Effect of Ti Content on the Microstructure and High-Temperature Creep Property of Cast Fe-Ni-Based Alloys with High-Al Content
| Autor: | Chaewon Jeong, Changheui Jang, Ji Ho Shin, Gokul Obulan Subramanian |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Materials science
heat resistant alloys Annealing (metallurgy) Al content Alloy 02 engineering and technology engineering.material 01 natural sciences lcsh:Technology Article creep γ’-Ni3(Al Ti) precipitates 0103 physical sciences alumina-forming alloys General Materials Science lcsh:Microscopy lcsh:QC120-168.85 010302 applied physics Austenite lcsh:QH201-278.5 lcsh:T Metallurgy Fracture mechanics 021001 nanoscience & nanotechnology Microstructure Creep lcsh:TA1-2040 B2-NiAl phase engineering Void nucleation lcsh:Descriptive and experimental mechanics lcsh:Electrical engineering. Electronics. Nuclear engineering 0210 nano-technology lcsh:Engineering (General). Civil engineering (General) lcsh:TK1-9971 |
| Zdroj: | Materials Materials, Vol 14, Iss 82, p 82 (2021) Volume 14 Issue 1 |
| ISSN: | 1996-1944 |
| Popis: | The cast Fe-Ni-based austenitic heat-resistant alloys with 4.5 wt% Al and varying Ti content were developed for high-temperature application. With increase in Ti content, strength of model alloys increased gradually at 700 ° C and 750 ° C. At 750 ° C, alloys with 35Ni&ndash (2~4)Ti composition showed a significant increase in creep rupture life compared to 30Ni&ndash 1Ti alloy, attributed to the increase in &gamma &rsquo Ni3(Al,Ti) precipitates due to higher Ni and Ti content. Among the 35Ni&ndash (2~4)Ti alloys, increasing Ti content from 2 to 4 wt% gradually increased the creep rupture life in the as-cast condition. The creep rupture life was improved after solution annealing treatment, however, the beneficial effect of higher Ti content was not evident for 35Ni&ndash (2~4)Ti alloys. After solution annealing, interdendritic phases were partially dissolved, but coarse B2-NiAl phases were formed. The size and amount of coarse B2-NiAl phases increased with Ti content. In the creep-tested specimens, creep void nucleation and crack propagation were observed along the coarse B2-NiAl phases, especially for high-Ti alloys. Therefore, the beneficial effect of the increase in &gamma Ni3(Al,Ti) precipitates for high-Ti alloys on creep property was limited due to the detrimental effect of the presence of coarse B2-NiAl phases. |
| Databáze: | OpenAIRE |
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