回火形变对亚温淬火中碳低合金钢组织和性能的影响  

Effect of Tempering Deformation on the Microstructure and Properties of Medium-Carbon Low-Alloy Steel After Intercritical Quenching

作　　者：王军 崔艳雄 刘志学[2] 朱晖朝 殷福星 骆智超 WANG Jun;CUI Yanxiong;LIU Zhixue;ZHU Huichao;YIN Fuxing;LUO Zhichao(Institute of New Materials,Guangdong Academy of Sciences/National Engineering Research Center of Powder Metallurgy of Titanium&Rare Metals/Guangdong Provincial Key Laboratory of Metal Toughening Technology and Application,Guangzhou 510650,China;College of Materials and Chemical Engineering Xi’an Technological University,Xi’an 710021,China;Foshan Taoyuan Institute of Advanced Manufacturing,Foshan 528225,China)

机构地区：[1]广东省科学院新材料研究所/国家钛及稀有金属粉末冶金工程技术研究中心/广东省金属强韧化技术与应用重点实验室,广东广州510650 [2]西安工业大学材料与化工学院,陕西西安710021 [3]佛山桃园先进制造研究院,广东佛山528225

出　　处：《材料研究与应用》2022年第6期976-984,共9页Materials Research and Application

摘　　要：中碳低合金钢在低温下的冲击韧性差,使其应用受到一定的限制。为增强中碳低合金的韧性,通过回火形变工艺构筑超细纤维的仿生组织,实现材料的强韧化。结果表明:经过回火形变后的42CrMo钢组织中包含细长纤维晶粒、<101>//RD的强织构及纳米碳化物,这种“类竹子”的仿生组织可显著提高材料的屈服强度和抗拉强度,抗拉强度达1.4 GPa以上;由于仿生纤维组织裂纹分层与分叉的增韧作用,这种新型材料具有更低的韧脆转变温度,在-80℃条件下的冲击韧性高达107 J,综合力学性能显著高于调质处理的42CrMo钢。该研究对高性能金属材料的设计和制造,具有一定的指导意义。The application of medium carbon low alloy steel is limited due to its poor impact toughness at low temperatures. In this paper, the microfiber biomimetic tissue is constructed by the tempering deformation process to achieve the toughening of the material. The results show that the microstructure of42CrMo steel after tempering deformation contains slender fiber grains,strong <101>//RD texture,and nano carbides. This "bamboo-like" biomimetic structure significantly improves the yield and tensile strength of the materials,and the tensile strength reaches more than 1. 4 GPa. Due to the toughening effect of the crack delamination and bifurcation of the biomimetic fiber structure,this new material has a lower ductilebrittle transition temperature,the impact toughness is as high as 107 J at-80 ° C,whose mechanical properties are significantly higher than those of the quenched and tempered 42CrMo steel. This work has guiding significance for the design and fabrication of high-performance metal materials.

关 键 词：中碳低合金钢 回火形变 冲击韧性 分层裂纹 

分 类 号：TG335.1[金属学及工艺—金属压力加工]