SEDL / STP / STP128-EB / STP41683S

Effect of a Notch and of Hardness on the Rupture Strength of “Discaloy”

Hull, F. C.
ManagerResearch Engineer; Manager, Metallurgical and Ceramic Department, Westinghouse Electric Corp., Research Laboratories, East Pittsburgh, Pa

Hann, E. K.
ManagerResearch Engineer; Manager, Metallurgical and Ceramic Department, Westinghouse Electric Corp., Research Laboratories, East Pittsburgh, Pa

Scott, H.
ManagerResearch Engineer; Manager, Metallurgical and Ceramic Department, Westinghouse Electric Corp., Research Laboratories, East Pittsburgh, Pa

Pages: 10    Published: Jan 1953

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Abstract

Certain critical components of jet engines and gas turbines, such as the turbine rotor, require materials of low notch sensitivity at service temperatures around 1200 F. In an Fe-Ni-Cr-Mo-Ti austenitic alloy of attractive basic properties, the effects of hardness as varied by the hardener, titanium, have been related to the behavior of the material in the presence of a notch. Creep-rupture and notched bar rupture tests were conducted at 1000 and 1200 F. The plain bar rupture strength reached a maximum at a hardener content producing 2 per cent rupture strain, and the notched bar strength exceeded the plain bar strength in material in which the creep specimen had more than 5 per cent rupture strain.