Austenite grain coarsening behaviour in a medium carbon Si-Cr spring steel with and without vanadium
| Autor: | Dierk Raabe, Dirk Ponge, Fei Li, Araz Ardehali Barani |
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| Předmět: |
Austenite
Materials science Carbon steel Metallurgy Metals and Alloys Vanadium chemistry.chemical_element Abnormal grain growth engineering.material Condensed Matter Physics Grain size Spring steel Grain growth chemistry Materials Chemistry engineering Physical and Theoretical Chemistry Grain boundary strengthening |
| Zdroj: | Scopus-Elsevier |
| Popis: | The austenite grain coarsening behaviour in a medium carbon Si-Cr spring steel with and without vanadium was investigated by the thermal etching method. This method is efficient when the austenitization temperature is not lower than 900 °C. The average grain sizes on the surfaces of the samples determined by thermal etching vary little from those in the bulk as revealed by chemical etching. The austenite grain coarsening behaviour of the steel with vanadium can be classified in three temperature regimes. Below a critical temperature the vanadium addition is effective to impede grain growth and fine grains are observed. The austenite grain size was significantly smaller than in the steel without vanadium. In a medium temperature regime the steel with vanadium exhibits a bimodal grain size distribution. Above the dissolution temperature of vanadium carbides normal grain growth is observed. An equation was set up to predict the grain coarsening behaviour in the steel without vanadium. The results show how the austenite grain size, which is very important for the toughness and ductility of the spring steels, can be controlled by microalloying with vanadium. |
| Databáze: | OpenAIRE |
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