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GH4099 和 GH3128 异质高温合金 TLP 扩散 焊接头组织与性能演化
Microstructuraland Mechanical Property Evolution of GH4099 and GH3128 Dissimilar Superalloy Joints by TLP Diffusion Bonding
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- DOI:
- 作者:
- 刘晓芸 1，2，郝 定 1，2，巴 特 3，熊江涛 1，2，李京龙 1，2
LIU Xiaoyun1,2, HAO Ding1,2, BA Te3, XIONG Jiangtao1,2, LI Jinglong1,2
- 作者单位:
- 1. 西北工业大学 凝固技术全国重点实验室，陕西 西安 710072；2. 西北工业大学 摩擦焊接技术陕西省重点实验室，陕 西西安 710072；3. 中国机械总院集团哈尔滨焊接研究所有限公司，黑龙江 哈尔滨 150028
1. State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xian 710072, China; 2. Shaanxi Key Laboratory of Friction Welding Technologies, Northwestern Polytechnical University, Xi'an 710072, China; 3. Harbin Welding Institute Co., Ltd., China Machinery Industry Group, Harbin 150028, China
- 关键词:
- 高温合金；BNi-2；TLP；界面组织演变；力学性能
superalloys; BNi-2; TLP; interface microstructure evolution; mechanical properties
- 摘要:
- 针对航空、航天等领域对异质镍基高温合金高可靠性连接的迫切需求，开展了异质镍基高温合金 GH4099和 GH3128 的瞬时液相扩散焊(transient liquid phase diffusion welding, TLP)研究，系统研究了焊接温度对接头显微组织与力学性能的影响规律，为异质材料的焊接提供理论指导。 采用 BNi-2 为中间层，通过 EBSD、EPMA、SEM 等手段对接头微观结构 进 行 表 征 ，并结 合 拉 伸 性 能 测 试 分 析 其 力 学 行 为 。 结果 表 明 ，随焊 接 温 度 升 高 ，等温 凝 固 区(ISZ)晶 粒逐渐长 大，扩散影响区(DAZ)晶界硼化物由连续状向断续状转变；焊接温度 1 120 ℃时接头力学性能最优，抗拉强度达到953 MPa，为 GH3128 母材的 117.1%。Inresponse to the urgent demand for highly reliable joining of heterogeneous nickel-based superalloys in aerospace applications, transient liquid phase diffusion welding (TLP) of dissimilar nickel-based superalloys GH4099 and GH3128 was studied. The influence of the bonding temperature on the microstructure and mechanical properties of the joints was systematically investigated, providing theoretical guidance for welding dissimilar materials. BNi-2 was used as an interlayer, and the joint microstructures were characterized via EBSD, EPMA, and SEM. Tensile tests were performed to evaluate the mechanical properties. The results indicate that with increasing bonding temperature, grain growth gradually occurs in the isothermal solidification zone (ISZ) and that the borides along the grain boundaries in the diffusion-affected zone (DAZ) change from a continuous to a discontinuous morphology. The joint bonded at 1 120 ℃ exhibits the best mechanical performance, with an ultimate tensile strength of 953 MPa, equivalent to 117.1% of the GH3128 base metal.