回火对E101T1-K3C熔敷金属显微组织和力学性能的影响  

Effect of tempering on microstructure and mechanical propertiesof E101T1-K3C deposite metal

作　　者：邬亲丹 林毅 官忠波 杨飞[1] 朱宇霆[1] Wu Qindan;Lin Yi;Guan Zhongbo;Yang Fei;Zhu Yuting(Atlantic China Welding Consumables,INC,Zigong 643000,Sichuan,China;Sichuan University of Science and Engineering,Zigong 643000,Sichuan,China;Material Corrosion and Protection Key Laboratory of Sichuan Province,Zigong 643000,Sichuan,China)

机构地区：[1]四川大西洋焊接材料股份有限公司,四川自贡643000 [2]四川轻化工大学,四川自贡643000 [3]材料腐蚀与防护四川省重点实验室,四川自贡643000

出　　处：《机械制造文摘（焊接分册）》2024年第1期1-5,11,共6页Welding Digest of Machinery Manufacturing

基　　金：四川省科技计划专项(2022YFG0363)。

摘　　要：采用E101T1-K3C低合金高强钢药芯焊丝对EH620钢进行焊接。焊接接头分别在460℃、580℃进行保温1 h回火热处理,应用金相显微镜、材料试验机、冲击试验机、扫描电子显微镜等对试样进行分析与测量。结果表明:焊态下熔敷金属显微组织为条状铁素体+少量贝氏体+第二相颗粒,熔合区显微组织为片状铁素体+马氏体+第二相颗粒。焊接接头经过460℃×1 h焊后回火处理后,焊缝区的显微组织为铁素体+少量贝氏体+第二相颗粒,熔合区组织为铁素体+回火屈氏体+第二相颗粒。焊接接头经过580℃×1 h回火处理后,焊缝及熔合区显微组织均为铁素体+回火索氏体+第二相颗粒;熔敷金属屈服强度由725 MPa下降589 MPa,-40℃冲击吸收能量KV2由71 J提高到114 J;维氏硬度值在焊接接头焊缝及热影响区的分布趋向一致,焊接接头具有理想的力学性能。EH620 steel was welded using E101T1-K3C low-alloy high-strength steel flux cored wire.The joint was tempered at both 460℃and 580℃for 1 h.Metallographic microscope,material testing machine,impact testing machine,and scanning electron microscope were applied to analyze and measure the microstructure and mechanical properties of the sample.The results shows that the microstructure of the weld metal was predominated by lamellar ferrite,bainite,and second phase particles.The microstructure of the fusion zone consisted of lamellar ferrite,martensite,and second phase particles.After tempering at 580℃,the weld and fusion zone was composed of ferrite,tempered sorbite,and second phase particles.And the yield strength of the weld metal decreased from 725 to 589 MPa,while the impact energy KV 2 at-40℃increased from 71 to 114 J.Additionally,the Vickers hardness value distribution became more uniform throughout the weld seam and HAZ,and the welding joint exhibited admirable mechanical properties.

关 键 词：E101T1-K3C 高强钢焊丝 焊接 回火 

分 类 号：TG455[金属学及工艺—焊接] TG156.5