A fine {gamma}{prime} + {alpha} cellular structure in Fe-37.3 wt pct Ni-3.6 wt pct Al-3.3 wt pct Ti-0.2 wt pct C and its influence on high-temperature tensile properties
- Hankook Tire Co., Ltd., Taejon (Korea, Republic of)
- Korea Advanced Inst. of Science and Technology, Taejon (Korea, Republic of). Dept. of Materials Science and Engineering
Fe-37.3 wt pct Ni-3.6 wt pct Al-3.3 wt pct Ti-0.2 wt pct C alloy, which reveals an excellent combination of high strength and good elongation endowed by formation of homogeneously dispersed fine {gamma}{prime} precipitates in the matrix during aging at 823 K, has been investigated by means of transmission electron and optical microscopies, electron diffractions, and tensile tests. The influence of unique {gamma} + {alpha} cellular products on the mechanical properties has also been studied. Because of low elastic mismatch between the austenitic {gamma} matrix and isomorphic {gamma}{prime} precipitate phases, the homogeneously distributed precipitate particles, which formed at the early stage of aging, were observed to persist even after long-term aging. After very lengthy aging, the fine {gamma}{prime} phase particles were changed to coarser {gamma}{prime} lamellae at the grain boundary reaction front, which were alternately arranged with fine {alpha} lamellae that were estimated to have been transformed from the austenite-stabilizing-solute(Ni, C)-depleted {gamma} lamellae. The fine duplex {gamma}{prime} + {alpha} cellular product did not affect deleteriously the room-temperature tensile properties of the alloy. However, the cellular structure was observed to cause the grain boundary embrittlement of the aged alloy at elevated temperatures higher than 681 K.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 677962
- Journal Information:
- Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science, Journal Name: Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science Journal Issue: 6 Vol. 30; ISSN 1073-5623; ISSN MMTAEB
- Country of Publication:
- United States
- Language:
- English
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