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Surface Roughness of Laser Modified Die Surface Change Under Thermal Cyclic Loading

机译：热循环加载下激光改性模具表面变化的表面粗糙度

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Thermal fatigue crack results in decrease of die service life has brought to a significant loss in the die casting industry due to the high cost of die. Laser surface modification is proposed in this study to enhance the surface properties of die and increase the resistance of thermal crack. In this study, the changes of surface roughness of laser modified die surface were investigated during thermal cyclic loading. H13 tool steel samples were sectioned while the surface of the samples were laser modified at different parameters. Laser modified samples were subjected to thermal cyclic loading by continuously heating in molten aluminium and cooling in water bath at respective temperature range of 850-900°C and 27°C. The results of surface roughness and morphology were obtained using a display optical microscope after 3000, 4000 and 5000 cycles of thermal cyclic loading. The surface roughness of laser modified tool steel with hardness properties of 745 HV experienced the least changes throughout the thermal cyclic loading process. The minimal changes of surface roughness on the laser modified die reduces the formation of the oxide layer and thus reduces the thermal fatigue of die casting dies.
机译：由于死亡成本高，模具使用寿命导致模具使用寿命减少导致模具使用寿命的显着损失。在该研究中提出了激光表面改性，提高了模具的表面性质并增加了热裂纹的电阻。在该研究中，在热循环载荷期间研究了激光改性模拟表面的表面粗糙度的变化。 H13刀具钢样品在不同参数下激光改性样品的表面。通过在850-900℃和27℃的相应温度范围内连续加热激光改性样品通过在熔融铝中连续加热，在水浴中冷却。使用3000,4000和5000循环的热循环载荷后，使用显示光学显微镜获得表面粗糙度和形态的结果。激光改性工具钢的表面粗糙度具有745HV的硬度特性，在整个热环循环加载过程中经历了最少的变化。激光改性模具上的表面粗糙度的最小变化降低了氧化物层的形成，从而降低了压铸模具的热疲劳。

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