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选区激光熔化成型18Ni300钢显微组织与性能研究
Study on Microstructure and Properties of 18Ni300 Steel Fabricated by Selective Laser Melting
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- DOI:
- 作者:
- 陈帅 陶凤和 贾长治
CHEN Shuai;TAO Fenghe;JIA Changzhi
- 作者单位:
- 陆军工程大学石家庄校区
Shijiazhuang Branch, Army Engineering University, Shijiazhuang 050003, China
- 关键词:
- 选区激光熔化 18Ni300钢 显微组织 性能
selective laser melting 18Ni300 steel microstructure property
- 摘要:
- 采用选区激光熔化技术制备了18Ni300钢试样,分析了激光线能量密度对相对致密度和显微硬度的影响规律,研究了显微组织与性能的内在联系。结果表明,试样熔池中心区域为均匀的胞状组织,过渡区为细小的胞状组织,热影响区为粗大的胞状或扁状组织。同一激光线能量密度下,过渡区显微硬度高于熔池中心区域显微硬度。随激光线能量密度的降低,试样孔隙缺陷增加、显微组织不均匀,导致其相对致密度和显微硬度降低;当激光线能量密度过大时,显微组织粗大,其相对致密度和显微硬度降低;当η=543 J·m^-1时,显微组织均匀,相对致密度最高,达到99.76%,显微硬度值最高,熔池中心区域和过渡区分别为351 HV和355 HV。The 18 Ni300 steel samples were fabricated by selective laser melting(SLM) technique. The influence of laser energy density on relative density and microhardness was analyzed, and the internal relationship between microstructure and properties was investigated. The results show that the central area of molten pool is a uniform cell structure, the transition zone is a small cell structure, and the heat affected zone is a coarse cell structure or a flat structure. The microhardness of the transition zone is higher than that of the central zone under the same laser energy density. With the decrease of the laser line energy density, the pore defects of the sample increase and the microstructure is not uniform,resulting in the decrease of its relative density and microhardness. When the laser line energy density is too large, the microstructure is too coarse, and the relative density and microhardness will decrease. When the laser line energy density η is 543 J·m^-1, the microstructure is uniform and the relative density is the highest, reaching 99.76%, and the microhardness is the highest. The central area and transition area of the molten pool are 351 HV and 355 HV, respectively.