Abstract
1. It is recommended to use as parameters for calculating crack resistance the nominal stress intensity factors: KJ, determined by the method of the J-integral, taking crack growth into account, and Kδ, calculated according to the critical crack opening δc using the theoretical values of the rotational factor. The use of Kδ is preferable because of the conservativeness of the evaluation in the range of operating temperatures of heavy-duty hot-forging dies. 2. In regard to crack resistance in the range of the operating temperatures of forging dies, steel 5KhNM is better than steel 4Kh5V2FS.
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