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<p>Dissimilar welds used in high-temperature power plant components develop complex residual stresses, and the usefulness of post-weld heat treatment (PWHT) in relieving these stresses remains insufficiently understood. This study investigates the influence of PWHT on the relaxation of residual stress in a Grade 91–Inconel 82–316LN weldment using a combined experimental and numerical approach. The generalised plane strain (GPS) approach is employed for the numerical modelling. Through-thickness residual stresses are quantified using the deep hole drilling (DHD) and compared with finite element simulations incorporating elastic–plastic–creep behaviour. Results show that PWHT leads to partial stress relaxation, with compressive stresses developing in the Grade 91 region while tensile stresses remain in the Inconel 82 and 316LN regions. A stress reduction of up to 200&#xa0;MPa is observed in the weld metal, whereas the 316LN side exhibits only marginal change. In the Inconel 82 region, both DHD measurements and GPS predictions indicate a similar stress trend, with an approximate reduction of 100&#xa0;MPa after PWHT. Overall, the results demonstrate that PWHT leads to only partial stress relaxation in dissimilar metal welds, and that appropriate representation of out-of-plane constraint through the GPS formulation is essential for accurately predicting residual stress evolution. These findings underline the importance of incorporating reliable residual stress assessment in the life evaluation of dissimilar metal welds operating under high-temperature service conditions.</p>

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Studies on post-weld heat treatment for residual stress relaxation in grade 91–Inconel 82–316ln dissimilar weld joints

  • 期刊论文

  • 发表日期：

    2026年8月4日

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  • Anoop A. Pillai,
  • Harish Chandra Dey,
  • Ullissery Balan Jayadeep,
  • Kuttiparambil Vineesh,
  • Manas Mohan Mahapatra

摘要

Dissimilar welds used in high-temperature power plant components develop complex residual stresses, and the usefulness of post-weld heat treatment (PWHT) in relieving these stresses remains insufficiently understood. This study investigates the influence of PWHT on the relaxation of residual stress in a Grade 91–Inconel 82–316LN weldment using a combined experimental and numerical approach. The generalised plane strain (GPS) approach is employed for the numerical modelling. Through-thickness residual stresses are quantified using the deep hole drilling (DHD) and compared with finite element simulations incorporating elastic–plastic–creep behaviour. Results show that PWHT leads to partial stress relaxation, with compressive stresses developing in the Grade 91 region while tensile stresses remain in the Inconel 82 and 316LN regions. A stress reduction of up to 200 MPa is observed in the weld metal, whereas the 316LN side exhibits only marginal change. In the Inconel 82 region, both DHD measurements and GPS predictions indicate a similar stress trend, with an approximate reduction of 100 MPa after PWHT. Overall, the results demonstrate that PWHT leads to only partial stress relaxation in dissimilar metal welds, and that appropriate representation of out-of-plane constraint through the GPS formulation is essential for accurately predicting residual stress evolution. These findings underline the importance of incorporating reliable residual stress assessment in the life evaluation of dissimilar metal welds operating under high-temperature service conditions.