Microstructure and corrosion properties of 625 Ni-based alloy surfacing layer on the inner-wall material by twin tungsten electrode TIG welding with heat wire

PU Juan; SHI Sutong; WEI Hongbing; WU Mingfang; SUN Huawei; LONG Weimin

doi:10.12073/j.hjxb.20240207001

TRANSACTIONS OF THE CHINA WELDING INSTITUTION > 2025 > Accepted Manuscript > DOI: 10.12073/j.hjxb.20240207001

PU Juan, SHI Sutong, WEI Hongbing, WU Mingfang, SUN Huawei, LONG Weimin. Microstructure and corrosion properties of 625 Ni-based alloy surfacing layer on the inner-wall material by twin tungsten electrode TIG welding with heat wire[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION. DOI: 10.12073/j.hjxb.20240207001

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Microstructure and corrosion properties of 625 Ni-based alloy surfacing layer on the inner-wall material by twin tungsten electrode TIG welding with heat wire

1.
School of Intelligent Manufacturing and Control Engineering, Shanghai Polytechnic University, Shanghai , 201209, China
2.
School of Materials Science and Engineering, Jiangsu University of Science and Technology, Zhenjiang , 212003, China
3.
Ningbo Intelligent Machine Tool Research Institute Co., Ltd., China National Machinery Institute Group, Ningbo, 315700, China
4.
Zhengzhou Research Institute of Mechanical Engineering, Zhengzhou, 450001, China

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Received Date: February 06, 2024
Available Online: April 01, 2025

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Abstract

Abstract

Two Inconel 625 Ni-based alloy surfacing layers were prepared on the inner wall of high-strength steel in oil pipeline by using double tungsten electrode TIG technology with hot wire which controlled by independent power supplication. The samples obtained from the oil pipeline were solution treated at the temperature of 800 ℃and 900 ℃, respectively. The microstructure and composition of Ni/steel surfacing plate were analyzed by optical microscope (OM) and scanning electron microscope (SEM). Its hardness and electrochemical corrosion were tested and its passivation film was analyzed by X-ray photoelectron spectroscopy (XPS). The results showed that in the as-welded state, the first layer of Ni-based surfacing alloy grew upwards in order perpendicular to the steel, however, the second layer nucleated with substrate and precipitates in the substrate of the first layer alloy, and its growth sequence became chaotic. Meanwhile, the grain size of the first layer was smaller than that of the second layer owing to the heat effect of the second layer on the first layer. After solid solution treatment, the microstructure of HAZ changed more uniform and refined compared to that in the as-welded state, and this can improve the strength and toughness of the Ni/steel interface. In the as-welded state, The microstructure of Ni/steel surfacing composite plate presents a gradient distribution, which shows that the Ni/steel surfacing layer (220 HV) is significantly higher than that of the high strength steel substrate (140 HV), and the steel matrix HAZ has the lowest hardness (100 HV) due to the microstructure softening caused by the welding heat cycle.. The process of solid solution treatment can increase the corresponding hardness, especially, when the solid solution treatment temperature was 800 ℃, secondary Ni-based austenite γ" phase, whose dislocation density was large, started to form, thus the hardness value of Ni-based alloy was up to the maximum. Moreover, when the solution treatment temperature was 800 ℃, the dissolution of Nb and Mo elements increased, the Laves phase and carbide phase reduced, and the needle-like δ phase appeared, thus the corrosion resistance of Ni-based alloy reached the optical value. The passivation film was composed of two layers that the inner layer consisted of Cr, Fe, Nb, Mo oxides and the outer layer consisted of Cr, Fe, Nb, Mo hydroxide.

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Microstructure and corrosion properties of 625 Ni-based alloy surfacing layer on the inner-wall material by twin tungsten electrode TIG welding with heat wire

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