Effect of pouring temperature on microstructure and durability of DD419 single crystal superalloy
The creep rupture properties of DD419 single crystal superalloys，fabricated at varying pouring temperatures were examined under conditions of 850 ℃/650 MPa，1050 ℃/190 MPa and 1100 ℃/130 MPa. SEM，EDS and TEM were used to analyze the microstructure and component segregation to study their effects on t...
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Journal of Aeronautical Materials
2025-02-01
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| Series: | Journal of Aeronautical Materials |
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| Online Access: | http://jam.biam.ac.cn/article/doi/10.11868/j.issn.1005-5053.2023.000014 |
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| author | ZHANG Hui DING Qiang LIU Jide |
| author_facet | ZHANG Hui DING Qiang LIU Jide |
| author_sort | ZHANG Hui |
| collection | DOAJ |
| description | The creep rupture properties of DD419 single crystal superalloys，fabricated at varying pouring temperatures were examined under conditions of 850 ℃/650 MPa，1050 ℃/190 MPa and 1100 ℃/130 MPa. SEM，EDS and TEM were used to analyze the microstructure and component segregation to study their effects on the durability. The results show that as the pouring temperature decreases，the primary dendrite spacing of the alloy widens，the eutectic content and the number of micropore increase，and the γ′ phase size diminishes. Under high temperature/low stress（1100℃/130 MPa），the γ′ phase size exerts a more pronounced influence on durability than do micropore and residual eutectic content. The finely dispersed γ′ phase enhances the alloy’s durability under all three test scenarios，with the alloy poured at 1500 ℃ exhibiting optimal durability. At intermediate temperature/high stress condition（1050℃/190 MPa），the γ′ phase is intersected by numerous dislocations, and dispersed γ′ phase may contribute to dislocation pile-ups. Concurrently，the alloy maintains good elongation at different pouring temperatures；however，as the pouring temperature decreases，section shrinkage decreases under all three test conditions. Pouring temperature has a negligible impact on the the alloy’s fracture morphology. Specifically, the γ′ phase near the fracture surface of the specimen tested under 850 ℃/650 MPa condition remains cubic morphology，with a mixed -mode fracture mechanism. Under other durability parameters，the γ′ phase assumes a rafted configuration，leading to an all-micropore aggregation fracture mechanism. |
| format | Article |
| id | doaj-art-00c8c4ade0f84b54ac77997edd082a9a |
| institution | Kabale University |
| issn | 1005-5053 |
| language | zho |
| publishDate | 2025-02-01 |
| publisher | Journal of Aeronautical Materials |
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| series | Journal of Aeronautical Materials |
| spelling | doaj-art-00c8c4ade0f84b54ac77997edd082a9a2025-02-12T09:22:41ZzhoJournal of Aeronautical MaterialsJournal of Aeronautical Materials1005-50532025-02-01451707910.11868/j.issn.1005-5053.2023.000014a2023-0014Effect of pouring temperature on microstructure and durability of DD419 single crystal superalloyZHANG Hui0DING Qiang1LIU Jide2Key Laboratory of Electromagnetic Processing of Materials（Ministry of Education），Northeastern University，Shenyang 110819，ChinaKey Laboratory of Electromagnetic Processing of Materials（Ministry of Education），Northeastern University，Shenyang 110819，ChinaDepartment of Superalloys，Institute of Metal Research，Chinese Academy of Sciences，Shenyang 110016，ChinaThe creep rupture properties of DD419 single crystal superalloys，fabricated at varying pouring temperatures were examined under conditions of 850 ℃/650 MPa，1050 ℃/190 MPa and 1100 ℃/130 MPa. SEM，EDS and TEM were used to analyze the microstructure and component segregation to study their effects on the durability. The results show that as the pouring temperature decreases，the primary dendrite spacing of the alloy widens，the eutectic content and the number of micropore increase，and the γ′ phase size diminishes. Under high temperature/low stress（1100℃/130 MPa），the γ′ phase size exerts a more pronounced influence on durability than do micropore and residual eutectic content. The finely dispersed γ′ phase enhances the alloy’s durability under all three test scenarios，with the alloy poured at 1500 ℃ exhibiting optimal durability. At intermediate temperature/high stress condition（1050℃/190 MPa），the γ′ phase is intersected by numerous dislocations, and dispersed γ′ phase may contribute to dislocation pile-ups. Concurrently，the alloy maintains good elongation at different pouring temperatures；however，as the pouring temperature decreases，section shrinkage decreases under all three test conditions. Pouring temperature has a negligible impact on the the alloy’s fracture morphology. Specifically, the γ′ phase near the fracture surface of the specimen tested under 850 ℃/650 MPa condition remains cubic morphology，with a mixed -mode fracture mechanism. Under other durability parameters，the γ′ phase assumes a rafted configuration，leading to an all-micropore aggregation fracture mechanism.http://jam.biam.ac.cn/article/doi/10.11868/j.issn.1005-5053.2023.000014dd419pouring temperaturecreep rupture propertymicroporefracture mechanism |
| spellingShingle | ZHANG Hui DING Qiang LIU Jide Effect of pouring temperature on microstructure and durability of DD419 single crystal superalloy Journal of Aeronautical Materials dd419 pouring temperature creep rupture property micropore fracture mechanism |
| title | Effect of pouring temperature on microstructure and durability of DD419 single crystal superalloy |
| title_full | Effect of pouring temperature on microstructure and durability of DD419 single crystal superalloy |
| title_fullStr | Effect of pouring temperature on microstructure and durability of DD419 single crystal superalloy |
| title_full_unstemmed | Effect of pouring temperature on microstructure and durability of DD419 single crystal superalloy |
| title_short | Effect of pouring temperature on microstructure and durability of DD419 single crystal superalloy |
| title_sort | effect of pouring temperature on microstructure and durability of dd419 single crystal superalloy |
| topic | dd419 pouring temperature creep rupture property micropore fracture mechanism |
| url | http://jam.biam.ac.cn/article/doi/10.11868/j.issn.1005-5053.2023.000014 |
| work_keys_str_mv | AT zhanghui effectofpouringtemperatureonmicrostructureanddurabilityofdd419singlecrystalsuperalloy AT dingqiang effectofpouringtemperatureonmicrostructureanddurabilityofdd419singlecrystalsuperalloy AT liujide effectofpouringtemperatureonmicrostructureanddurabilityofdd419singlecrystalsuperalloy |