45~#钢表面激光熔覆自熔性镍基碳化钨粉末
发布时间：2018-11-10 20:49
【摘要】：目的提高45#钢的表面性能。方法利用IPG光纤激光加工系统,采用不同的工艺参数在45#钢表面激光熔覆自熔性镍基碳化钨粉末,对熔覆层的宏观表面(平整度、表面硬度、裂纹情况)及金相组织、显微硬度分布进行对比分析。结果在激光功率为1200 W、扫描速度为2 mm/s、送粉电压为7 V时,获得的熔覆层宏观表面相对平整光滑,平均洛氏硬度约是基体的2.5倍。由微观组织分析得知,熔覆层及界面处无裂纹、气孔等缺陷,熔覆层中上部组织晶粒细小,沿熔覆层与基体交界处向外,晶粒呈现柱状晶及等轴晶,组织性能良好,基体与熔覆层间冶金结合比较牢固。熔覆层显微硬度分布比较均匀,并且与基体相比提高了约1.5倍。结论 45#钢表面机械性能得到提升,在其表面激光熔覆自熔性镍基碳化钨粉末具有可行性和研究价值。
[Abstract]:Objective to improve the surface properties of 4 # steel. Methods by using IPG optical fiber laser processing system, laser cladding nickel based tungsten carbide powder with different technological parameters was used on the surface of 4steel. The macroscopic surface (smoothness, surface hardness, crack) and metallographic structure of the cladding layer were studied. The microhardness distribution was compared and analyzed. Results when the laser power is 1200 W and the scanning speed is 2 mm/s, the macroscopic surface of the cladding layer is relatively smooth and smooth, and the average Rockwell hardness is about 2.5 times of that of the substrate. The microstructure analysis shows that there are no cracks, pores and other defects in the cladding layer and the interface, and the microstructure of the upper part of the cladding layer is fine, along the interface between the cladding layer and the matrix, the grain appears columnar and equiaxed crystal, and the microstructure and properties are good. The metallurgical bond between the matrix and the cladding is relatively strong. The microhardness distribution of the cladding layer is uniform and 1.5 times higher than that of the substrate. Conclusion the mechanical properties of 4steel surface have been improved, and laser cladding self-fluxing nickel base tungsten carbide powder on its surface is feasible and valuable.
【作者单位】： 辽宁工业大学机械工程与自动化学院;日照港油品码头有限公司;
【基金】：国家科技支撑计划项目(2012BAF12B08-5)~~
【分类号】：TG174.4
[Abstract]:Objective to improve the surface properties of 4 # steel. Methods by using IPG optical fiber laser processing system, laser cladding nickel based tungsten carbide powder with different technological parameters was used on the surface of 4steel. The macroscopic surface (smoothness, surface hardness, crack) and metallographic structure of the cladding layer were studied. The microhardness distribution was compared and analyzed. Results when the laser power is 1200 W and the scanning speed is 2 mm/s, the macroscopic surface of the cladding layer is relatively smooth and smooth, and the average Rockwell hardness is about 2.5 times of that of the substrate. The microstructure analysis shows that there are no cracks, pores and other defects in the cladding layer and the interface, and the microstructure of the upper part of the cladding layer is fine, along the interface between the cladding layer and the matrix, the grain appears columnar and equiaxed crystal, and the microstructure and properties are good. The metallurgical bond between the matrix and the cladding is relatively strong. The microhardness distribution of the cladding layer is uniform and 1.5 times higher than that of the substrate. Conclusion the mechanical properties of 4steel surface have been improved, and laser cladding self-fluxing nickel base tungsten carbide powder on its surface is feasible and valuable.
【作者单位】： 辽宁工业大学机械工程与自动化学院;日照港油品码头有限公司;
【基金】：国家科技支撑计划项目(2012BAF12B08-5)~~
【分类号】：TG174.4
【参考文献】
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