*5.2. Resistance to Abrasion Wear*

The obtained abrasion resistance correlated with the measured hardness values. The wear resistance decreased with an increase in the tempering temperature for all the samples—the volume of worn material increased by 1.5–2 times for samples with a tempering temperature of 680 ◦C] in comparison with the raw part or after tempering at 240 ◦C. The values of wear resistance and hardness of additively manufactured specimens and the specimens that were additionally subjected to low tempering di ffer insignificantly (HRC of 46.25 and 46.2, correspondingly). However, they are slightly higher than the wear resistance of samples after traditional hardening and low tempering (HRC of 45.9). Considering that low tempering reduces residual stresses, heat treatment can be recommended for additively manufactured parts working for wear.

Analysis of the research results shows that, for complex-shaped parts made of corrosion-resistant steels by the laser powder bed fusion, it is promising to use heat treatment to improve mechanical characteristics and ultrasonic treatment in order to improve the surface quality in post-processing.

**Author Contributions:** Conceptualization, S.N.G. and M.A.V.; methodology, T.V.T. and S.K.S.; software, Y.A.M. and P.A.P.; validation, A.S.M. and S.K.S.; formal analysis, A.S.M. and A.A.F.; investigation, A.A.F., P.A.P. and Y.A.M.; resources, M.A.V., T.V.T.; data curation, A.A.O. and Y.A.M.; writing—original draft preparation, A.A.F. and S.K.S.; writing—review and editing, T.V.T. and A.A.O.; visualization, A.A.O. and P.A.P.; supervision, S.N.G.; project administration, S.N.G. and M.A.V.; funding acquisition, A.S.M. All authors have read and agreed to the published version of the manuscript.

**Funding:** This research was funded by the Russian Science Foundation, gran<sup>t</sup> number No. 20-19-00620.

**Acknowledgments:** The research was done at the Department of High-E fficiency Processing Technologies of MSTU Stankin.

**Conflicts of Interest:** The authors declare no conflict of interest. The funders had no role in the design of the study; in the collection, analyses, or interpretation of data; in the writing of the manuscript, or in the decision to publish the results.
