Effect of Orientation Deviation on Microstructure and Mechanical Properties of Nickel-Based Single Crystal Superalloy Brazing Joints

doi:10.11900/0412.1961.2019.00258

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	Effect of Orientation Deviation on Microstructure and Mechanical Properties of Nickel-Based Single Crystal Superalloy Brazing Joints
	Zhao, Xu 1,2; Sun, Yuan 1; Hou, Xingyu 1; Zhang, Hongyu 1; Zhou, Yizhou 1,2; Ding, Yutian 2
刊名	Jinshu Xuebao/Acta Metallurgica Sinica
	2020-02-11
卷号	56 期号:2 页码:171-181
关键词	Aircraft engines Brazing Eutectics Fillers Grain boundaries High temperature effects Microstructure Nickel alloys Nickel compounds Phase composition Silicon compounds Single crystals Superalloys Tensile strength Tensile testing Turbomachine blades Diffusion-affected zone Filler alloy Melting point depressant Microstructure and mechanical properties Ni-based single crystal superalloy Room and high temperatures Single crystal components Single crystal superalloys
ISSN号	04121961
DOI	10.11900/0412.1961.2019.00258
英文摘要	Ni-based single crystal superalloy has excellent high temperature properties, which is the main materials for aero-engine turbine blade. In order to improve the yield strength of single crystal blades, the reliable bonding technology has become an increasingly indispensable key technology in the process of producing single crystal blades. However, there is inevitably an orientation deviation in the bonded single crystal component, owing to its shape complexity and randomness during assembly in the practice of bonding single crystal components. The CMSX-4 single crystal superalloy with the orientation combination of 0°+0°, 0°+45° and 0°+90° were brazed by Ni-based filler alloy at 1210 for 30 min and carried out ageing heat treatment. The effect of base material orientation combination on the microstructure was analyzed by SEM, EBSD and EPMA. The mechanical properties of joints after bonding and ageing treatment were tested. The result indicates that the microstructures and phase compositions of three orientation combination joints were similar in the filler alloy zone, consisting of γ-Ni, γ’, γ+γ’ eutectic, M 3B2 type boride, CrB, nickel-silicon compound and γ-Ni+Ni3B+CrB ternary eutectic phase. The melting point depressant B in the filler alloy is not diffused significantly to the base material, and no brittle compound phase is precipitated in the diffusion affected zone of the joint. After ageing treatment, elements diffusion is uniform and brittle precipitates are reduced, and the continuous grain boundary can be observed at the center of the joint when the base material on both sides of the joint has orientation deviation. The testing results of mechanical properties show that the base material orientation deviation has no distinctly effect on the room and high temperature tensile properties of the joint. However, the tensile strengths of the joint at room and high temperature both reduce with orientation deviation after ageing treatment, but the degree of orientation deviation has no obvious influence on the tensile strength of the joint. The fracture of the three joints occurs in the filler alloy zone. © All right reserved.
语种	中文
出版者	Chinese Academy of Sciences
内容类型	期刊论文
源URL	[http://ir.lut.edu.cn/handle/2XXMBERH/115271]
专题	省部共建有色金属先进加工与再利用国家重点实验室
作者单位	1.Institute of Metal Research, Chinese Academy of Sciences, Shenyang; 110016, China 2.State Key Laboratory of Advanced and Recycling of Nonferrous Metals, Lanzhou University of Technology, Lanzhou; 730050, China;
推荐引用方式 GB/T 7714	Zhao, Xu,Sun, Yuan,Hou, Xingyu,et al. Effect of Orientation Deviation on Microstructure and Mechanical Properties of Nickel-Based Single Crystal Superalloy Brazing Joints[J]. Jinshu Xuebao/Acta Metallurgica Sinica,2020,56(2):171-181.
APA	Zhao, Xu,Sun, Yuan,Hou, Xingyu,Zhang, Hongyu,Zhou, Yizhou,&Ding, Yutian.(2020).Effect of Orientation Deviation on Microstructure and Mechanical Properties of Nickel-Based Single Crystal Superalloy Brazing Joints.Jinshu Xuebao/Acta Metallurgica Sinica,56(2),171-181.
MLA	Zhao, Xu,et al."Effect of Orientation Deviation on Microstructure and Mechanical Properties of Nickel-Based Single Crystal Superalloy Brazing Joints".Jinshu Xuebao/Acta Metallurgica Sinica 56.2(2020):171-181.