Precipitation hardening in Inconel* 625
Authors: Shaikh, M.A.; Ahmad, M.; Shoaib, K.A.; Akhter, J.I.; Iqbal, M.
Source: Materials Science and Technology, Volume 16, Number 2, February 2000 , pp. 129-132(4)
Publisher: Maney Publishing
Abstract:The hardness of the nickel based superalloy Inconel 625, aged at 625, 700, and 760°C for different intervals of time ranging from 1 to 335 h, has been measured. Peak hardening is found to occur much earlier at 760°C than at 700°C. Also the peak hardness is higher at 700°C than at 760°C. The results have been discussed in terms of precipitation. Scanning electron microscopy revealed the presence of precipitates in specimens aged at 760°C for a longer time. Electron probe microanalysis results show these precipitates to be rich in Ni, Nb, and Mo indicating that these are ″ precipitates of Ni3 (Nb, Mo) type. Transmission electron microscopy confirmed that these are ″ precipitates. It also suggests that nucleation takes place heterogeneously on dislocations and stacking faults. Longer aging causes somewhat uniform nucleation but still preferentially on the secondary defects. At 700°C ′ precipitates have been observed in addition to ″ precipitates. The orientation relationship between the precipitates and the matrix has also been determined.
Document Type: Regular Paper
Affiliations: Radiation Damage Group, Nuclear Physics Division, Pakistan Institute of Nuclear Science and Technology, Islamabad, PO Nilore, Pakistan
Publication date: February 2000
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