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Dramatically enhanced impact toughness in welded ultra-ferritic stainless steel by additional nitrogen gas in Ar-based shielding gas

Published online by Cambridge University Press:  02 November 2016

Heng Li ,
Wenqing Xing ,
Xinye Yu ,
Wei Zuo ,
Le Ma ,
Peng Dong ,
Wenxian Wang ,
Guangwei Fan ,
Jie Lian  and
Min Ding
Heng Li
Affiliation:
College of Materials Science and Engineering, Taiyuan University of Technology, 030024 Taiyuan, Shanxi Province, China
Wenqing Xing
Affiliation:
College of Materials Science and Engineering, Taiyuan University of Technology, 030024 Taiyuan, Shanxi Province, China
Xinye Yu
Affiliation:
College of Materials Science and Engineering, Taiyuan University of Technology, 030024 Taiyuan, Shanxi Province, China
Wei Zuo
Affiliation:
College of Materials Science and Engineering, Taiyuan University of Technology, 030024 Taiyuan, Shanxi Province, China
Le Ma
Affiliation:
College of Materials Science and Engineering, Taiyuan University of Technology, 030024 Taiyuan, Shanxi Province, China
Peng Dong
Affiliation:
College of Materials Science and Engineering, Taiyuan University of Technology, 030024 Taiyuan, Shanxi Province, China
Wenxian Wang
Affiliation:
College of Materials Science and Engineering, Taiyuan University of Technology, 030024 Taiyuan, Shanxi Province, China; and Key Laboratory of Interface Science and Engineering in Advanced Materials, Ministry of Education, 030024 Taiyuan, Shanxi Province, China
Guangwei Fan
Affiliation:
Key Laboratory of Interface Science and Engineering in Advanced Materials, Ministry of Education, 030024 Taiyuan, Shanxi Province, China; and Technology Center, Taiyuan Iron and Steel (Group) Company Limited, 030003 Taiyuan, China; and Technology Center, Taiyuan Iron and Steel (Group) Company Limited, 030003 Taiyuan, China
Jie Lian
Affiliation:
Key Laboratory of Interface Science and Engineering in Advanced Materials, Ministry of Education, 030024 Taiyuan, Shanxi Province, China; and Technology Center, Taiyuan Iron and Steel (Group) Company Limited, 030003 Taiyuan, China; and Technology Center, Taiyuan Iron and Steel (Group) Company Limited, 030003 Taiyuan, China
Min Ding*
Affiliation:
College of Materials Science and Engineering, Taiyuan University of Technology, 030024 Taiyuan, Shanxi Province, China; and Key Laboratory of Interface Science and Engineering in Advanced Materials, Ministry of Education, 030024 Taiyuan, Shanxi Province, China
*
a) Address all correspondence to this author. e-mail: dingmin@tyut.edu.cn
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Abstract

The effect of nitrogen gas addition in Ar-based double-layer shielding gas on the impact toughness of welded ultra-ferritic stainless steel during an autogenous gas tungsten arc welding (GTAW) process was investigated. The nitrogen behavior was proposed. The microstructure, mechanical properties, and fracture surface morphology of the weld metals have been evaluated. More equiaxed crystals, refined grain, narrow HAZ width, and increased microhardness were produced with nitrogen addition. Experimental findings indicated that nitrogen diffused into HAZ and dissolved into weld pool. The solute distribution was changed thus bringing significant constitutional supercooling and decreased temperature gradient of weld pool, which contributed to fine microstructure. Impact toughness at room temperature was enhanced from 2J to 9J (welds), 5J–13J (HAZ). Ductile fracture zone was produced about 0.3–0.5 mm thickness distance from the weld surface. A significant increased impact toughness of weld metal was due to the refinement of microstructure and element addition.

Keywords

toughnessGTAWnitrogen behaviorgrain refinement
Type
Articles
Information
Journal of Materials Research , Volume 31 , Issue 22 , 28 November 2016 , pp. 3610 - 3618
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Copyright
Copyright © Materials Research Society 2016 

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