球墨铸铁QT600-3激光相变硬化试验研究  

Study on laser transformation hardening of ductile cast iron QT600-3

作　　者：郭怡晖[1,2] 刘金水[2] 刘继常[1,3] 鄢锉[1] 颜丙功[1] 

机构地区：[1]湖南大学汽车车身先进设计制造国家重点实验室,湖南长沙410082 [2]湖南大学材料科学与工程学院,湖南长沙410082 [3]中南大学粉末冶金国家重点实验室,湖南长沙410083

出　　处：《材料热处理学报》2010年第5期118-122,共5页Transactions of Materials and Heat Treatment

基　　金：国家科技支撑计划(2007BAF29B01);广东省教育部产学研合作专项资金重点项目(2008A090400017);粤港关键领域重点突破项目(2007Z002)

摘　　要：采用CO2激光对模具材料球墨铸铁QT600-3进行激光相变硬化的试验研究。结果表明,在较大光斑直径,较低的激光功率密度,较低激光扫描速度的工艺条件下,激光扫描后的硬化层组织中含有较多的针状马氏体;硬化层表面的宏观硬度可达60HRC,为基体硬度的2.4倍,硬化层表面处的显微硬度随着扫描速度的减小而增大,随着激光功率的增大而增大。硬化层深度可达到0.95 mm,硬化层的深度随着扫描速度的增加而减小,随着激光功率的增加而略有增加。Laser transformation hardening of ductile cast iron QT600-3 was investigated experimentally. In the experiment, a CO2 laser unit was used. The experimental results show that great amounts of acicular martensite are obtained in the zone hardened with a fairly large laser beam diameter and consequentially low power density on the sample surface, under a lower scanning velocity of laser beam. The hardness of the hardened surface reaches up to 60 HRC, which is about 2.4 times as high as that of matrix. In addition, the microhardness of surface improves with increase of laser power and decrease of laser scanning velocity. The depth of hardened layer is up to 0.95 mm, and it decreases with increase of laser scanning velocity and increases a little with increase of laser power.

关 键 词：球墨铸铁 激光相变硬化 针状马氏体 

分 类 号：TG143.5[一般工业技术—材料科学与工程] TG164.2[金属学及工艺—金属材料]