Alloy 600, a nickel-chromium alloy, has an outstanding corrosion resistance with excellent fabricability and is used in light water reactors at elevated temperatures. The alloy is also being considered for an advanced reactor concept because of its high allowable design strength at the elevated temperature. Alloy 600 is a power hardening material and basic plastic properties of the alloy are changed in the welded zone due to inhomogeneity in weld joints. The extended finite element method (XFEM) is used when the problem of variations invariably in the stress intensity factors (K) at a different instant rate exists. This paper focuses on the effect of variations in macrostructural properties of the alloy on stress corrosion cracking plastic zone ahead of the crack-tip using XFEM. To control the variations in the K, a new technique is also introduced in this research. The results show that the plastic zone is affected by K (increases with the increase of K), yield strength (plastic zone decreases with the increase in yield strength), and hardening exponent “n” (core region increases with the increase of exponent) of the materials. Simulations were performed and results are compared with experimental data.

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