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The NACE standard MR0175 requires that the HAZ hardness of AISI 8630 steel overlaid with Ni-base Alloy 625 cannot exceed 250 VHN, requiring a postweld heat treatment (PWHT) to decrease the as-welded HAZ hardness. However, PWHT results in the diffusion of carbon from the steel into the overlay and may lead to interface embrittlement. To understand the effect of PWHT on the microstructure and hardness...
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