Isothermal and thermomechanical fatigue of type 316 stainless steel

Conference · Tue Dec 31 04:00:00 EST 1996

OSTI ID:531472

Zamrik, S Y; Davis, D C; Firth, L C ^[1]

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1. Pennsylvania State Univ., University Park, PA (United States). Dept. of Engineering Science

Discussed is the thermomechanical fatigue (TMF) life of Type 316 stainless steel under in-phase and out-of-phase cycling and a comparison with the isothermal fatigue case. The TMF tests were conducted in air over a temperature range of 399 C (750 F) to 621 C (1,150 F) at several mechanical strain ranges: {Delta}{var_epsilon}{sub m} = 0.4% through 1.0%. The isothermal fatigue data were from total strain range ({Delta}{var_epsilon}{sub m} = 0.35%, 0.5%, 0.68% and 1.0%) tests conducted at 621 C (1,150 F). The results show that in-phase TMF is the most damaging cycle for Type 316 stainless steel at the high strain range levels ({Delta}{var_epsilon}{sub m} > 0.7%), followed by isothermal fatigue cycling at 621 C (1,150 F) and then out-of-phase TMF cycling. The out-of-phase TMF life curve was observed to cross over the isothermal fatigue life curve at {Delta}{var_epsilon}{sub m} {approx_equal} 0.6%, and the trend of the data indicate that the out-of-phase TMF life curve will cross over the in-phase TMF life curve at {Delta}{var_epsilon}{sub m} < 0.4%, and become the most damaging cycle type at the lower strain range levels.

• Sponsoring Organization: National Science Foundation, Washington, DC (United States); Oak Ridge National Lab., TN (United States); National Aeronautics and Space Administration, Washington, DC (United States)
• OSTI ID: 531472
• Report Number(s): CONF-941159--; ISBN 0-8031-2001-X
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
COMPARATIVE EVALUATIONS
CREEP
FATIGUE
PETROLEUM REFINERIES
REACTOR MATERIALS
SERVICE LIFE
STAINLESS STEEL-316
THERMAL FATIGUE