January 2022
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5 Citations
Steel Research International
The influence of tempering temperature on the microstructure of powder metallurgy high-speed steels (PM HSSs) PM20 is investigated by X-ray diffraction (XRD), electron backscattering diffraction (EBSD) and transmission electron microscopy (TEM). With the increasing of tempering temperature, the ratio of low angle grain boundaries (LAGBs) decreases, while the volume fraction and size of M6C and VC carbides increase. The wear resistance of PM20 with different tempering temperature 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 has been explained by the characteristic of martensite matrix, carbides and the misorientation angle of boundaries. All samples present a complex wear mechanism of abrasive wear and oxidation wear. This article is protected by copyright. All rights reserved.