Microstructure and Mechanical Properties of 2205 DSS Metal Inert-gas Welding Joints

doi:10.11901/1005.3093.2016.252

Chinese Journal of Materials Research

2016, Vol. 30

Issue (12): 897-903 DOI: 10.11901/1005.3093.2016.252

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Microstructure and Mechanical Properties of 2205 DSS Metal Inert-gas Welding Joints

Guoping LI¹,Jianjun WANG^2,^3,^*(

),Tianhai WU²,Yanhui WEN²,Huabing LI⁴,Chunming LIU^2,³

1. Shanxi Taigang Stainless Steel Co. Ltd, Taiyuan 030003, China
2. School of Materials Science and Engineering, Northeastern University, Shenyang 110819, China
3. Key Laboratory for Anisotropy and Texture of Materials, Northeastern University, Shenyang 110819, China
4. School of Metallurgy, Northeastern University, Shenyang 110819, China

Cite this article:

Guoping LI,Jianjun WANG,Tianhai WU,Yanhui WEN,Huabing LI,Chunming LIU. Microstructure and Mechanical Properties of 2205 DSS Metal Inert-gas Welding Joints. Chinese Journal of Materials Research, 2016, 30(12): 897-903.

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Abstract

2205 DSS plates were welded with four different heat inputs using TIG welding. The microstructures of welding joints were carefully observed by means of OM, SEM, and TEM. The tensile properties and microhardness of welding joints were tested and analyzed in detail. The results show that with the increasing of heat input, the width of strip austenite in incomplete recrystallization zone increases and the grain size of ferrite and the volume fraction of austenite in coarse grain zone increase gradually, while Widmanstatten austenite decreases and blocky austenite increases in weld metal. Widmanstatten austenite is unstable at high temperature and divided into blocks with the formation of fine strip ferrite at the phase boundary. The tensile strength and yield strength decrease while the elongation increases with the increasing of heat input. According to the results of microhardness, the maximum of microhardness appears in the HAZ where ferrite volume fraction is the highest. The microhardness in weld metal is higher than that in base metal due to the relatively higher amounts of alloy elements.

Key words: metallic materials 2205 duplex stainless steel TIG welding heat input Widmanstatten austenite mechanical property

Received: 11 May 2016

Fund: *Supported by National Key Technology Support Program No. 2012BAE04B01 Fundamental Research Funds for the Central Universities No. N140206001 & L1502045 ron and Steel Generic Technology and Collaborative Innovation Funding Project of 2011 Program.

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	Guoping LI
	Jianjun WANG
	Tianhai WU
	Yanhui WEN
	Huabing LI
	Chunming LIU

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https://www.cjmr.org/EN/10.11901/1005.3093.2016.252 OR https://www.cjmr.org/EN/Y2016/V30/I12/897

Table 1 Compositions of 2205 DSS and ER 2209 (mass fraction, %)

Table 2 Welding parameters of TIG

Fig.1 Microstructures of HAZ under different heat inputs: (a, b) Q₁=1.8 kJ/mm; (c, d) Q₂=2.6 kJ/mm; (e, f) Q₃ = 3.4 kJ/mm; (g, h) Q₄ = 4.2 kJ/mm

Fig.2 Microstructures of weld metal under different heat inputs: (a) Q₁= 1.8 kJ/mm; (b) Q₂= 2.6 kJ/mm; (c) Q₃ = 3.4 kJ/mm; (d) Q₄ = 4.2 kJ/mm

Fig.3 TEM image of weld metal under the heat input of 3.4 kJ/mm

Fig.4 Crystallographic orientation of grains obtained from EBSD measurements: (a) weld metal under heat input of 2.6 kJ/mm; (b) weld metal under heat input of 3.4 kJ/mm

Fig.5 Tensile properties of welding joints under different heat inputs

Fig.6 Microhardness in different areas of the welding joints under different heat inputs

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