Cr12MoV钢小面积凸点和大面积光面的激光淬火工艺  

Laser quenching process for small area convex dots and large area smooth surface of Cr12MoV steel

作　　者：陈阳升 Chen Yangsheng(Sanming PNV Machinery Co.,Ltd.,Sanming Fujian 365009,China)

机构地区：[1]三明市普诺维机械有限公司,福建三明365009

出　　处：《金属热处理》2023年第11期203-210,共8页Heat Treatment of Metals

摘　　要：针对Cr12MoV钢不同形状的模具在热处理过程中遇到的一些工艺痛点,采用光纤激光器的激光设备分别对Cr12MoV钢大面积光面和小面积凸点的试验块进行表面淬火,研究不同形状模具的激光淬火工艺的差别。结果表明,两者的工艺有共同点也有不同点,共同点就是硬化层深度和硬度与激光加热温度成正比,与扫描速度成反比,但是温度过高或者速度过慢,都有可能产生表层过热甚至微熔的现象。由于受热面积和形状不同,它们的工艺参数会有较大差别,小面积凸点的最合适工艺参数是激光加热温度960℃、扫描速度250 mm/min;大面积光面最合适的工艺参数是激光加热温度1180℃、扫描速度250 mm/min,而且不可避免地会出现软带现象。这些结果有助于工艺人员在对不同形状的模具进行激光表面淬火处理时,根据实际需要选择合适的工艺参数。Aiming to solve some process pain points encountered during the heat treatment process of Cr12MoV steel molds with different shapes,differences in laser quenching processes were investigated for the large area smooth surface and small area convex dots on such molds by using the Cr12MoV steel tested blocks and fiber laser equipment.The results show that the two processes have similarities and differences.The common point is that the depth and hardness of the hardened layer are directly proportional to the laser heating temperature and inversely proportional to the scanning speed,while it is possible to cause overheating or even micro melting of the surface layer if the temperature is too high or the scanning speed is too slow.The difference is that,caused by the differences in heated areas and shape,their process parameters may vary significantly.The most suitable process parameters for the small area convex dots are laser heating temperature of 960℃and scanning speed of 250 mm/min,while for the large area smooth surface are 1180℃and 250 mm/min,and the occurrence of soft band phenomenon is inevitable for the latter case.Such research results are helpful for process personnel to choose appropriate process parameters according to actual needs when laser surface quenching is applied to molds with different shapes.

关 键 词：CR12MOV钢 小面积凸点 大面积光面 激光淬火 显微组织 显微硬度 

分 类 号：TG161[金属学及工艺—热处理]