Microstructure Modification of Tool Steel X38CrMoV5-1 by Fibre Laser

Abstract:

In the present work, we investigate the influence of laser radiation on the evolution of microstructure and wear resistance of X38CrMoV5-1 tool steel in hardened and tempered condition. The microstructure of the laser surface hardened zone consists of fine and coarse grained carbides (M₂₃C₆, M₇C₃, MC or M₂C) which are dispersed within martensite matrix. On the other hand, the laser melted microstructure is characterized by martensite, retained austenite and fine carbides precipitated in the inter-dendritic zone. The laser surface affected zone microstructure exhibits the enhanced hardness in the range from 857 to 775 HV in comparison with quenched and tempered conditions (720-655 HV) and decreases from the surface to the soft zone with a typical hardness of 530 HV. The wear resistance of the laser treated samples is investigated by “ball on disc” method, which shows a significant improvement as compared to that in quenched and tempered condition.

• Periodical: Materials Science Forum (Volume 891)
• Pages: 171-175
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.891.171
• Online since: March 2017
• Authors: Martin Šebek*, František Kováč, Ivan Petryshynets, Ján Balko
• Keywords: Hot Work Tool Steel, Laser Surface Hardening, Microhardness, Microstructure Evolution

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