火箭推进2017，Vol.43Issue(1)：55-59,5.
K42O2高温合金激光选区熔化成形微观组织研究
Microstructure of selective laser melted nickel-based superalloy K42O2
摘要
Abstract
In order to realize the popularization and application of selective laser melting (SLM) innovative process in the liquid rocket superalloy structure,its strengthen mechanism and corresponding heat treatment regime are revealed.The microstructure formation,evolution laws and phase formation characteristics of SLM under rapid solidification condition are discussed and analyzed in this article.The optical micrograph (OM),scanning electron microscopy (SEM),X-ray diffraction (XRD),and ANSYS thermal simulation combining with classic solidification theory were adopted on a K4202 superalloy sample fabricated by SLM to reveal its microstructure characteristics and evolution laws.It was observed that the as-deposited microstructure was out-of-equilibrium,composed of epitaxial elongated columnar crystal paralleling to the deposition direction,but at the top of the SLM sample the dendrites grew along the laser scanning direction and appeared as secondary dendrite arm,and the precipitated phases were inhibited.关键词
激光选区熔化/K4202高温合金/组织特征/演化规律Key words
selective laser melting/K4202 nickel-based superalloy/microstructure characteristic/evolution law分类
航空航天引用本文复制引用
左蔚,张权明,吴文杰,周化光..K42O2高温合金激光选区熔化成形微观组织研究[J].火箭推进,2017,43(1):55-59,5.基金项目
国防科工局技术基础科研项目(JSJC2013203B016) （JSJC2013203B016）
