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ASTM Selected Technical Papers
Thermal Fatigue of Materials and Components
By
DA Spera
DA Spera
1
NASA Lewis Research Center
,
editor
Search for other works by this author on:
DF Mowbray
DF Mowbray
2
Mechanics of Materials Unit, Materials and Processes Laboratory, General Electric Company
,
Schenectady, N.Y.
;
symposium cochairman and also coeditor of this publication
.
Search for other works by this author on:
ISBN-10:
0-8031-0586-X
ISBN:
978-0-8031-0586-7
No. of Pages:
270
Publisher:
ASTM International
Publication date:
1976

Strain-controlled thermomechanical fatigue tests were performed on two nickel-base superalloys, directionally solidified (DS) Mar-M200 plus hafnium and conventionally cast B-1900 plus hafnium. The DS alloy was tested at various angles (θ) to the direction of grain growth. It was found that crack growth rates were a minimum for the DS alloy tested parallel to the direction of grain growth (crack propagating normal to the direction of grain growth). The crack growth rate increased for other orientations in the sequence θ = 15, 30 or 90, and 45 deg until equivalence was reached with rates for the conventionally cast alloy, B-1900 plus hafnium. A linear elastic fracture mechanics approach was extended to strain-controlled crack growth as a function of θ for the DS alloy. Prediction of crack growth rates as a function of ϑ was achieved by normalizing with the elastic modulus. The sequencing of crack growth rates with θ and a smooth-to-rough fracture surface transition are explained on the basis of the orientation dependence of crack opening displacement for a given strain intensity range.

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