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| X80管线钢气体保护焊用焊丝的研制 | |
| 引用本文： | 李冉,魏金山,彭云,田志凌,施哲.X80管线钢气体保护焊用焊丝的研制[J].焊接学报,2007,28(7):97-100. |
| 作者姓名： | 李冉 魏金山 彭云 田志凌 施哲 |
| 作者单位： | 1. 钢铁研究总院,先进钢铁流程及材料国家重点实验室,北京,100081;昆明理工大学,材料与冶金工程学院,昆明,650093 2. 钢铁研究总院,先进钢铁流程及材料国家重点实验室,北京,100081 3. 昆明理工大学,材料与冶金工程学院,昆明,650093 |
| 摘 要： | 对所研制的焊丝进行了气体保护焊试验,测试了焊缝金属的化学成分、金相组织、冲击韧度、强度、硬度和接头的抗拉强度.金相组织主要为针状铁素体、少量的先共析铁素体和粒状贝氏体,用扫描电镜分析了冲击断口的形貌和夹杂物的组成,用透射电镜分析了焊缝金属的微观结构.结果表明,在焊丝中加入微量的Ti-B,可以有效地抑制先共析铁素体的形成,使焊缝获得细小、均匀的针状铁素体组织.焊缝中合金元素形成了弥散分布的细小夹杂物,成为了针状铁素体(AF)的形核质点.针状铁素体内有许多位错团,可以有效地阻止裂纹的扩展,提高冲击韧度. |
| 关 键 词： | X80管线钢 气体保护焊 低温韧性 针状铁素体 夹杂物 管线钢 气体保护焊 焊丝 pipeline steel welding wire metal 扩展 裂纹 位错团 核质 弥散分布 合金元素 铁素体组织 针状 均匀 焊缝 微量 结果 微观结构 透射电镜分析 |
| 文章编号： | 0253-360X（2007）07-097-04 |
| 收稿时间： | 2006/12/29 0:00:00 |
| 修稿时间： | 2006-12-29 |
Development of gas metal arc welding wire for X80 pipeline steel |
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| LI Ran,WEI Jinshan,PENG Yun,TIAN Zhiling and SHI Zhe.Development of gas metal arc welding wire for X80 pipeline steel[J].Transactions of The China Welding Institution,2007,28(7):97-100. | |
| Authors: | LI Ran WEI Jinshan PENG Yun TIAN Zhiling and SHI Zhe |
| Affiliation: | State Key Laboratory of Advanced Steel Processes and Products, Central Iron & Steel Research Institute, Beijing 100081, China;Faculty of Materials and Metallurgical Engineering Kunming University of Science & Technology, Kunming 650093, China,State Key Laboratory of Advanced Steel Processes and Products, Central Iron & Steel Research Institute, Beijing 100081, China,State Key Laboratory of Advanced Steel Processes and Products, Central Iron & Steel Research Institute, Beijing 100081, China,State Key Laboratory of Advanced Steel Processes and Products, Central Iron & Steel Research Institute, Beijing 100081, China and Faculty of Materials and Metallurgical Engineering Kunming University of Science & Technology, Kunming 650093, China |
| Abstract: | The developed wires are used for gas metal arc welding. The chemical composition,microstructure,impact toughness,strength,hardness and tensile strength of welded joint are investigated. The microstructure is composed of acicular ferrite and a little proeutectoid ferrite and a little granular bainite. The fractured surfaces of impact specimen are analyzed by scanning electron microscope, and the microstructures of weld metal are analyzed by transmission electron microscope. Experiment results indicated that it was effective to resist proeutectoid ferrite and make fine homogeneous acicular formation by adding microcontent Ti-B elements in the wire. It had been found that alloy element in weld metal could be the nucleating-centers of acicular ferrite as long as they formed fine disperse inclusion. It is effective to prevent crack propagation and improve impact toughness because there are lots of dislocation agglomerating in acicular ferrite. |
| Keywords: | X80 pipeline steel gas metal arc welding low-temperature toughness acicular ferrite inclusion |
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