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本文在厚度为 0 .5— 2 .0mm的 5Cr4Mo3SiMnVAl(0 12Al)模具钢和Cr12MoV模具钢薄板上 ,采用脉冲Nd :YAG激光进行了激光熔凝实验 ,研究了工艺参数 (脉冲宽度和脉冲频率 )、材质和材料厚度对激光熔凝后熔凝层显微硬度特征的影响。结果表明 :随着脉冲宽度的增加或脉冲频率的减少 ,激光熔凝区的显微硬度有减少的趋势 ;Cr12MoV模具钢的激光熔凝区的显微硬度比 0 12Al模具钢的低 ;随着材料厚度的增加 ,激光熔凝区的显微硬度表现为先增加后减少的趋势。激光熔凝工艺参数、材料的热扩散情况和材料的热物性参数的不同是造成上述现象的主要原因。
In this paper, laser cladding experiments were carried out on 5Cr4Mo3SiMnVA1 (0 12Al) and Cr12MoV mold steel sheets with thickness of 0.5-2.0mm. The effects of process parameters (pulse width and pulse frequency) , Material and material thickness of the laser fused fused layer microhardness characteristics. The results show that with the increase of pulse width or the decrease of pulse frequency, the microhardness of the laser melting zone tends to decrease. The microhardness of the laser melting zone of Cr12MoV mold steel is lower than that of the 012Al tool steel. With the increase of material thickness, the microhardness of the laser fusion zone first increases and then decreases. Laser welding process parameters, the thermal diffusion of materials and thermal properties of the material is the main reason for the above phenomenon.