Effect of Post Weld Heat Treatment on Microstructure and Creep Property of the TLP Bonded Ni-Based Superalloy

IF 4 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Metals and Materials International Pub Date : 2025-01-16 DOI:10.1007/s12540-024-01877-5

Jie Chen, Minghao Hu, Chong Li, Huijun Li, Xingchuan Xia

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Abstract

Transient liquid phase (TLP) bonding technology was effectively used to join a Ni-based superalloy using a BNi-2 amorphous interlayer. The TLP joint consisted of isothermal solidification zone (ISZ) with γ + γ′ phase and diffusion affected zone (DAZ) with granular borides. A post weld heat treatment (PWHT) process was subsequently employed to homogenize the joint microstructure and reduce the compositional fluctuation. Creep tests conducted under 800 ℃ and 120 MPa revealed that both the TLP and TLP + PWHT samples exhibited similar γ′ phase shearing deformation modes and intergranular fracture characteristics. Through PWHT process, the small ISZ grains were eliminated and the oxidation resistance of the joint was enhanced, reducing the cracking tendency of the joint grain boundaries. Therefore, the creep life of the TLP bonded sample is significantly prolonged from 367 h to 1034 h after PWHT process.

Graphical Abstract

Abstract Image

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焊后热处理对TLP结合镍基高温合金组织和蠕变性能的影响

采用瞬态液相（TLP）键合技术，利用BNi-2非晶间层有效地连接了镍基高温合金。TLP接头由含γ + γ′相的等温凝固区（ISZ）和含颗粒状硼化物的扩散影响区（DAZ）组成。随后采用焊后热处理（PWHT）工艺使接头组织均匀化，减少成分波动。在800℃和120 MPa下进行的蠕变试验表明，TLP和TLP + PWHT试样均表现出相似的γ′相剪切变形模式和晶间断裂特征。通过PWHT工艺，消除了细小的ISZ晶粒，提高了接头的抗氧化性，降低了接头晶界的开裂倾向。因此，经PWHT处理后，TLP粘结试样的蠕变寿命从367 h显著延长至1034 h。图形抽象

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来源期刊

Metals and Materials International 工程技术-材料科学：综合

CiteScore

7.10

自引率

8.60%

发文量

197

审稿时长

3.7 months

期刊介绍： Metals and Materials International publishes original papers and occasional critical reviews on all aspects of research and technology in materials engineering: physical metallurgy, materials science, and processing of metals and other materials. Emphasis is placed on those aspects of the science of materials that are concerned with the relationships among the processing, structure and properties (mechanical, chemical, electrical, electrochemical, magnetic and optical) of materials. Aspects of processing include the melting, casting, and fabrication with the thermodynamics, kinetics and modeling.