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Taking the given S43CMnV non‐quenched and tempered steel multi‐cylinder (3‐cylinder and 4‐cylinder) crankshaft as the research object, the intrinsic relationship between the forging process, temperature controlled cooling process of 3‐cylinder crankshaft and the global‐local grain evolution process was analyzed by Deform‐3D software. Meanwhile, the influence relationship between average grain sizes...