Crack growth behavior of a single crystal superalloy
Conference
·
· TMS (The Metallurgical Society) Paper Selection; (USA)
OSTI ID:5442535
- General Electric Company, Evendale, OH (USA)
The crack growth behavior of the single crystal superalloy, Rene' N4, was determined for a wide range of crystal orientations and temperatures. Crystal orientation was varied from (001) and (110) and (111) and showed only a modest influence on crack growth rate. Test temperature was varied from 800 to 2000 F and influence high and low growth rate portions of the da/dn-{Delta}K curves differently. At high {Delta}K (Paris Law Regime) growth rate was lowest near 1200 F and increased at lower and higher temperatures. Crack growth modes in all specimens were in Opening Mode I at low {triangle}K, with noncrystallographic surfaces. At high {Delta}K, growth transitioned into a crystallographic mixed mode fracture on (111) planes.
- OSTI ID:
- 5442535
- Report Number(s):
- CONF-840909--
- Conference Information:
- Journal Name: TMS (The Metallurgical Society) Paper Selection; (USA) Journal Volume: 56
- Country of Publication:
- United States
- Language:
- English
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