Effect of cold rolling on the precipitation behavior of {delta} phase in INCONEL 718
- Yanshan Univ., Qinhuangdao, Hebei (China). Dept. of Materials Science and Engineering
- Shenyang Liming Engine Mfg. Co., Liaoning (China)
Systematic research has been undertaken on the effect of cold rolling on the precipitation kinetics of {delta} phase in INCONEL 718. Above 910 C, cold rolling promotes the precipitation of {delta} phase. Below 910 C, the precipitation of {delta} phase is still preceded by the {gamma}{double_prime} precipitation in cold-rolled INCONEL 718. Cold rolling promotes not only the precipitation of {gamma}{double_prime} phase but also the {gamma}{double_prime} {r_arrow} {delta} transformation. The relationship between the weight percentage of {delta} phase and aging time follows the Avrami equation. Below 910 C, as cold rolling reduction and temperature increase, the time exponent (n) decreases, whereas the rate of {delta} precipitation increases. The apparent activation energy of {delta} precipitation varies in the range of 1113 to 577 kJ/mol for 25 to 65% cold-rolled INCONEL 718 and decreases as cold rolling reduction increases. Precipitation-time-temperature (PTT) diagrams have been determined for the four cold-rolled INCONEL 718. The noses of the PTT curves are located at about 910 C. These curves are shifted significantly to longer times as cold rolling reductions decrease.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 316067
- Journal Information:
- Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science, Vol. 30, Issue 1; Other Information: PBD: Jan 1999
- Country of Publication:
- United States
- Language:
- English
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