Difference in thermal and mechanical stabilities of austenite between carbon- and nitrogen-added metastable austenitic stainless steels
| Autor: | Nobuo Nakada, Takuro Masumura, Kazuhiko Adachi, Tamotsu Koyano, Toshihiro Tsuchiyama, Setsuo Takaki |
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| Jazyk: | angličtina |
| Rok vydání: | 2015 |
| Předmět: |
Austenite
Materials science Polymers and Plastics Metallurgy Metals and Alloys chemistry.chemical_element Microstructure Electronic Optical and Magnetic Materials chemistry Stacking-fault energy Martensite Ceramics and Composites Deformation (engineering) Dislocation Carbon Electron backscatter diffraction |
| Zdroj: | Acta Materialia. 84 |
| Popis: | In order to evaluate the effects of carbon and nitrogen addition on the stability of austenite, athermal and deformation-induced α′-martensitic transformation behaviors were investigated using type 304-metastable austenitic stainless steels containing 0.1 mass% carbon or nitrogen. The difference in the development of the deformation microstructure in particular is discussed in terms of the stacking-fault energy (SFE). Since carbon-added steel has a lower SFE than that of nitrogen-added steel, deformation twins and e-martensite were preferentially formed in the carbon-added steel, whereas a dislocation cell structure developed in the nitrogen-added steel. Crystallographic analysis using the electron backscatter diffraction method revealed that the difference in the deformation microstructure has a significant influence on the growth behavior of deformation-induced α′-martensite, that is, the interface of the deformation twins and e-martensite suppresses the growth of α′-martensite, whereas dislocation cell boundaries are not effective. As a result, the mechanical stability of carbon-added steel is slightly higher than that of nitrogen-added steel, although the thermal stabilization effect of carbon is much lower than that of nitrogen. |
| Databáze: | OpenAIRE |
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