Abstract
The influence of tempering temperature on the microstructure of powder metallurgy high‐speed steels (PM HSSs) PM20 is investigated by X‐ray diffraction, electron backscattering diffraction, and transmission electron microscopy. With the increasing of tempering temperature, the ratio of low angle grain boundaries decreases, while the volume fraction and size of M6C and VC carbides increase. The wear resistance of PM20 with different tempering temperatures is studied by reciprocating ball‐on‐flat methods. The wear properties of PM20 decrease gradually with the increasing of tempering temperature. The variation of wear properties is explained by the characteristic of the martensite matrix, carbides, and the misorientation angle of boundaries. All samples present a complex wear mechanism of abrasive wear and oxidation wear.
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