Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第18卷    第8期    总第113期    2008年8月

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文章编号:1004-0609(2008)08-1446-07
激光快速成形Rene88DT高温合金的热等静压处理
赵晓明,林 鑫,陈 静,黄卫东

(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1 160 2 h200 MPa热等静压的高压、高温固溶处理后,热影响区裂纹得到明显的愈合修复,在原裂纹附近析出MC型碳化物;将HIP处理后的成形件进一步固溶时效热处理后,拉伸强度和塑性均明显提高,综合力学性能接近粉末冶金Rene88DT的标准。

 

关键词: Rene88DT高温合金;激光快速成形;热等静压;裂纹愈合;拉伸性能

HIP treatment of superalloy Rene88DT prepared by laser rapid forming
ZHAO Xiao-ming, LIN Xin, CHEN Jing, HUANG Wei-dong

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

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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