(西北工業(yè)大學 凝固技術國家重點實驗室，西安 710072)
摘 要:
采用金相分析、掃描電鏡分析、拉伸實驗等方法研究熱等靜壓(HIP)處理對激光快速成形Rene88DT粉末盤用高溫合金裂紋和力學性能的影響。結果表明：成形件經(jīng)1
關鍵字: Rene88DT高溫合金；激光快速成形；熱等靜壓；裂紋愈合；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
