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  1. DutchChen

    Forging induced martensite in AISI 4140?

    Dear all, Recently I got an analysis case on a forged product made of 4140. The sample was first induction heated to 950 degree C for about 3.5 minutes and then air cooled after forging. Material flow, which looks like white bands, are clearly observed after etching. However, the hardness of...

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