Effect of Ti on the microstructure and mechanical properties  of MAG multipass weld metal

IMR OpenIR

	Effect of Ti on the microstructure and mechanical properties of MAG multipass weld metal
其他题名	Effect of Ti on the microstructure and mechanical properties of MAG multipass weld metal
	Wang Xin; Lu Shanping; Li Dianzhong; Li Yiyi
	2011
发表期刊	中国焊接：英文版
ISSN	1004-5341
卷号	20.0 期号:1.0 页码:70-75
摘要	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.
其他摘要	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.
关键词	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
收录类别	CSCD
语种	中文
CSCD记录号	CSCD:4221454
引用统计
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/150556
专题	中国科学院金属研究所
作者单位	中国科学院金属研究所
推荐引用方式 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.