| 引用本文: | 娄宇航,肖红军,田志凌,彭增华.热输入对E40钢双丝埋弧焊焊缝组织及性能的影响[J].材料科学与工艺,2013,21(1):6-12.DOI:10.11951/j.issn.1005-0299.20130102. |
| LOU Yu-hang,XIAO Hong-jun,TIAN Zhi-ling,PENG Zeng-hua.Effect of large heat input on microstructure and properties of welds in E40steel[J].Materials Science and Technology,2013,21(1):6-12.DOI:10.11951/j.issn.1005-0299.20130102. |
|
| 摘要: |
| 为研究最新研制的大热输入焊接所用低合金高强实心焊丝G55,对大热输入用钢E40进行热输入分别为60、122、158kJ/cm的双丝埋弧焊焊接.经过拉伸、冲击试验及光学显微镜、扫描电镜和透射电镜分析,对焊接接头焊缝组织性能进行研究,并对接头强韧性进行分析.结果表明:不同热输入焊缝组织均以针状铁素体组织为主；随着热输入的增加,焊缝冲击韧性增加,这是因为焊接热输入增加时,柱状晶比例减小、宽度增加,针状铁素体含量增加；焊缝中含氧量减少,夹杂物数量减少；焊接道次减少导致块状铁素体含量减少等三方面因素.随着热输入的增加,焊缝金属强度提高,主要是因焊缝针状铁素体组织含量增加. |
| 关键词: 热输入 针状铁素体 夹杂物 M-A 力学性能 |
| DOI：10.11951/j.issn.1005-0299.20130102 |
| 分类号: |
| 基金项目:国家高技术研究发展计划资助项目(2009AA032530). |
|
| Effect of large heat input on microstructure and properties of welds in E40steel |
|
LOU Yu-hang1,2,XIAO Hong-jun1,TIAN Zhi-ling1,PENG Zeng-hua2
|
|
(1.China Iron and Steel Research Institute Group,Beijing 100081,China;;2.Department of Material Science and Engineering,Kunming University of Science and Technology,Kunming 650093,China )
|
| Abstract: |
| A newly developed high strength low alloy welding wire G55for High Heat Input Welding was studied.E40steel was welded with heat input of 60、122、158kJ/cm by Dual Wire Arc Welding using welding wire G55.Mechanical properties were analyzed and microstructures were observed by OM(Optical Microscopy),SEM (Scanning Electron Microscopy) and TEM (Transmission Electron Microscopy).The results indicated that the microstructures of welds at different heat inputs welding were main AF(Acicular Ferrite).With heat inputs increasing,the impact toughness of welds increased due to the increasing of width of columnar grains and percentage of acicular ferrite;the reducing of oxygen content of welds and number of inclusions;and the reducing of thermal cycling and weak zone of welds with massive ferrite.The strength of welds increased mainly because of the increasing of acicular ferrite. |
| Key words: heat input acicular ferrite inclusion M-A mechanical property |
