Design of Interface Transition Layers for Dissimilar Metals of Martensitic Heat-resistant Steel and Nickel-based Alloy

GAO Jianfei; FU Jia; XIA Meiling; MU Lang; YU Yunhe; HOU Jixin; XIA Zhixin

doi:10.3969/j.issn.1674-6457.2026.02.006

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Journal of Netshape Forming Engineering ›› 2026, Vol. 18 ›› Issue (2) : 60-72. DOI: 10.3969/j.issn.1674-6457.2026.02.006

Process Technology in the Ordnance Industry

Design of Interface Transition Layers for Dissimilar Metals of Martensitic Heat-resistant Steel and Nickel-based Alloy

GAO Jianfei¹, FU Jia¹, XIA Meiling², MU Lang², YU Yunhe^2,*, HOU Jixin², XIA Zhixin²

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Abstract

In response to the demand for high-quality bonding of martensitic heat-resistant steel/ nickel-based alloy in the field of ultra supercritical thermal power, the work aims to design the composition of the transition layer, and explore the effects of alloy systems and element diffusion on the microstructure and properties. Taking the resistance of high temperature and corrosion into account, and combining with solid solution criteria such as ratio parameter-atomic size difference (Ω-δ), mixing enthalpy (∆H_mix), and valence-electron concentration (VEC), the FeNiCr transition layer was preliminarily screened. The diffusion effects of Fe, Ni, and Cr elements on the phase equilibrium, physical properties, and mechanical properties of G115 martensitic heat-resistant steel and 617B nickel-based alloy were simulated with JMatPro. The calculation results indicated that the FeNiCr alloy was more likely to form a simple solid solution with face-centered cubic (FCC) structure. The diffusion of Cr element caused the disappearance of M₆C phase in G115 steel, and the formation of the σ phase was induced when the Cr content reached 9%. Fe diffusion promoted the formation of MC phases in 617B alloy, whereas Cr diffusion eliminated the M₆C phase and resulted in the appearance of MC phases. Additionally, the diffusion of Ni element significantly affected the coefficient of thermal expansion and mechanical properties of G115 steel. The diffusion of Fe element led to a decrease in the mechanical properties of 617B alloy, and the diffusion of Cr element improved the hardness and strength of 617B alloy. In conclusion, the transition layer of FeNiCr alloy can achieve infinite solid solution of Fe and Ni elements, while achieving a smooth transition of interface composition gradient. The gradient distribution of physical properties can be formed and mechanical properties can be improved by controlling element diffusion, providing important theoretical reference for the design and performance optimization of dissimilar metal interfaces of martensitic heat-resistant steel and nickel-based alloy.

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GAO Jianfei, FU Jia, XIA Meiling, MU Lang, YU Yunhe, HOU Jixin, XIA Zhixin. Design of Interface Transition Layers for Dissimilar Metals of Martensitic Heat-resistant Steel and Nickel-based Alloy[J]. Journal of Netshape Forming Engineering. 2026, 18(2): 60-72 https://doi.org/10.3969/j.issn.1674-6457.2026.02.006

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