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Influence of the HPDL surface treatment of the X40CrMoV5-1 and 32CrMoV12-28 tool steels on wear resistance

Jonda E., Labisz K., Pakieła W.

Archives of Materials Science and Engineering

2013

Vol. 64, nr 2

152--159

Purpose: This paper presents the results of laser remelting influence on structure and properties of the surface of the X40CrMoV5-1 and 32CrMoV12-28 hot work tool steels, carried out using the high power diode laser (HPDL). Structure changes were determined in the work, especially structure fragmentation. Also hardness investigation of the different remelting areas was performed. The purpose of this work was also to determine technological and technical parameters for a right performed HPDL remelting process. Boron nitride powder was used for alloying. The goal of this work was also to determine technical and technological conditions for remelting the surface layer with HPDL. Design/methodology/approach: Here are discusses the new methodology ways which can be applied in case of improving of the surface layer properties. A new laser treatment techniques applied in metal surface technology is here the most important feature. Also the influence of ceramic powders to the structure in all zones is investigated. Optical and scanning electron microscopy, EDS point wise and area microanalysis was used to characterize the microstructure and to investigate the intermetallic phases occurred. Findings: The most important factor is the zone structure of the surface layer which was coming into existence without cracks and defects as well as has a considerably higher hardness value compared to the non remelted material. It was find out, that the hardness of the alloyed surface layer increases according to the applied laser power. The highest power applied gives the highest hardness value in the remelted layer mostly in all user ceramic powders. Practical implications: The reason of this work was also to determine the laser treatment parameters, particularly the laser power, to achieve a good layer hardness for protection of this hot work tool steel from losing their work stability and to make the tool surface more resistant for work extreme conditions. The most important practical implication investigated in this work improves the appliance of HPDL laser for alloying and remelting of hot work tool steel. Originality/value: The originality of this work is assured through the using of an high-level up-to-date laser device for improvement of steel surface layer mechanical properties.