October 10, 2025

Stress Relaxation Cracking and the Curious Case of the Uncracked Welds SRC Mechanisms Part II

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This paper reveals stress relaxation cracking mechanisms in welds, highlighting interaction between residual stress and creep ductility.

Stress relaxation cracking (SRC) occurs primarily in welds subjected to high residual stress and low ductility at elevated temperatures.
The proposed model attributes SRC to creep cavitation influenced by residual stress and conditions like grain boundaries and cold forming.
Despite effective stress relaxation in most welds, triaxial states increase susceptibility to SRC due to limited dislocation movement.
Mitigation strategies include post-weld heat treatment, though some damage accumulation may still occur, affecting component lifespan.

J.W. Rensman (2025) studied this question.

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