超级贝氏体对1.37wt.%C超高碳钢强度和韧性的影响  

Effect of superbainite on the strength and toughness of ultrahigh-carbon steel with 1.37wt.%C

作　　者：刘宏基 宋兆焕 张喜亮 谢海龙 郑立允 柳永宁[2] 赵树国[3] LIU Hongji;SONG Zhaohuan;ZHANG XiLiang;XIE Hailong;ZHENG Liyun;LIU Yongning;ZHAO Shuguo(School of Materials Science and Engineering,Hebei University of Engeering,Hebei Handan,056038,China;State Key Laboratory for Mechanical Behavior of Materials,Xi＇an Jiaotong University,Shanxi Xi＇an,710049,China;Handan Polytechnic College,Hebei Handan,056001,China)

机构地区：[1]河北工程大学材料科学与工程学院,河北邯郸056038 [2]西安交通大学金属材料强度国家重点实验室,陕西西安710049 [3]邯郸职业技术学院,河北邯郸056001

出　　处：《河北工程大学学报（自然科学版）》2018年第3期90-96,共7页Journal of Hebei University of Engineering:Natural Science Edition

基　　金：国家自然科学基金资助项目(51701059);西安交通大学金属材料强度国家重点实验室开放研究项目(20171908)

摘　　要：研究1.37%C(质量分数)超高碳钢(UHCS-1.37C)经990℃奥氏体化,270℃和310℃等温淬火不同时间后空冷的组织和力学性能。组织研究表明,UHCS-1.37C经等温淬火热处理后获得了由纳米级贝氏体铁素体+薄膜状残余奥氏体组成的超级贝氏体组织。在同一等温温度下,随着等温时间的延长,超级贝氏体的数量不断增加,马氏体数量减少;在相同的等温时间内,等温温度越高,生成的超级贝氏体数量越多。力学测试结果表明,UHCS-1.37C在310℃等温8 h后获得了最佳的强韧性配合,其抗拉强度为1 622 MPa,断后伸长率为5.5%,冲击吸收能量为12.7 J。UHCS-1.37C等温组织优异的力学性能归因于超级贝氏体组织。The microstructures and mechanical properties of an ultrahigh-carbon steel with 1.37 wt.%C subjected to austenitization at single γ phase region and austempering at low temperatures have been studied. The results show that a superbainite comprising lamar bainite ferrite and film-type retained austenite is generated. An impact absorbed energy of 12.7 J,a fraction strength of 1 622 MPa and an elongation of 5.5% are obtained for UHCS-1.37C austempered at 310℃ for 8 h. The combination of excellent strength and toughness is attributed to the superbainite.

关 键 词：超高碳钢 超级贝氏体 强度 韧性 

分 类 号：TG142[一般工业技术—材料科学与工程]