薄板模具钢脉冲Nd:YAG激光熔凝试样 变形量的测量

在厚度为0.3～0.8 mm的5Cr4Mo3SiMnVAl(012Al)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试样厚度方向上最大变形量的影响。结果表明，激光熔凝薄板模具钢所引起的变形相当严重，其最大弯曲变形量与材料厚度为同一个数量级；随着脉冲频率的减少或脉冲宽度的增加或材料厚度的减少，试样厚度方向上的最大弯曲变形量增大；Cr12MoV钢试样厚度方向上的最大弯曲变形量比012Al钢的大。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。

Deformation Measurement of Thin Plate Die Steel During Pulsed Nd:YAG Laser Remelting

Laser remelting of thin plate, made of 5Cr4Mo3SiMnVAl(012Al) die steel and Cr12MoV die steel with thickness of 0 3 mm to 0 8 mm, was carried out by the use of pulsed Nd:YAG laser. The effects of technical parameters such as pulsed width and pulsed frequency, materials and materials thickness on the deformation characteristics of thin plate were studied. The results show that the deformation of thin plate die steel during pulsed Nd:YAG laser remelting is quite serious and the value is the same as the amount of materials thickness, and the maximum deformation value of thin plate in the thickness direction increases with the increase of pulsed width or the decrease of pulsed frequency or the decrease of materials thickness, and the maximum deformation value of thin plate in the thickness direction of Cr12MoV die steel is bigger than that of 012Al die steel. The main reasons are the differences of laser remelting technical parameters, the dissipated heat case of materials and the thermophysical properties of materials and the thermophysical properties of materials.