EFFECT OF CREEP-EXPOSURE ON MECHANICAL PROPERTIES OF RENE 41. PART II: STRUCTURAL STUDIES, SURFACE EFFECTS, AND RE-HEAT TREATMENT
Technical Report
·
OSTI ID:4792758
The effect of creep-exposure on room temperature mechanical properties of Rene 41 was studied for temperatures of 1200 to l800 deg F and times up to 200 hours. Unstressed exposures were for as long as 2012 hours at 1700 deg F. Thermally-induced structural changes reduced strength and ductility after exposures at l400 to 1800 deg F. Reduced yield strength was due to decreased volume fraction of gamma prime and secondarily to an increase in the particle size. Ductility was reduced by formation of massive grain boundary carbides. Up to l500 deg F, creep caused strain hardening and Bauschinger effects. Except for surface effects, damage was restorabie by re-heat treatment. Yield strength was restored by re-solution and re-aging to produce fine gamma prime. Complete re- solution of earbides was required to restore ultimate strength and ductility. Microcracking was not observed. Creep induced intergranular surface cracking at 1200 to l300 deg F which reduced ductility. Surface effects for exposures above 1400 deg F were thermally induced. General principles were formulated for damage to properties of nickel-base alloys. (auth)
- Research Organization:
- Michigan. Univ., Ann Arbor
- NSA Number:
- NSA-16-010504
- OSTI ID:
- 4792758
- Report Number(s):
- ASD-TR-61-73(Pt.II)
- Country of Publication:
- United States
- Language:
- English
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