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  1. foundry1

    Charpy testing CD4MCuN castings

    I am looking for the causes of low Charpy test results for ASTM A995 gr 1B (CD4MCuN) castings. All other mechanical & metallurgical results meets requirements but the Charpy results are 50% below the acceptance criteria. I know the problem is in heat treat (SA + WQ) but I am not exactly sure...

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