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28卷    第6期    总第231期    2018年6月

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文章编号:1004-0609(2018)-06-1136-07
预热下激光沉积修复GH4169合金表面损伤的残余应力和拉伸性能
卞宏友1,董文启1,曲 伸2,杨 光1,钦兰云1,王 维1

(1. 沈阳航空航天大学 航空制造工艺数字化国防重点学科实验室,沈阳 110136; 2. 中国航发沈阳黎明航空发动机有限责任公司,沈阳 110043)

摘 要: 结合GH4169高温合金表面损伤的修复需求,研究基体预热对不同基体厚度的激光沉积修复GH4169高温合金试样残余应力、显微组织、拉伸性能的影响规律。结果表明:与未预热修复试样相比,基体预热300 ℃的GH4169合金激光沉积修复试样的残余应力σx、σy均明显降低,修复区枝晶间析出的Laves相变得粗壮并呈现颗粒状的碎化趋势,抗拉强度略微降低,但断后伸长率提高60%以上,达到锻件标准。基体厚度越大,修复体厚度越小,修复试样的残余应力减小,枝晶间析出的Laves相减少,抗拉强度与断后伸长率均略有增加。

 

关键字: GH4169合金;激光沉积修复;预热;残余应力;显微组织;拉伸性能

Residual stress and tensile property of laser deposition repair GH4169 alloy surface damage with preheating
BIAN Hong-you1, DONG Wen-qi1, QU Shen2, YANG Guang1, QIN Lan-yun1, WANG Wei1

1. Key Laboratory of Fundamental Science for National Defence of Aeronautical Digital Manufacturing Process, Shenyang Aerospace University, Shenyang 110136, China; 2. Welding Laboratory, Shenyang Liming Aero-Engine (Group) Corporation LTD, Shenyang 110043, China

Abstract:Combining with the repairing demand of GH4169 alloy surface damage, the effect of substrate preheating process on the residual stress, microstructure and tensile property of laser deposition repair (LDR) GH4169 alloy specimen with different substrate thickness were investigated. The results show that, in contrast to repaired specimen without preheating, laser deposition repair GH4169 alloy after the substrate is preheated to 300 ℃, both σx and σy of residual stress are reduced obviously. The Laves phase of the interdendritic in deposition becomes thick, and it presents a granular fragmentation phenomenon. The tensile strength is reduced slightly, but the elongation rate increases above 60%.These indicate that the standard of forging is reached. With the bigger substrate thickness and the smaller deposition thickness, the residual stress and Laves phase of the interdendritic of repaired specimen are decreased, the tensile strength and elongation are improved slightly.

 

Key words: GH4169 alloy; laser deposition repair; preheat; residual stress; microstructure; tensile property

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

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

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