beijing,Beijing 100083,China;Ansteel Mining Corporation,Anshan Liaoning 114004,China)

机构地区：[1]鞍山钢铁集团有限公司大孤山球团厂,辽宁鞍山114004 [2]北京科技大学材料科学与工程学院,北京100083 [3]鞍钢集团矿业有限公司,辽宁鞍山114004

出　　处：《金属热处理》2021年第8期115-120,共6页Heat Treatment of Metals

摘　　要：为了提高传统高锰钢的初始硬度和强度,设计一种低密度超高锰铸钢,水韧处理后在550℃分别保温1~4 h时效处理,研究保温时间对试验钢组织性能的影响。试验结果显示:当时效保温时间为2 h,试验钢的综合力学性能最佳,其抗拉强度为1041.7 MPa,屈服强度为1002.7 MPa,断后伸长率为17.6%,冲击吸收能量(V型缺口)为62.0 J,硬度为268.5 HBS;与仅水韧处理相比屈服强度提高了107.3%,硬度提高了28.8%。试验钢强度和硬度的提升主要来自于纳米级κ碳化物的析出强化。To improve the initial hardness and strength,an low density ultra-high manganese cast steel was designed.After water toughening,the tested steel was carried out aging treatment at 550℃for 1-4 h and the effect of aging time on microstructure and properties was investigated.The experimental results show that the tested steel can obtained optimum mechanical properties after aging for 2 h.Its tensile strength is 1041.7 MPa,yield strength is 1002.7 MPa,elongation is 17.6%,impact absorbed energy(V-notch)is 62.0 J,and hardness is 268.5 HBS.Compared with the as-water toughened,the yield strength and the hardness of the steel are increased by 107.3%and 28.8%respectively,which can be attributed to the precipitation-hardened effect originating from the precipitation of nano-sizedκ-carbides.

关 键 词：超高锰钢 低密度 时效处理 显微组织 力学性能 

分 类 号：TG142.1[一般工业技术—材料科学与工程]