能量密度对皮秒激光清洗H13模具钢的表面形貌与性能影响

Effect of Energy Density on Surface Morphology and Properties of H13 Mold Steel via Picosecond Laser Cleaning

采用1064 nm皮秒光纤激光器,在5组不同的能量密度参数下对H13热作模具钢表面油污和锈迹等污渍进行激光清洗,结果表明:2 J/cm2和3 J/cm2能量密度的激光清洗效果最佳,可使清洗后的表面粗糙度Ra分别达到(1.1±0.3)μm和(1.5±0.5)μm,表面硬度分别提高到(256±3.8)HV和(256±2.9)HV,清洗后的物相主要包括VC、(Mo,Cr)6C、(Cr,Fe)7C3和(V,Cr)2C,同时EDS能谱测试结果表明模具表面的C、Mo、V、Cr元素含量增大。

Using a 1064-nm picosecond fiber laser,five different energy densities were designed to conduct laser cleaning experiments on oil and rust stains present on H13 hot die steel.The results show that energy densities of 2 J/cm2 and 3 J/cm2 have the best cleaning effect;the surface roughness Ra can reach(1.1±0.3)μm and(1.5±0.5)μm,respectively;and the surface hardness increases to(256±3.8)HV and(256±2.9)HV,respectively.The main phases after cleaning are VC,(Mo,Cr)6 C,(Cr,Fe)7 C3,and(V,Cr)2 C.In addition,the EDS results show that the contents of C,Mo,V,and Cr on the mold surface are increased.