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  1. foundry1

    Charpy testing CD4MCuN castings

    My customer is going to buy the castings but cannot use them as upgrades for their current order. I am going to duplicate this order to meet their upgrade requirement but pour plenty of test blocks with each heat so this doesn't happen again. Any suggestions on a good reliable ISO qualified...
  2. foundry1

    Charpy testing CD4MCuN castings

    NO
  3. foundry1

    Charpy testing CD4MCuN castings

    Thanks for your responses. The material specification is A995 Grade 1B. Nitrogen content was from .23 to .25% The lab work was done by a Bodycote lab in California. The metallurgy results for the four heats read as follows: "Ferite-point count conforms, Exhibits 45.27%* ferrite. Etch/Mag...
  4. foundry1

    Charpy testing CD4MCuN castings

    GRoberts, Thanks for your response. I've discovered that three of these heats had slightly elevated carbons, max C was .047. What bearing could this have on these Charpy results or the microstructure? Foundry1
  5. foundry1

    Charpy testing CD4MCuN castings

    We are looking for a 3-sample result with a minimum average of of 45J and minimum individual of 36J. Temperature is -10C. There were 4 heats sampled. The following chart displays the mechanical results along with the average of each charpy tests. HRB YIELD TEN. ELONG RA...
  6. 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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