| Effect of Ti on the microstructure and mechanical properties of MAG multipass weld metal | |
| Alternative Title | Effect of Ti on the microstructure and mechanical properties of MAG multipass weld metal |
| Wang Xin; Lu Shanping; Li Dianzhong; Li Yiyi | |
| 2011 | |
| Source Publication | 中国焊接：英文版
 |
| ISSN | 1004-5341 |
| Volume | 20.0Issue:1.0Pages:70-75 |
| Abstract | Metal active gas （ MAG） welding has been carried out on microalloy controlled rolling steel （S355J2W） by two kinds of welding wires with different Ti content. The mechanical tests have been carried out on the welded joint. The optical microscope and scanning electron microscope （SEM） observations have been performed to investigate the effect of microalloy element Ti on the microstructure of weld metal and impact fracture, respectively. The microstrueture of the MAG multipass weld metal includes the columnar grain zone （CGZ） consisting of primary ferrite （ PF）, ferrite with second phase （FS） and acicularferrite （AF）, and the fine grain zone （FGZ） consisting of polygonal ferrite due to the heat effect of subsequent welding pass. It has been found that the small amount of Ti can significantly increase the impact energy of the weld metal at low temperature and weakly affect tensile strength of welded joint. By adding small amount of Ti, the inclusions have changed from Mn-Si-O inclusions to Ti-bearing inclusions, which causes the Mn-depleted zones（MDZs） much larger and is beneficial to the impact energy by promoting the AF formation, refining the PF and pinning the austenite grain boundary during the subsequent transformation process. |
| Other Abstract | Metal active gas （ MAG） welding has been carried out on microalloy controlled rolling steel （S355J2W） by two kinds of welding wires with different Ti content. The mechanical tests have been carried out on the welded joint. The optical microscope and scanning electron microscope （SEM） observations have been performed to investigate the effect of microalloy element Ti on the microstructure of weld metal and impact fracture, respectively. The microstrueture of the MAG multipass weld metal includes the columnar grain zone （CGZ） consisting of primary ferrite （ PF）, ferrite with second phase （FS） and acicularferrite （AF）, and the fine grain zone （FGZ） consisting of polygonal ferrite due to the heat effect of subsequent welding pass. It has been found that the small amount of Ti can significantly increase the impact energy of the weld metal at low temperature and weakly affect tensile strength of welded joint. By adding small amount of Ti, the inclusions have changed from Mn-Si-O inclusions to Ti-bearing inclusions, which causes the Mn-depleted zones（MDZs） much larger and is beneficial to the impact energy by promoting the AF formation, refining the PF and pinning the austenite grain boundary during the subsequent transformation process. |
| Keyword | 焊缝金属 微观结构 钛含量 MAG 机械性能 扫描电子显微镜 焊接接头 多道 |
| Indexed By | CSCD |
| Language | 中文 |
| CSCD ID | CSCD:4221454 |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://ir.imr.ac.cn/handle/321006/150556 |
| Collection | 中国科学院金属研究所 |
| Affiliation | 中国科学院金属研究所 |
| Recommended Citation GB/T 7714 | Wang Xin,Lu Shanping,Li Dianzhong,et al. Effect of Ti on the microstructure and mechanical properties of MAG multipass weld metal[J]. 中国焊接：英文版,2011,20.0(1.0):70-75. |
| APA | Wang Xin,Lu Shanping,Li Dianzhong,&Li Yiyi.(2011).Effect of Ti on the microstructure and mechanical properties of MAG multipass weld metal.中国焊接：英文版,20.0(1.0),70-75. |
| MLA | Wang Xin,et al."Effect of Ti on the microstructure and mechanical properties of MAG multipass weld metal".中国焊接：英文版 20.0.1.0(2011):70-75. |
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