Study of relationship between damage and amount of α'-martensite in AISI 321 steel after low-cycle fatigue
| Autor: | V. V. Mishakin, Konstantin Kurashkin |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
010302 applied physics
Materials science Hydrostatic weighing Fatigue damage 02 engineering and technology Slip (materials science) 021001 nanoscience & nanotechnology 01 natural sciences law.invention law Diffusionless transformation Martensite 0103 physical sciences Eddy current Low-cycle fatigue Composite material 0210 nano-technology Chemical composition |
| Zdroj: | Materials Today: Proceedings. 38:1772-1775 |
| ISSN: | 2214-7853 |
| DOI: | 10.1016/j.matpr.2020.08.260 |
| Popis: | The effect of martensitic transformation on the fatigue damage of AISI 321 stainless steel is investigated. After low-cycle fatigue testing five batches of AISI 321 steel, several specimens were selected, which significantly differed in the amount of α'-martensite measured by the eddy current method. The influence of the variations in chemical composition on the maximum amount of strain-induced α'-martensite is discussed. With an increase in amount of α'-martensite, an increase in shear bands intersections was observed on the optical micrographs. The material density measurements were carried out by hydrostatic weighing. The density reduction resulting from fatigue was quantified. It is shown that a decrease in density linearly depends on the amount of strain-induced α'-martensite formed in the fatigue-damaged material. It is concluded that the effects of damage accumulation and martensitic transformation on the density reduction are inseparable, since both are caused by the same mechanism – the slip of dislocations and the increase in the density of dislocations. |
| Databáze: | OpenAIRE |
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