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High-potential high-alloy tool steels (HATS) containing martensitic microstructure with undissolved hard phases are achieved by a number of complex heat treating cycles, predominantly tempering. This article focuses on three tempering treatments, namely, salt bath heat treatment, austenitizing, and vacuum heat treatment. It explains the result of these tempering processes with HSS M2 grade of HATS.

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Paul Beiss, 2015. "Heat Treatment of Secondary-Hardening High-Alloy Tool Steels", Powder Metallurgy, P. Samal, J. Newkirk

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