This paper presents the investigation results of laser alloying and the influence on structure and properties of the surface of the 32CrMoV12-28 hot work steel, 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 reason of this work was also to determine the laser treatment parameters, particularly the laser power, to achieve good work stability and to make the tool surface more resistant for work extremal conditions. Based on microstructural examinations of the obtained material, the distribution of the reinforcing ceramic particles in the hot work tool steel was revealed. Tungsten carbide WC powder was used for alloying. The remelted layers which were formed on the surface of the investigated hot work steel were examined metallographically and analyzed using a hardness testing machine.
Investigations include alloying the X38CrMoV5-3 hot-work tool steel surface layer with
the tungsten carbide, using the high power diode laser (HPDL). The tungsten carbide ceramic
particles of the medium grain size according to FSSS = 50 /m were introduced using the rotor
conveyer to improve the properties of the surface layer. The powder feed rate was set at the steady
level of 8.64g/min. Remelting and alloying were carried out several times in the laser power range
of 1.2 – 2.3 kW in the remelting/alloying, alloying/remelting sequences. The structural mechanism
was determined of gradient layer development, effect was studied of alloying parameters, gas
protection method, and powder feed rate on its mechanical properties, and especially on its
hardness, abrasive wear resistance, and roughness. Structure changes were revealed consisting, in
particular, in its refining, and also hardness and microhardness changes in comparizon to the nonremelted
steel. Examination results obtained with the EDX microanalysis, surface and linear
analysis of the chemical composition, as well as the X-ray qualitative phase analysis are presented.
The objective of the present work was to study the modification of the microstructure of
hot-work tool steels X40CrMoV5-1 and X38CrMoV5-3 during the surface modifying by means of
laser technology. This treatment aims to harden and alloy the steel surface which had been previously
coated with tungsten carbide (WC) and were introduced using the rotor conveyer to improve the
properties of the surface layer. The fine grained, dendritic structure occurs in the remelted and alloyed
zone with the crystallization direction connected with the dynamical heat abstraction from the laser
beam influenced zone. The fine grained martensite structure is responsible for the hardness increase
of the alloyed layer.
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