薄板模具钢脉冲Nd:YAG激光熔凝区显微硬度特征的影响因素  

Influences on microhardness characteristics of pulsed Nd:YAG laser remelting zone of thin plate die steel

作　　者：黄开金[1] 谢长生[1] 许德胜[2] 

机构地区：[1]华中科技大学国家模具重点实验室 [2]华中科技大学国家激光技术重点实验室,武汉430074

出　　处：《应用激光》2004年第6期365-367,354,共4页Applied Laser

摘　　要：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。Laser remelting of thin plate, made of 5Cr4Mo3SiMnVAl(012Al) die steel and Cr12MoV die steel with thickness of 0.5mm to 2.0mm, 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 microhardness characteristics of laser remelting zone were studied. The results show that the microhardness of laser remelting zone decreases with the increase of pulsed width or the decrease of pulsed frequency, and the microhardness of laser remelting zone of Cr12MoV die steel is lower than that of 012Al die steel, and the microhardness of laser remelting zone increases at first and decreases then with the increase of materials thickness. The main reasons are the differences of laser remelting technical parameters, the dissipated heat case of materials and the thermophysical properties of materials.

关 键 词：激光熔凝 模具钢 显微硬度 CR12MOV 薄板 脉冲频率 工艺参数 脉冲ND:YAG激光 增加 影响因素 

分 类 号：TN249[电子电信—物理电子学] TG156.99[金属学及工艺—热处理]