摘要
利用激光数控加工机对65Mn钢进行表面相变硬化加工,研究激光功率、扫描速度和光斑直径对硬化层深度的影响规律。结果表明,激光处理后,相变区横截面显微组织为月牙形,晶粒较细密。单因素试验结果表明:随着激光功率的增加,硬化层深度增加;随着扫描速度的增加,硬化层深度变浅;随着光斑直径的增加,硬化层深度变浅。二次回归正交旋转组合试验结果表明:影响硬化层深度的因素主次顺序为:激光功率>扫描速度>光斑直径。优化确定出硬化层深度最大时的工艺参数组合为:激光功率为1200 W,扫描速度为900 mm/min,光斑直径为4 mm,硬化层深度为550μm。
Surface of 65Mn steel was hardened by a laser numerical control machine. The influence of laser power, scanning velocity and spot diameter on hardened layer depth of the 65Mn steel was investigated. The results show that the transformation zone is crescent- shaped, and its grains are fine after laser treatment. The hardened layer depth increases with increasing the laser power, and the thinner hardened layer depth is observed at higher scanning velocities and larger laser spot diameters. The test result by quadratic orthogonal rotatory combination design indicates that laser power is the key factor on the hardened layer depth, and the effect of spot diameter is slightly. The hardened layer depth of 550 μm is obtained when laser power is 1200 W, scanning velocity is 900 mm/min and spot diameter is 4 mm.
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2015年第9期213-218,共6页
Transactions of Materials and Heat Treatment
基金
黑龙江省自然科学基金(E201132)
黑龙江省农垦总局科研项目(HNK10A-09-02-04)
黑龙江八一农垦大学引进人才科研启动基金(2011)
关键词
65MN钢
激光相变硬化
工艺参数
硬化层深度
65Mn steel
laser transformation hardening
process parameter
hardened layer depth
