Relationship between the lattice constant of {Upsilon} phase and the content of {delta} phase, {gamma}{double_prime} and {gamma}{prime} phases in Inconel 718
- Yanshan Univ., Qinhuangdao, Hebei (China). Dept. of Materials Science and Engineering
- Shenyang Liming Engine Mfg. Co., Liaoning (China)
Inconel 718, a Nb-modified nickel-base superalloy has been widely used in gas turbine and related applications due to its good mechanical properties and structural stability at elevated temperatures ({approximately}650 C). The mechanical properties of Inconel 718 depended on the austenite grain size and the size, morphology and content of {delta} phase, {gamma}{double_prime} and {gamma}{prime} phases. In a previous study, the {delta} phase content in Inconel 718 was measured by X-ray diffraction techniques. However, it was difficult to measure the content of {gamma}{double_prime} and {gamma}{prime} phases. M.G. Burke and M.K. Miller determined the composition of the {Upsilon} matrix by using analytical electron microscopy and atom probe field ion microscopy. Their results indicated that the composition of the {Upsilon} matrix changed due to the formation of the various precipitates. The variation in the composition of the {Upsilon} matrix affected the lattice constant of {Upsilon} phase, then the content of {delta} phase, {gamma}{double_prime} and {gamma}{prime} phases was thought to be associated with the lattice constant of {Upsilon} phase. In this paper, the lattice constant of {Upsilon} phase and the content of {delta} phase in Inconel 718 aged at 910 C for different times after cold rolling are measured by X-ray diffraction techniques. The lattice constant of {Upsilon} phase as a function of the content of {delta} phase, {gamma}{double_prime} and {gamma}{prime} phases is derived.
- OSTI ID:
- 516835
- Journal Information:
- Scripta Materialia, Vol. 37, Issue 1; Other Information: PBD: 1 Jul 1997
- Country of Publication:
- United States
- Language:
- English
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