Method for eliminating laser deposition holes of alloy structural steel

• Main Authors: PENG XIAO, XIE YUJIANG, DONG ZHIHONG, KANG HONGWEI, CHI CHANGTAI
• Format: Patent
• Language: Chinese; English
• Published: 01.03.2019
• Subjects: CASTING; CHEMICAL SURFACE TREATMENT; CHEMISTRY; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATIONOR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY IONIMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; COATING MATERIAL WITH METALLIC MATERIAL; COATING METALLIC MATERIAL; DIFFUSION TREATMENT OF METALLIC MATERIAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL; MAKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; METALLURGY; PERFORMING OPERATIONS; POWDER METALLURGY; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THESURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; TRANSPORTING; WORKING METALLIC POWDER

The invention belongs to the field of metal laser additive manufacturing, relates to a method for eliminating laser deposition holes of low-carbon alloy structural steel and is suitable for the elimination of laser deposition hole defects of alloy steel components with various complex structures. The method comprises the following steps: adopting one or more of Ni powder, Cr powder and Nb powder with the same particle size as alloy steel powder, uniformly mixing a certain proportion in the alloy steel powder through a ball mill, performing laser deposition in a vacuum glove box by using a synchronous powder feeding method and protecting a laser deposition area by using argon with a certain flow rate in the deposition process. Therefore, the laser additive manufacturing of the structural steel without holes in an internal structure can be realized. The invention provides the novel process method for the elimination of the laser deposition holes of the structural steel powder, so that when a change in the chemi