Effect of directional solidification process on microstructure and stress rupture property of a hot corrosion resistant single crystal superalloy
The influences of different directional solidification processes, i.e., the high rate solidification (HRS) and liquid metal cooling (LMC), on microstructure and stress rupture property of DD488 alloy were investigated. The DD488 alloy was directional solidified by both HRS and LMC processes. The mic...
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| Format: | Article |
| Language: | English |
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Foundry Journal Agency
2019-01-01
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| Series: | China Foundry |
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| Online Access: | http://ff.foundryworld.com/uploadfile/2019012455957969.pdf |
| _version_ | 1818642020707598336 |
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| author | Liang Luo Cheng-bo Xiao Jing-yang Chen |
| author_facet | Liang Luo Cheng-bo Xiao Jing-yang Chen |
| author_sort | Liang Luo |
| collection | DOAJ |
| description | The influences of different directional solidification processes, i.e., the high rate solidification (HRS) and liquid metal cooling (LMC), on microstructure and stress rupture property of DD488 alloy were investigated. The DD488 alloy was directional solidified by both HRS and LMC processes. The microstructure and stress rupture properties at 980 ºC/250 MPa were investigated by using optical microscopy (OM), scanning electron microscopy (SEM), electron microprobe analyzer (EPMA), transmission electron microscopy (TEM) and stress rupture testing. The results indicated that the LMC process refined the primary dendrite arm and decreased the microporosity volume fraction and solidification segregations of Cr and Co in as-cast DD488 alloy. After standard heat treatment of 1,260 ºC/4 h, AC (air cooling) + 1,080 ºC/4 h, AC + 870 ºC/24 h, AC, the γ′ morphology in LMC alloy was more cuboidal than that in HRS alloy, and the γ′ volume fraction of LMC alloy was higher than that of HRS alloy. The stress rupture life at 980 ºC/250 MPa of HRS alloy was 76.8 h, and it increased to 110.0 h in LMC alloy. The LMC process increased the stress rupture life due to the higher γ′ volume fraction, more perfect rafting structure and finer interfacial dislocation networks. |
| first_indexed | 2024-12-16T23:36:25Z |
| format | Article |
| id | doaj.art-fea3eb651cdd4d8d83a4c739c5f36af4 |
| institution | Directory Open Access Journal |
| issn | 1672-6421 1672-6421 |
| language | English |
| last_indexed | 2024-12-16T23:36:25Z |
| publishDate | 2019-01-01 |
| publisher | Foundry Journal Agency |
| record_format | Article |
| series | China Foundry |
| spelling | doaj.art-fea3eb651cdd4d8d83a4c739c5f36af42022-12-21T22:11:45ZengFoundry Journal AgencyChina Foundry1672-64211672-64212019-01-0116181310.1007/s41230-019-8142-6Effect of directional solidification process on microstructure and stress rupture property of a hot corrosion resistant single crystal superalloyLiang Luo0Cheng-bo Xiao1Jing-yang Chen2Science and Technology on Advanced High Temperature Structural Materials Laboratory, Beijing Institute of Aeronautical Materials, Beijing 100095, ChinaScience and Technology on Advanced High Temperature Structural Materials Laboratory, Beijing Institute of Aeronautical Materials, Beijing 100095, ChinaScience and Technology on Advanced High Temperature Structural Materials Laboratory, Beijing Institute of Aeronautical Materials, Beijing 100095, ChinaThe influences of different directional solidification processes, i.e., the high rate solidification (HRS) and liquid metal cooling (LMC), on microstructure and stress rupture property of DD488 alloy were investigated. The DD488 alloy was directional solidified by both HRS and LMC processes. The microstructure and stress rupture properties at 980 ºC/250 MPa were investigated by using optical microscopy (OM), scanning electron microscopy (SEM), electron microprobe analyzer (EPMA), transmission electron microscopy (TEM) and stress rupture testing. The results indicated that the LMC process refined the primary dendrite arm and decreased the microporosity volume fraction and solidification segregations of Cr and Co in as-cast DD488 alloy. After standard heat treatment of 1,260 ºC/4 h, AC (air cooling) + 1,080 ºC/4 h, AC + 870 ºC/24 h, AC, the γ′ morphology in LMC alloy was more cuboidal than that in HRS alloy, and the γ′ volume fraction of LMC alloy was higher than that of HRS alloy. The stress rupture life at 980 ºC/250 MPa of HRS alloy was 76.8 h, and it increased to 110.0 h in LMC alloy. The LMC process increased the stress rupture life due to the higher γ′ volume fraction, more perfect rafting structure and finer interfacial dislocation networks.http://ff.foundryworld.com/uploadfile/2019012455957969.pdfDD488superalloyliquid metal coolinghigh rate solidificationmicrostructureproperty |
| spellingShingle | Liang Luo Cheng-bo Xiao Jing-yang Chen Effect of directional solidification process on microstructure and stress rupture property of a hot corrosion resistant single crystal superalloy China Foundry DD488 superalloy liquid metal cooling high rate solidification microstructure property |
| title | Effect of directional solidification process on microstructure and stress rupture property of a hot corrosion resistant single crystal superalloy |
| title_full | Effect of directional solidification process on microstructure and stress rupture property of a hot corrosion resistant single crystal superalloy |
| title_fullStr | Effect of directional solidification process on microstructure and stress rupture property of a hot corrosion resistant single crystal superalloy |
| title_full_unstemmed | Effect of directional solidification process on microstructure and stress rupture property of a hot corrosion resistant single crystal superalloy |
| title_short | Effect of directional solidification process on microstructure and stress rupture property of a hot corrosion resistant single crystal superalloy |
| title_sort | effect of directional solidification process on microstructure and stress rupture property of a hot corrosion resistant single crystal superalloy |
| topic | DD488 superalloy liquid metal cooling high rate solidification microstructure property |
| url | http://ff.foundryworld.com/uploadfile/2019012455957969.pdf |
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