Modification of AISI M2 high speed tool steels after laser surface melting under different operation conditions
DOI:
https://doi.org/10.3989/revmetalm.0918Keywords:
AISI M2 high speed steel, Nd, YAG laser, Laser melting, Hardness, WearAbstract
We applied a laser surface melting treatment to AISIM2 high-speed steel –hardened and tempered- and studied the resulting surface characteristics (microstructure) and mechanical behavior (hardness and wear performance). The steel was treated using a Nd:YAG continuous-wave laser with different operation conditions. The influence of the laser processing parameters on the single tracks and on melted surface layer obtained by multipass system with 50% overlap were studied. The microstructure for all conditions is formed byMC- and M2C-type carbides, martensite and retained austenite; the quantities of this phase depends on the operations conditions. It has been determined that low levels of power density and high speed scanning of the beam leads to greater homogeneity in the microstructure with high hardness values and wear resistance.
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