Microstructure and properties of DD6 single crystal superalloy repaired joint using laser melting deposition
Laser melting deposition is more suitable for repairing thin-walled substrates of single crystal alloys compared to argon arc welding and micro plasma arc welding. This article used laser melting deposition technology for additive repair of DD6 single crystal superalloy. The microstructure character...
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| Format: | Article |
| Language: | zho |
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Journal of Materials Engineering
2024-12-01
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| Series: | Cailiao gongcheng |
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| Online Access: | https://jme.biam.ac.cn/CN/10.11868/j.issn.1001-4381.2024.000606 |
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| author | QU Zhiqi QIN Renyao ZHANG Xuejun CHEN Bingqing HUANG Shuai ZHANG Guohui |
| author_facet | QU Zhiqi QIN Renyao ZHANG Xuejun CHEN Bingqing HUANG Shuai ZHANG Guohui |
| author_sort | QU Zhiqi |
| collection | DOAJ |
| description | Laser melting deposition is more suitable for repairing thin-walled substrates of single crystal alloys compared to argon arc welding and micro plasma arc welding. This article used laser melting deposition technology for additive repair of DD6 single crystal superalloy. The microstructure characteristics of the repaired zone and heat affected zone of the additive repaired joint were analysed by optical microscopy， scanning electron microscopy， and EBSD. And the microhardness distribution and high-temperature tensile properties of the repaired joint were tested. The results indicate that in the heat affected zone adjacent to the repair interface， γ' phase is partially coarsened and dissolved， and the hardness decreases significantly. The microstructure of repaired zone is an oriented columnar crystal structure grown epitaxially， and composed of γ+γ' phase and a small amount of dispersed carbides between dendrites. Many elongated columnar stray grains remain in the repaired zone， mostly distribute near the fusion line. As the height of the repaired zone increases， the dendrite spacing and hardness of the epitaxial growth tissue increases gradually， and the proportion of fine grid γ' phase in the dendrites increases continuously. The tensile strength of the repaired joint at 980 ℃ reaches 102% of the base material， and the yield strength reaches 92% of the base material， but the elongation is relatively poor. |
| format | Article |
| id | doaj-art-5a99cf701a644f269d0dbb09216fbe34 |
| institution | OA Journals |
| issn | 1001-4381 |
| language | zho |
| publishDate | 2024-12-01 |
| publisher | Journal of Materials Engineering |
| record_format | Article |
| series | Cailiao gongcheng |
| spelling | doaj-art-5a99cf701a644f269d0dbb09216fbe342025-08-20T02:34:47ZzhoJournal of Materials EngineeringCailiao gongcheng1001-43812024-12-015212293610.11868/j.issn.1001-4381.2024.0006061001-4381（2024）12-0029-08Microstructure and properties of DD6 single crystal superalloy repaired joint using laser melting depositionQU ZhiqiQIN RenyaoZHANG XuejunCHEN BingqingHUANG ShuaiZHANG GuohuiLaser melting deposition is more suitable for repairing thin-walled substrates of single crystal alloys compared to argon arc welding and micro plasma arc welding. This article used laser melting deposition technology for additive repair of DD6 single crystal superalloy. The microstructure characteristics of the repaired zone and heat affected zone of the additive repaired joint were analysed by optical microscopy， scanning electron microscopy， and EBSD. And the microhardness distribution and high-temperature tensile properties of the repaired joint were tested. The results indicate that in the heat affected zone adjacent to the repair interface， γ' phase is partially coarsened and dissolved， and the hardness decreases significantly. The microstructure of repaired zone is an oriented columnar crystal structure grown epitaxially， and composed of γ+γ' phase and a small amount of dispersed carbides between dendrites. Many elongated columnar stray grains remain in the repaired zone， mostly distribute near the fusion line. As the height of the repaired zone increases， the dendrite spacing and hardness of the epitaxial growth tissue increases gradually， and the proportion of fine grid γ' phase in the dendrites increases continuously. The tensile strength of the repaired joint at 980 ℃ reaches 102% of the base material， and the yield strength reaches 92% of the base material， but the elongation is relatively poor.https://jme.biam.ac.cn/CN/10.11868/j.issn.1001-4381.2024.000606dd6 single crystal superalloylaser melting depositionadditive repaired jointmicrostructure and mechanical property |
| spellingShingle | QU Zhiqi QIN Renyao ZHANG Xuejun CHEN Bingqing HUANG Shuai ZHANG Guohui Microstructure and properties of DD6 single crystal superalloy repaired joint using laser melting deposition Cailiao gongcheng dd6 single crystal superalloy laser melting deposition additive repaired joint microstructure and mechanical property |
| title | Microstructure and properties of DD6 single crystal superalloy repaired joint using laser melting deposition |
| title_full | Microstructure and properties of DD6 single crystal superalloy repaired joint using laser melting deposition |
| title_fullStr | Microstructure and properties of DD6 single crystal superalloy repaired joint using laser melting deposition |
| title_full_unstemmed | Microstructure and properties of DD6 single crystal superalloy repaired joint using laser melting deposition |
| title_short | Microstructure and properties of DD6 single crystal superalloy repaired joint using laser melting deposition |
| title_sort | microstructure and properties of dd6 single crystal superalloy repaired joint using laser melting deposition |
| topic | dd6 single crystal superalloy laser melting deposition additive repaired joint microstructure and mechanical property |
| url | https://jme.biam.ac.cn/CN/10.11868/j.issn.1001-4381.2024.000606 |
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