Effect of heat input on microstructure and mechanical properties of wire arc additive manufactured super duplex stainless steel

LI Ke; NIU Ben; PAN Linlin; YI Jianglong; ZOU Xiaodong

doi:10.12073/j.hjxb.20221214003

TRANSACTIONS OF THE CHINA WELDING INSTITUTION > 2023 > 44(10): 94-101. > DOI: 10.12073/j.hjxb.20221214003

LI Ke, NIU Ben, PAN Linlin, YI Jianglong, ZOU Xiaodong. Effect of heat input on microstructure and mechanical properties of wire arc additive manufactured super duplex stainless steel[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2023, 44(10): 94-101. DOI: 10.12073/j.hjxb.20221214003

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Effect of heat input on microstructure and mechanical properties of wire arc additive manufactured super duplex stainless steel

LI Ke^{1, 2,},
NIU Ben¹,
PAN Linlin^1, ,,
YI Jianglong¹,
ZOU Xiaodong¹

1.
Key Laboratory of Modern Welding Technology of Guangdong Province, China-Ukraine Institute of Welding, Guangdong Academy of Sciences, Guangzhou, 510651, China
2.
Department of Intelligent Manufacturing, Wuyi University, Jiangmen, 529030, China

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Received Date: December 13, 2022
Available Online: August 22, 2023

Graphical Abstract

Abstract

Abstract

In order to investigate the influence of heat input on the microstructure and properties of wire arc additive manufactured super duplex stainless steel, sample tests were conducted by MIG arc additive manufacturing of a sing-wall on a substrate of Q345 low carbon alloy steel, using ER2594 super duplex stainless steel wire 1.2 mm in diameter with different heat inputs applied. The microstructure and mechanical properties of each sample were analyzed. The results showed that when the heat input was increased from 435.6 J/mm to 517.3 J/mm, the austenite content grew from 31% to 43%, which was attributed to the greater heat input and the slower cooling rate. When the heat input was further increased to 599.0 J/mm, the austenite content decreased from 43% to 41% due to the loss of nitrogen content. With continuous increase of heat input (from 435.6 J/mm to 599.0 J/mm), the microhardness was initially decreased and then increased, since microhardness is positively correlated with ferrite content. The sample with a intermediate heat input value (517.3 J/mm) exhibited better tensile performance due to its high austenite content.
- super duplex stainless steel,
- heat input,
- wire arc additive manufacturing,
- nitrogen element,
- austenite content

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References (23)

References

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Effect of heat input on microstructure and mechanical properties of wire arc additive manufactured super duplex stainless steel