SYMPOSIA PAPER Published: 01 January 1996

Isothermal and Thermomechanical Fatigue of Type 316 Stainless Steel


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 (1150‡F) at several mechanical strain ranges: δεm = 0.4% through 1.0%. The isothermal fatigue data were from total strain range (δεm = 0.35%, 0.5%, 0.68% and 1.0%) tests conducted at 621‡C (1150‡ F). The results show that in-phase TMF is the most damaging cycle for Type 316 stainless steel at the high strain range levels (δεm > 0.7%), followed by isothermal fatigue cycling at 621‡C (1150‡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 δεm ≅ 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 δεm < 0.4%, and become the most damaging cycle type at the lower strain range levels.

Author Information

Zamrik, SY
The Pennsylvania State University, University Park, PA
Davis, DC
The Pennsylvania State University, University Park, PA
Firth, LC
The Pennsylvania State University, University Park, PA
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Developed by Committee: E08
Pages: 96–116
DOI: 10.1520/STP16449S
ISBN-EB: 978-0-8031-5325-7
ISBN-13: 978-0-8031-2001-3