316L不锈钢粉末激光熔覆薄壁件成形工艺研究
Research on Forming Process of Laser Cladding Thin-Wall Part of 316L Stainless Steel Powder
王玉梅 1侯哲哲 1孙艺泽 1齐海波1
作者信息
- 1. 石家庄铁道大学 材料科学与工程学院,河北 石家庄 050043
- 折叠
摘要
在316L不锈钢薄壁墙和方形薄壁试件的激光熔覆过程中,薄壁墙出现塌陷、表面不平整的缺陷,方形薄壁试件出现翘曲、过堆和裂纹等问题,对其成形过程进行了分析,提出措施解决了成形问题.并分析了方形薄壁件的硬度分布.结果表明:熔覆头急停急走,送粉量不均匀,造成熔覆成形缺陷.通过实时观察成形形貌,采用均匀送粉,得到规则形状的薄壁墙.对于方形薄壁件,不仅采用均匀送粉量,还采用"路径随机"方法,即以四层为一个周期,其中每周期第一、二、三、四层的起点依次为正方形的四个随机点进行熔覆,成形件层间均匀、表面平整,成形质量得到有效改善.
Abstract
During the cladding process of 316 L stainless steel with single thin-walled and thin-walled specimen,the cladding head was stopped abruptly,and the powder delivery was uneven,which led to warping,deformation and cracks in the cladding layer.Uniform powder feeding and"random path"method were adopted,which enlarged the heat dissipation area,reduced the temperature gradient,avoided the accumulation of a large amount of heat in the specimen,and effectively improved the forming quality of the specimen.Thus,the dendrite,columnar crystal and cellular crystal structures distributed in sequence from the top to the base layer were obtained,and the hardness of the cladding parts showed a decreasing trend accordingly.
关键词
激光熔覆/薄壁件/扫描路径Key words
laser cladding/thin-wall part/scanning path引用本文复制引用
出版年
2024
NETL
NSTL
万方数据