Thermomechanical Fatigue Behavior of the Ferritic Stainless Steel

Abstract:

A thermomechanical fatigue (TMF) life prediction model for ferritic stainless steel, used in exhaust manifold of automobile, was developed based on Tomkins’ two-dimensional crack propagation model. Low-cycle fatigue (LCF) and TMF tests were carried out in a wide temperature range from 200 to 650°C. New concept of plastic strain range on TMF was proposed. Effective stress concept was introduced to get a reasonable stress range in TMF hysteresis loop. The proposed model predicted TMF life within 2X scatter band. The experimental results reveal that TMF life is about 10% of isothermal fatigue life.

• Periodical: Key Engineering Materials (Volumes 297-300)
• Pages: 1146-1151
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.297-300.1146
• Online since: November 2005
• Authors: Keum Oh Lee, Seong Gu Hong, Sam Son Yoon, Soon Bok Lee
• Keywords: Effective Stress, Low Cycle Fatigue, Thermo-Mechanical Fatigue (TMF), Tomkins Model

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