On the strain-induced martensitic transformation process of the commercial AISI 304 stainless steel during cyclic loading

•Crystal defects acts as nucleation sites for martensite.•Cyclic-induced martensite transformation depends strongly on the initial material state.•Dislocation movement is impaired in a material with a high defects density and martensitic transformation occurs.•A material with low defects density can...

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Bibliographic Details
Published in:International journal of fatigue 2020-11, Vol.140, p.105809, Article 105809
Main Authors: Farias, F., Alvarez-Armas, I., Armas, A.F.
Format: Article
Language:English
Subjects:
Austenitic stainless steel
Austenitic stainless steels
Correlation analysis
Crystal defects
Cyclic loads
Fatigue tests
Hardening
Heat treating
Hysteresis loops
Low cycle fatigue
Martensite
Martensitic transformations
Materials fatigue
Microstructure
Nucleation
Strain-induced martensite
TEM
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Summary:•Crystal defects acts as nucleation sites for martensite.•Cyclic-induced martensite transformation depends strongly on the initial material state.•Dislocation movement is impaired in a material with a high defects density and martensitic transformation occurs.•A material with low defects density can accumulate more plastic deformation and fatigue life is improved.•During cyclic load, friction stresses are higher than back stresses in a material with high defects density. Low-cycle fatigue tests were performed on metastable austenitic steel at two initial material states, the as-received, with a high crystal defect density, and the solution treated one, with fewer crystal defects. Cyclic curves have shown different hardening behavior depending on the initial material states. To understand these differences, the back and friction stresses were studied from the hysteresis loop analysis. The correlation of these results with the volume fraction of induced martensite and the observed microstructure revealed that the cyclic hardening behavior strongly depends on the existence of potential martensite nucleation sites.
ISSN:0142-1123
1879-3452
DOI:10.1016/j.ijfatigue.2020.105809