ISSN:
1662-8985
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Non-destructive evaluation (NDE) techniques offer the potential advantage of achievingfast throughput microstructural characterization as well as monitoring that could be extremelyvaluable in assessing the mechanical integrity of turbine engine components. It is well known thatthe γ′ precipitate size and distribution can often determine the mechanical strength of nickel basealloys.In this investigation, Waspaloy, an age-hardening superalloy, was chosen as the candidate toproduce varied microstructures, which were subsequently characterized via the DC four-proberesistivity method. Specimens with average grain sizes of 13, 52 and 89 μm were obtained uponsolutionizing at 1045°C, 1090°C and 1145°C respectively. The specimens were annealed at 1045°Cto stabilize the vacancy concentration prior to aging at 800°C for times ranging from 0.1 to 100hours. Sub-grain microstructures examined in the SEM showed progressive growth of γ′ precipitateswith increased aging duration in all cases. The measurements of DC four-probe resistivity showed aconsistent drop in the resistivity with increased aging time, which was concurrent with the growthof the precipitates
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/01/39/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.15-17.876.pdf
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