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.
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
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)
关键词
球墨铸铁
激光相变硬化
针状马氏体
ductile cast iron
laser transformation hardening
acicular martensites
