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http://dx.doi.org/10.9726/kspse.2017.21.6.013

Effect of Aging Time on Creep Property of Cast Haynes 282 Superalloy  

Kim, Young-Ju (Department of Materials Sci. & Eng. Pukyong National University)
Ahn, Yong-Sik (Department of Materials Sci. & Eng. Pukyong National University)
Publication Information
Journal of Power System Engineering / v.21, no.6, 2017 , pp. 13-20 More about this Journal
Abstract
Ni-base superalloy Haynes 282 was developed as a gas turbine material for use in the ultra-super-critical stage (USC) of next-generation coal-fired power plants. Temperatures in the USC stage exceed $700^{\circ}C$ during operation. In spite of its important role Haynes 282 in increasing the performance of high-pressure turbines, as a result of its high-temperature capability, there is little information on the microstructure, deformation mechanism, or mechanical properties of the cast condition of this alloy. The aim of present study is to examine the creep properties of cast alloy and compare with wrought alloy. The ${\gamma}^{\prime}-precipitates$ were coarsen with the increase of aging time ranging from 8 to 48 hrs. A creep test performed at $750^{\circ}C$ showed faster minimum creep rate and shorter rupture lifetime with the aging time. A creep test performed showed only a slight difference in the rupture life between cast and wrought products. Based on the creep test results, the deformation mechanism is discussed using fractographs.
Keywords
Ni-Base Superalloy; Cast Condition; Creep; Aging Effect; ${\gamma}^{\prime}-precipitate$;
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