维普中文期刊产品整合服务

Microstructure and properties in dissimilar/similar weld joints between DP780 and DP980 steels processed by fiber laser welding

查看全文 作　　者：Hongshuang [1]Di;Qian [1]Sun;Xiaonan [2]Wang;Jianping [1]Li 高影响力作者 机构地区：[1]State Key Laboratory of Rolling and Automation,Northeastern University,Shenyang 110819,China;[2]Shagang School of Iron and Steel,Soochow University,Suzhou 215021,China高影响力机构 出　　处：《Journal of Materials Science & Technology》索引2017年第33卷第12期,共11页高影响力期刊 基　　金：financially supported by the National Natural Science Foundation of China(Grant Nos.51274063 and 51305285);the National Program on Key Basic Research Project(Grant No.2011CB606306-2);the Open Research Fund from the State Key Laboratory of Rolling and Automation,Northeastern University(Grant No.2016005);the Project Funded by China Postdoctoral Science Foundation(Grant No.2016M601877) 摘　　要：The microstructure and mechanical properties(strength, fatigue and formability) of dissimilar/similar weld joints between DP780 and DP980 steels were studied. The microstructure in fusion zone(FZ) was lath martensite(LM), and alloying elements in the FZ were uniformly distributed. The hardness in the FZ of dissimilar weld joint was similar to the average value(375 HV) of the two similar weld joints. The microstructural evolution in heat affected zone(HAZ) of dissimilar/similar weld joints was as follows:LM(coarse-grained HAZ) →finer LM(fine-grained HAZ) →M-A constituent and ferrite(intercritically HAZ) →tempered martensite(TM) and ferrite(sub-critical HAZ). Lower hardness in intercritically HAZ and sub-critical HAZ(softening zones) was observed compared to base metal(BM) in dissimilar/similar weld joints. The size of softening zone was 0.2–0.3 mm and reduction in hardness was ~7.6%–12.7% of BM in all the weld joints, which did not influence the tensile properties of weld joints such that fracture location was in BM. Formability of dissimilar weld joints was inferior compared to similar weld joints because of the softening zone, non-uniform microstructure and hardness on the two sides of FZ. The effect of microstructure on fatigue life was not influenced due to the presence of welding concavity. 关 键 词：焊接处理 微观结构 机械性质 关节 类似 板条马氏体 激光 纤维
相关文献

参考文献(35)

引证文献(9)

耦合文献(3)

网站首页 | 关于我们 | 联系我们 | 产品服务 | 客服中心 | 广告服务 | 版权声明 | 网站联盟 | 友情链接 | 售卡网点

版权所有© 渝B2-20050021-1　渝公网安备 50019002500403号　违法和不良信息举报中心

互联网出版许可证 新出网证(渝)字10号 全国400电话 - 免长途话费