Design of T22/800H transition joints through thermodynamic and kinetic modeling

Chenxv Zhou; Zidong Lin; Zhen Sun; Xinghua Yu

doi:10.1117/12.2638592

20 September 2022 Design of T22/800H transition joints through thermodynamic and kinetic modeling

Chenxv Zhou, Zidong Lin, Zhen Sun, Xinghua Yu

Proceedings Volume 12261, International Conference on Mechanical Design and Simulation (MDS 2022); 1226133 (2022) https://doi.org/10.1117/12.2638592
Event: Second International Conference on Mechanical Design and Simulation (MDS 2022), 2022, Wuhan, China

Abstract

When T22 ferritic steel and 800H austenitic alloy were welded, premature failures often appear on the heat-affected zone side of ferritic steel, due to carbon migration. The carbon chemical potential gradient is the driving force of carbon diffusion. Usually, adding a transition layer between dissimilar alloys is an effective way to reduce the chemical potential gradient. Therefore, in this study, thermodynamic and kinetic modeling tools were used for designing transition layers between T22 and 800H to mitigate carbon migration. Firstly, simulation results show that a linear transition zone can decrease the migration of carbon to reduce the decomposition of carbide on the T22 side. In addition, two layers transition was designed to further depress carbon migration. Compared with the wider linear transition zone, it can gain a similar favorable effect. Moreover, the width of the transition zone can be significantly minimized. The designed constant composition is propitious to drop the experiment complexity.

Citation Download Citation

Chenxv Zhou, Zidong Lin, Zhen Sun, and Xinghua Yu "Design of T22/800H transition joints through thermodynamic and kinetic modeling", Proc. SPIE 12261, International Conference on Mechanical Design and Simulation (MDS 2022), 1226133 (20 September 2022); https://doi.org/10.1117/12.2638592

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KEYWORDS

Carbon

Diffusion

Metals

Interfaces

Thermodynamics

Homogenization

Chemical analysis

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