一种锰镍钼硼合金系埋弧焊丝焊接低碳贝氏体钢接头的组织及性能
Microstructure and Properties of Low-Carbon Bainitic Steel Joints Welded Using a Mn-Ni-Mo-B Alloy Welding Wire for Submerged-Arc Welding
摘 要
用自行设计的锰镍钼硼合金系焊丝对低碳贝氏体钢进行双面焊;利用光学显微镜、扫描电子显微镜、拉伸和冲击试验机以及显微硬度计等研究了焊接接头的显微组织和力学性能。结果表明:焊缝和热影响区显微组织都主要是针状铁素体和粒状贝氏体;HAZ区组织粗大,存在软化问题;在较小的焊接线热输入条件下,焊接接头强韧性匹配较好,抗拉强度为803.63 MPa,焊缝和热影响区冲击韧性分别为193 J和232 J。
焊丝
埋弧焊
显微组织
力学性能
low carbon bainitic steel
welding wire
submerge-arc welding
microstructure
mechanical property
Abstract
A self-designed Mn-Ni-Mo-B alloy welding wire was used to weld low-carbon bainitic steel by double-sided welding. The microstructure and mechanical properties of the welded joints were studied by optical microscopy, scanning electron microscopy, tensile testing, impact testing and hardness testing. Results show that the microstructure of weld and HAZ were mainly acicular ferrite and granular bainite. The HAZ with coarse grains showed a little softening. Under the condition of relatively small welding line energy, the welded joints had a good matching of strength and toughness. The tensile strength was 803.63 MPa while impact toughness of the weld and HAZ was 193 J and 232 J.
中图分类号 TG423
所属栏目 试验研究
基金项目 国家自然科学基金资助项目(51274162);国家高技术研究发展计划项目(2013AA031303);陕西省教育厅产业化培育项目(2012JC16)
收稿日期 2013/8/27
修改稿日期 2014/8/11
网络出版日期
作者单位点击查看
备注张敏(1967-),男,陕西西安人,教授,博士。
引用该论文: ZHANG Min,CHEN Yang-yang,YANG Liang,LIU Ming-zhi,XING Kui. Microstructure and Properties of Low-Carbon Bainitic Steel Joints Welded Using a Mn-Ni-Mo-B Alloy Welding Wire for Submerged-Arc Welding[J]. Materials for mechancial engineering, 2014, 38(11): 26～30
张敏,陈阳阳,杨亮,刘明志,邢奎. 一种锰镍钼硼合金系埋弧焊丝焊接低碳贝氏体钢接头的组织及性能[J]. 机械工程材料, 2014, 38(11): 26～30
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参考文献
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【3】孙德勤,吴春京,谢建新.贝氏体钢的研究开发现状与发展前景探讨［J］.机械工程材料,2011,34(1):25-28.
【4】文学. 埋弧自动焊主要焊接工艺参数的简便计算公式［J］.安装,1997(3):11-12.
【5】KONG Jun-hua, ZHEN Lin, GUO Bin, et al. Influence of Mo content on microstructure and mechanical properties of high strength pipeline steel［J］.Materials and Design,2004,25(8):723-728.
【6】SUDARSANAM S B. The mechanism of acicular ferrite in weld deposites［J］.Current Opinion in Solid State and Materials Science,2004,34 (8):267-278.
【7】胡汉起. 金属凝固原理［M］.北京:机械工业出版社,2000.
【8】杨军,吴鲁海,茅及放.低合金高强钢焊缝熔敷金属强韧化机理［J］.焊接学报,2006,27(3):86-90.
【9】ZHANG Ying-qiao, ZHANG Han-qian. Effect of heat input on microstructure and toughness of coarse grain heat affected zone in Nb microalloyed HSLA steels［J］.Journal of Iron and Steel Research International,2009,16(5):73-80.
【10】李继红,杨亮,张敏.X100管线钢埋弧焊焊接接头的力学性能分析［J］.热加工工艺,2013,42(6):159-163.
【11】LIS A K, LIS J, JEZIOESKI L. Advanced ultra-low carbon bainitic steels with high toughness［J］.Journal of Materials Processing Technology,1997,64:255-266.
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