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Meeting 11th Conference on Trends in Welding Research + Additive Manufacturing (TWR+AM)
Symposium 11th Conference on Trends in Welding Research + Additive Manufacturing (TWR+AM)
Presentation Title An Engineering Approach for Weld Creep Lifetime Assessment Based on Local Property Measurement
Author(s) Wei Zhang, Yiyu Wang, Yanli Wang, Zhili Feng
On-Site Speaker (Planned) Wei Zhang
Abstract Scope Localized creep failure in the heat-affected zone (HAZ) is a primary life-limiting factor for Grade 91 steel weldments in advanced power plants. This study proposes a novel engineering assessment approach that integrates local properties of the heterogeneous HAZ to improve creep lifetime predictions. To quantify local properties, creep tests were conducted on simulated HAZ specimens using in-situ Digital Image Correlation. A physical constitutive model was developed to investigate local deformation and damage accumulation, incorporating cavity nucleation and growth via grain boundary diffusion and creep deformation. This framework establishes a fundamental link between local material properties, strain accumulation, cavitation characteristics, and creep life. When applied to ex-service 9% Cr steel weldments, the model effectively evaluated the impact of service-induced damage on remaining useful life. Results show quantitative agreement with experimental data for both local creep deformation and remaining useful life across various test conditions.
Proceedings Inclusion? Undecided

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