Mold Material Laser Surface Hardening Technology Research

Laser hardening is a new surface modification technology, which is conducive to grain refinement hardening layer, to the strengthening and improvement of the wear resistance for the metal materials.Papers with DL-HL-10000B carbon dioxide laser on 3Cr2W8V hot die steel and die steel Cr12MoV cold laser surface hardening treatment. Of quenching processes such as laser power, scanning speed, beam parameters such as size and overlap of the quenching rate of layer microstructure, case depth and hardness, the following conclusions:1. On 3Cr2W8V die steel, laser transformation hardening quenching optimal parameters are:3500W laser power,30mm×lmm laser spot, 0.8mm-0.85m/min laser scanning speed, 1mm-2mm overlap the laser spot size; by laser Transformation hardening quenching surface layer for the uniform quenching of ultrafine grained high dislocation density saturated with carbon martensite and residual austenite.2. On Cr12MoV die steel, laser transformation hardening quenching optimal parameters are:3500W laser power,30mm×lmm laser spot, laser scanning speed 0.8mm-0.85m/min, lmm-2mm overlap the laser spot size; by laser Transformation hardening quenching surface layer for the uniform quenching of ultrafine grained high dislocation density saturated with carbon martensite and residual austenite.3.3Cr2W8V die steel after quenching laser transformation hardening, surface hardness than the matrix by more than 1.5 times. Friction and wear experiments show that the surface layer of mild wear, the wear of abrasive wear only the furrows; untreated severe surface wear, the wear surface of adhesive wear, adhesive off pit there. Laser surface transformation hardening quenching wear weight loss decreased 50.12% compared with untreated surface4. Cr12MoV die steel after quenching laser transformation hardening, hardness treatment 1.5 times higher than the substrate, the wear resistance increased by 1 times higher than the matrix; friction and wear experiments show that the surface layer of minor wear, worn surface furrows only; not Handling severe surface wear, no wear and tear like laser treatment deep furrows, the occurrence of fatigue wear and the emergence of fatigue level.