Effects of Ti-bearing Inclusions on the Microstructure and Mechanical Properties of MAG Multilayer Weld Metal

doi:10.11890/1006-7191-121-1

Acta Metallurgica Sinica (English Letters) ›› 2012, Vol. 25 ›› Issue (1): 1-9.DOI: 10.11890/1006-7191-121-1

• 研究论文 • 下一篇

Effects of Ti-bearing Inclusions on the Microstructure and Mechanical Properties of MAG Multilayer Weld Metal

王鑫

中国科学院金属研究所沈阳材料科学国家（联合）实验室

收稿日期:2011-07-20 修回日期:2011-11-27 出版日期:2012-02-25 发布日期:2012-02-16
通讯作者: 王鑫

Effects of Ti-bearing inclusions on the microstructure and mechanical properties of MAG multilayer weld metal

Xin WANG¹, Wenchao DONG¹, Shanping LU¹, Guangzhong HE², Xu ZHAO², Dianmai ZHOU², Yiyi LI¹

1. Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of\par\noindent Sciences, Shenyang 110016, China
2. Changchun Railway Vehicles Co., Ltd., Changchun 130026, China

Received:2011-07-20 Revised:2011-11-27 Online:2012-02-25 Published:2012-02-16
Contact: Shanping LU

摘要/Abstract

摘要： The MAG multilayer weld metal consists of the columnar grain zone (CGZ) and the fine grain zone (FGZ). Mechanical properties and microstructure of the CGZ and FGZ have been analyzed and evaluated. The characteristic morphology of the typical normal distributuion inclusions has been analyzed using transmission electron microscope (TEM). With the microalloy element Ti addition, much MnTiO3 phase precipitates on the Mn-silicates matrix, which causes the Mn depleted zones (MDZs) much larger, and is beneficial for the nucleation of acicular ferrite (AF) and the refinement of primary ferrite (PF). A kind of welding consumable, which can satisfy the impact toughness at -40℃, has been successfully developed.

Abstract: The metal active gas (MAG) multilayer weld metal consists of the columnar grain zone (CGZ) and the fine grain zone (FGZ). Mechanical properties and microstructure of the CGZ and FGZ have been analyzed and evaluated. The inclusion with a size of 0.2-1.0 μm is typical log-normal distribution. The morphology of inclusions has been analyzed using transmission electron microscope (TEM). With the microalloying element Ti addition, much MnTiO₃ phase precipitates on the Mn-silicates matrix, which is beneficial for the nucleation of acicular ferrite (AF). The probable mechanism for the nucleation of AF has been discussed.

Key words: Ti-bearing weld metal, Inclusion, MAG welding

王鑫. Effects of Ti-bearing Inclusions on the Microstructure and Mechanical Properties of MAG Multilayer Weld Metal[J]. Acta Metallurgica Sinica (English Letters), 2012, 25(1): 1-9.

Xin WANG, Wenchao DONG, Shanping LU, Guangzhong HE, Xu ZHAO, Dianmai ZHOU, Yiyi LI. Effects of Ti-bearing inclusions on the microstructure and mechanical properties of MAG multilayer weld metal[J]. Acta Metallurgica Sinica (English Letters), 2012, 25(1): 1-9.

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Effects of Ti-bearing Inclusions on the Microstructure and Mechanical Properties of MAG Multilayer Weld Metal

Effects of Ti-bearing inclusions on the microstructure and mechanical properties of MAG multilayer weld metal

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