Characterization of laser powder micro-deposition of thin StelliteF wall
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摘要: 为了直接制备出壁厚均匀的精细薄壁零件,试验研究了激光微沉积StelliteF合金粉末的工艺参数对壁厚均匀性及沉积过程稳定性的影响。通过对激光微沉积薄壁的截面组织及形貌的分析表明,沉积过程的热散失条件影响壁厚的均匀性;选择合适选择合适的工艺参数,可沉积出表面粗糙度Ra低于10μm、内部组织致密、厚度均匀(壁厚约0.4mm)的薄壁零件。结果表明,激光微沉积合金粉末技术在细小零件的激光表面改性及高精度小型零件的直接制备方面具有很好的应用开发前景。Abstract: For laser powder micro-deposition process,the bonding between the deposited materials and the substrates is crucial to the quality of the deposited components.In order to fabricate fine thin parts with uniform thickness and good bonding strength directly,the effect of processing parameters on wall thickness uniformity and stability of the process during laser micro-deposition of metallic powder from StelliteF alloy is investigated experimentally.The observation and analysis of the cross-section and the microstructure of the deposited thin walls indicate that,the change of heat dissipation condition during deposition influences the wall thickness uniformity.Under reasonable processing parameters,thin wall parts with surface roughness(Ra) as low as 10μm,the wall thickness as thin as 0.4mm and metallurgically sound structure can be deposited directly.It indicates that laser micro-deposition of metallic powder has a bright prospect in laser surface modification of small parts and direct fabrication of fine and precise components.
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Keywords:
- laser technigue /
- laser cladding /
- laser micro-deposition /
- StelliteF alloy /
- thin wall /
- microstructure /
- surface finish
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