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30卷    第3期    总第252期    2020年3月

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文章编号:1004-0609(2020)-03-0542-08
激光沉积修复GH536/GH738合金的组织及力学性能
卞宏友1,朱明昊1,李 英2,杨 光1,王 维1,王 伟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 焊接技术室,沈阳 110043
)

摘 要: 采用GH536合金粉末对GH738合金损伤试样进行激光沉积修复试验研究,通过正交试验法优化工艺参数,得到较小熔深、无缺陷的修复试样;测试分析了修复试样的显微组织、室温拉伸性能及显微硬度。结果表明:合金修复区为外延生长的柱状晶组织,修复区边缘柱状晶取向较一致,修复区中心柱状晶出现一定角度转向;合金修复区枝晶干上主要为富含Mo、Cr的M6C碳化物,晶界处出现少量细小的M23C6碳化物。相比于基体,合金热影响区中γ′相数量减少并呈粗化趋势,MC碳化物发生分解。激光沉积修复试样室温抗拉强度为GH738锻件的66.5%,高于 GH536锻件强度;断后伸长率分别低于GH738锻件及GH536锻件的;修复区域的显微硬度分别低于GH738基体的显微硬度,高于GH536锻件的显微硬度。

 

关键字: GH536合金;GH738合金;激光沉积修复;显微组织;拉伸性能;显微硬度

Microstructure and mechanical properties of laser deposition repair of GH536/GH738 superalloy
BIAN Hong-you1, ZHU Ming-hao1, LI Ying2, YANG Guang1, WANG Wei1, WANG Wei1

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

Abstract:The GH536 alloy power was used for the laser deposition repair of the GH738 damage specimen, and the flawless specimen with a small weld depth was obtained through orthogonal test. The microstructure, room temperature tensile properties and microhardness of the repair specimens were analyzed. The results show that the microstructure of repair zone is columnar dendrite with an epitaxial growth. The columnar dendrite at the edge of repair zone shows an uniform orientation, and that at the center of repair zone appears a certain angle of rotation .In the repair zone, the M6C carbides rich in Mo, Cr are mostly at dendrite stem, and a small amount of fine M23C6 carbides are found at grain boundary. Compared with the substrate, the amount of γ′ phase in heat-affected zone decreases obviously, the size of γ'phase shows a coarsening tendency, and the MC carbides decompose. The tensile strength at room temperature of the laser deposition repair specimens is approximately 66.5% of the GH738 forgings, and it is higher than that of GH536 forgings. The elongation of the laser deposition repair specimens is lower than that of GH738 forgings and GH536 forgings, respectively. The microhardness of repair zone is lower than that of GH738 substrate, and slightly higher than that of GH536 forgings.

 

Key words: GH536 alloy; GH738 alloy; laser deposition repair; microstructure; tensile property; microhardness

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

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

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