진공 브레이징을 통해 제조한 TiAl/HI-TEMP 820/SCM440H 재료의공정 온도에 따른 미세조직 및 기계적 특성 평가Evaluation of Microstructure and Mechanical Properties of TiAl/HI-TEMP 820/ SCM440H Materials Manufactured through Vacuum Brazing according to Process Temperature
- Other Titles
- Evaluation of Microstructure and Mechanical Properties of TiAl/HI-TEMP 820/ SCM440H Materials Manufactured through Vacuum Brazing according to Process Temperature
- Authors
- 유상규; 김지원; 이초롱; 오명훈; 최인철
- Issue Date
- Mar-2024
- Publisher
- 대한금속·재료학회
- Keywords
- TiAl; Vacuum brazing; Bonding interface; Mechanical properties; Nanoindentation
- Citation
- 대한금속·재료학회지, v.62, no.3, pp 229 - 238
- Pages
- 10
- Journal Title
- 대한금속·재료학회지
- Volume
- 62
- Number
- 3
- Start Page
- 229
- End Page
- 238
- URI
- https://scholarworks.bwise.kr/kumoh/handle/2020.sw.kumoh/28510
- DOI
- 10.3365/KJMM.2024.62.3.229
- ISSN
- 1738-8228
2288-8241
- Abstract
- The TiAl alloy is attracting attention as a lightweight and heat-resistant material, because of itshigh specific strength, excellent high-temperature formability, and fatigue strength. However, its applicationsare limited by its high unit price and low room temperature ductility. To overcome this issue, dissimilarlybonded materials have been extensively employed. This involves joining a brittle metal to a low-cost metalthat possesses excellent plasticity, using various dissimilar bonding techniques. In this study, TiAl/HI-TEMP820/SCM440H materials were fabricated using a vacuum brazing process under different temperatureconditions. After the brazing process, the microstructure of the interfacial area revealed seven distinct layersresulting from chemical reactions between the base metals and the filler metal. These reaction layersconsisted of a Ni solid solution, intermetallic compounds (Ti3Al, TiNi2Al, Ti2Ni, FeNi), and borides (CrB, TiB2,FeB). To analyze the effect of brazing temperature on the relationship between the microstructure andmechanical properties at the interface of TiAl/HI-TEMP 820/SCM440H materials, conventional uniaxial testsand nanoindentation tests were performed. The measured nanohardness exhibited a significantly largedistribution for each reaction layer, with the highest hardness values observed in the intermetallic compoundsand borides layers. Additionally, room temperature tensile tests confirmed that fractures initiated in the highhardnessand brittle intermetallic compounds and borides layers.
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