电加工与模具
電加工與模具
전가공여모구
ELECTROMACHINING & MOULD
2013年
4期
43-45,55
,共4页
激光熔覆%负离焦%稀释率
激光鎔覆%負離焦%稀釋率
격광용복%부리초%희석솔
laser cladding%negative defocussing%rate of dilution
高斯激光束传播对激光熔覆质量有显著影响。为探索高斯光束传播对覆层几何形貌、结合质量及稀释率的影响，以Fe901+5%Cr3C2熔覆材料为研究对象，对高斯光束不同离焦区域进行了激光熔覆工艺实验，对比了正、负离焦工艺。利用金相显微镜对熔覆层几何形貌、微观结构进行分析，并对显微硬度分布进行测试与对比。结果显示，采用负离焦工艺进行激光熔覆，可获得稀释率较低，边缘良好冶金结合，无未熔颗粒、缺陷的覆层，覆层显微硬度在900～1000 HV0.2。
高斯激光束傳播對激光鎔覆質量有顯著影響。為探索高斯光束傳播對覆層幾何形貌、結閤質量及稀釋率的影響，以Fe901+5%Cr3C2鎔覆材料為研究對象，對高斯光束不同離焦區域進行瞭激光鎔覆工藝實驗，對比瞭正、負離焦工藝。利用金相顯微鏡對鎔覆層幾何形貌、微觀結構進行分析，併對顯微硬度分佈進行測試與對比。結果顯示，採用負離焦工藝進行激光鎔覆，可穫得稀釋率較低，邊緣良好冶金結閤，無未鎔顆粒、缺陷的覆層，覆層顯微硬度在900～1000 HV0.2。
고사격광속전파대격광용복질량유현저영향。위탐색고사광속전파대복층궤하형모、결합질량급희석솔적영향，이Fe901+5%Cr3C2용복재료위연구대상，대고사광속불동리초구역진행료격광용복공예실험，대비료정、부리초공예。이용금상현미경대용복층궤하형모、미관결구진행분석，병대현미경도분포진행측시여대비。결과현시，채용부리초공예진행격광용복，가획득희석솔교저，변연량호야금결합，무미용과립、결함적복층，복층현미경도재900～1000 HV0.2。
The effect of Gauss beam propagation on the quality of laser cladding coating is dramatic, which includes sectional geometric pattern, bonding quality and rate of dilution of laser cladding layer. For exploring all above influences, the experiments of laser cladding in different defocused zone of Gauss beam were made, especially, the positive defocused zone and negative defocused zone were investigated, and Fe901+5 %Cr3C2 was used as cladding material. By using metallographic microscope, the sectional geometric pattern and microstructure of coating were analysed in detail. Then, the microhardness distribution of each coating were tested and compared. The research showed that laser cladding layer in negative defocussing of Gauss beam had better properties such as low rate of dilution, good metallurgical bonding with base metal, and there is no unmelted metal particle and defect at the edge of coating. The microhardness of cladding zone was 900~1000 HV0.2.
