Low-cycle fatigue deformation characteristics of Haynes {reg{underscore}sign} HR-120{reg{underscore}sign} alloy

Conference · Thu Jul 01 04:00:00 EDT 1999

OSTI ID:20014210

Liaw, P K; He, Y H; Miller, L; Huang, M; Brooks, C R; Seeley, R R; Klarstrom, D L

Low-cycle fatigue deformation characteristics of HAYNES HR-120 alloy at room and high temperatures were studied under axial strain control. Test results show that there is a significant effect of test temperature on the low-cycle fatigue behavior of HAYNES HR-120 alloy. It was found that the alloy could cyclically harden at moderately high temperatures (649 C and 871 C), but generally cyclically soften at room temperature (24 C) and high temperature (982 C). However, the variation of the stress amplitude with cycles at the temperatures of 24 C and 982 C depended on the total strain range. The significant cyclic hardening of the alloy occurred at the high total strain ranges of 1.5% and 2.0% during the beginning state of the test at both 24C and 982 C. Microstructural analyses indicated that the cyclic hardening behavior of the alloy at the test temperature of 649 C could be related to the formation of a number of deformation bands. Nevertheless, increasing the test temperature to 871 C, cyclic hardening was attributed to the precipitation of secondary-phase particles. Furthermore, it was also found that the coarsening of secondary-phase particles brought about cyclic softening of the alloy at the high temperature of 982 C. Coffin-Manson equations and Holloman equations were given for HAYNES HR-120 alloy at different temperatures.

• Research Organization: Univ. of Tennessee, Knoxville, TN (US)
• OSTI ID: 20014210
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CHROMIUM ALLOYS
DEFORMATION
EXPERIMENTAL DATA
FATIGUE
HEAT RESISTING ALLOYS
IRON ALLOYS
MICROSTRUCTURE
NICKEL ALLOYS
STRAIN HARDENING
STRAIN SOFTENING
TEMPERATURE DEPENDENCE