Cyclic strain rate effect on martensitic transformation and fatigue behaviour of an austenitic stainless steel
| Autor: | Robert D. Moser, Nima Shamsaei, J. A. Schneider, Shuai Shao, Jonathan Pegues |
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| Rok vydání: | 2017 |
| Předmět: |
Materials science
Mechanical Engineering Alloy Metallurgy technology industry and agriculture 02 engineering and technology engineering.material Strain rate Strain hardening exponent 021001 nanoscience & nanotechnology 020303 mechanical engineering & transports 0203 mechanical engineering Mechanics of Materials Martensite Diffusionless transformation Volume fraction Hardening (metallurgy) engineering General Materials Science Austenitic stainless steel 0210 nano-technology |
| Zdroj: | Fatigue & Fracture of Engineering Materials & Structures. 40:2080-2091 |
| ISSN: | 1460-2695 8756-758X |
| Popis: | In this study, the effect of strain rate on the cyclic behaviour of 304L stainless steel is investigated to unveil the complex interrelationship between martensitic phase transformation, secondary hardening, cyclic deformation and fatigue behaviour of this alloy. A series of uniaxial strain controlled fatigue tests with varying cyclic strain rates were conducted at zero and non-zero mean strain conditions. Secondary hardening was found to be closely related to the volume fraction of strain-induced martensite which was affected by adiabatic heating due to increasing cyclic strain rates. Tests with lower secondary hardening rates maintained lower stress amplitudes during cyclic loading which resulted in longer fatigue lives for similar strain amplitudes. Fatigue resistance of 304L stainless steel was found to be more sensitive to changes in strain rate than the presence of mean strain. The mean strain effect was minimal due to the significant mean stress relaxation in this material. |
| Databáze: | OpenAIRE |
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