固溶-高温回火对D2钢组织性能的影响  

Influence of solid solution and high temperature tempering on microstructure and properties of D2 steel

作　　者：刘健波 张学宾[1,2] 宋克兴 杨留栓[3] 葛学元 LIU Jian-bo;ZHANG Xue-bin;SONG Ke-xing;YANG Liu-shuan;GE Xue-yuan(School of Materials Science and Engineering, Henan University of Science and Technology, Luoyang 471023, China;Collaborative Innovation Center of Nonferrous Metals, Henan Province, Luoyang 471023, China;Henan University of Urban Construction, Pingdingshan 467036, China;China Academy of Machinery Science and Technology, Beijing 100083, China)

机构地区：[1]河南科技大学材料科学与工程学院,河南洛阳471023 [2]有色金属共性技术河南省协同创新中心,河南洛阳471023 [3]河南城建学院,河南平顶山467036 [4]机械科学研究总院,北京100083

出　　处：《材料热处理学报》2018年第4期107-112,共6页Transactions of Materials and Heat Treatment

基　　金：国家重点研发计划项目(2016YFB0300400);河南省创新型科技团队(C20150014);河南省科技攻关计划(国际科技合作)项目(162102410025)

摘　　要：对D2钢进行不同处理后,利用OM、SEM和XRD进行了微观组织分析,并测试了硬度与冲击韧性,研究固溶-高温回火球化预处理对D2钢微观组织与性能的影响。结果表明：D2钢经固溶-高温回火处理后碳化物偏析程度明显降低,高温回火时碳和合金元素从过饱和的马氏体基体中析出,均匀聚集长大形成合金碳化物颗粒,改善了基体中碳化物的形态和分布;最佳的预处理工艺参数为780℃回火6 h,经最佳预处理-淬回火后,材料冲击韧性提高了23.8%。Microstructure of D2 steel after different treatments was analyzed by means of optical microscope（ OM）,scanning electron microscopy（ SEM） and X-ray diffraction（ XRD）,and the hardness and impact toughness were tested. The influence of solid solution and high temperature tempering spheroidizing pretreatment on the microstructure and property of the D2 steel was studied. The results show that the segregation degree of carbides of the steel decreases obviously after solid solution and high temperature tempering treatment,and the carbon and alloy elements precipitate from the supersaturated martensite matrix during high temperature tempering,and the morphology and distribution of the carbides in matrix are improved by uniform aggregation and growth of alloy carbide particles. The optimum pretreatment process of the steel is tempering at 780 ℃ for 6 h,and the impact toughness increases by 23. 8% after the optimum pretreatment quenching and tempering.

关 键 词：D2钢 球化预处理 碳化物 微观组织 冲击韧性 

分 类 号：TG142.45[一般工业技术—材料科学与工程]