(西北工业大学 凝固技术国家重点实验室，西安 710072)
摘 要:
采用金相分析、扫描电镜分析、拉伸实验等方法研究热等静压(HIP)处理对激光快速成形Rene88DT粉末盘用高温合金裂纹和力学性能的影响。结果表明：成形件经1
关键字: Rene88DT高温合金；激光快速成形；热等静压；裂纹愈合；拉伸性能
（State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an 710072, China）
Abstract:The effects of hot isostatic pressing (HIP) on the cracks and tensile properties of laser rapid forming (LRF) superalloy Rene88DT were investigated by metallography, scanning election microscopy and tensile test. Due to the heat affected zone crack in the LRF Rene88DT superalloy, the mechanical properties are severely degraded. HIP treatment (1 160 ℃, 2 h, 200 MPa) is used to try to eliminate such defects. The results show that after HIP treatment, the cracks in the heat affected zone are obviously healed, while MC carbides precipitate along the healed crack area. Through further solution/aging treatment after LRF+HIP, the tensile properties of the Rene88DT samples can be improved considerably, and nearly reach that of the P/M Rene88DT standard.
Key words: superalloy Rene88DT; laser rapid forming; hot isostatic pressing(HIP); crack healing; tensile properties
