ENVIRONMENTAL DAMAGE OF CAST Ni-BASE SUPERALLOY K17
GUO Jianting;HUANG Rongfang;YANG Hongcai;MA Jun Institute of Metal Research; Academai Sinica; Shenyang; Northeast University of Technology Shenyang
Cite this article:
GUO Jianting;HUANG Rongfang;YANG Hongcai;MA Jun Institute of Metal Research; Academai Sinica; Shenyang; Northeast University of Technology Shenyang. ENVIRONMENTAL DAMAGE OF CAST Ni-BASE SUPERALLOY K17. Acta Metall Sin, 1988, 24(4): 270-275.
Abstract Rupture and tensile properties of K17 before and after thermal expo-sure in vacuum, air and hot corrosion environments have been investigated. Theresults show that vacuum exposure essentially does not affect the rupture lives, butit results in the decrease of high temperature tensile strength and increases of rup-ture and high temperature tensile ductilities; air or hot corrosion environmental ex-posure make the alloy degradation: severely reduce the rupture and high temperaturetensile properties, hot corrosion environmental exposure being more harmful. Theformer causes grain boundary oxidation and depletion of Cr, and the later makesthe sulphurization at grain boundaries. That results in the concentration of S anddepletion of Cr at grain boundaries and, consequently, weakens the grain bounda-ries.
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