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Residual stress and creep strain analysis of Inconel 718 and stainless steel 316 welds

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Abstract

Numerical simulation is implemented to study the generation of residual stress and creep behavior for different kinds of welded joints of 316 stainless steel and Inconel 718 base alloys with Inconel 625 as filler alloy. Residual stress is numerically calculated by executing mechanical analysis followed by thermal analysis. It is difficult to validate residual stress generation with experimental results; therefore, the temperature verification method can be employed. The cooling rate has been determined using Newton’s law of cooling considering convective heat transfer across the welded specimen. Time hardening creep law is formulated and implemented to simulate the creep behavior of the weld joints for 1-h time duration. Parallel butt weld is found to be more unscathed as a very low amount of residual stress generation is observed across the weld bead. On the contrary, a large amount of residual stress is observed along the weld bead for T weld joint. Primary and secondary creep stages are observed for 1-h time duration in all types of butt weld joints studied here. In addition, the tertiary creep stage is only observed for lap and T weld joints. The T weld joint shows minimum primary and secondary creep and very large tertiary creep behavior, thereby providing a very high possibility of failure under creep loading conditions. Parallel butt weld joint unveils a very low amount of creep strain compared to creep strain generated in others welded.

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Acknowledgements

The authors acknowledge support from the National Institute of Technology Rourkela, India, for providing computational resources and ANSYS software for simulation and numerical analysis.

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Authors and Affiliations

  1. Department of Mechanical Engineering, Birla Institute of Technology and Science Pilani, Dubai Campus, International Academic City, P.O. Box 345055, Dubai, United Arab Emirates, UAE

    Ravindra Giriraj Bhardwaj

  2. Computational Materials Engineering Group, Metallurgical and Materials Engineering Department, National Institute of Technology Rourkela, Rourkela, Odisha, 769008, India

    Ravindra Giriraj Bhardwaj & Snehanshu Pal

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  1. Ravindra Giriraj Bhardwaj
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Correspondence to Ravindra Giriraj Bhardwaj.

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Recommended for publication by Commission X - Structural Performances of Welded Joints - Fracture Avoidance

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Bhardwaj, R.G., Pal, S. Residual stress and creep strain analysis of Inconel 718 and stainless steel 316 welds. Weld World 68, 289–305 (2024). https://doi.org/10.1007/s40194-023-01648-7

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