Effect of Heterogeneous Microstructure on Refining Austenite Grain Size in Low Alloy Heavy-Gage Plate
| Autor: | R. D. K. Misra, Jingliang Wang, Longhao Zhu, Ling Yan, Shengfu Yuan, Zhenjia Xie, Chengjia Shang |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Equiaxed crystals
lcsh:TN1-997 nucleation site Materials science Alloy Nucleation 02 engineering and technology engineering.material 01 natural sciences Ferrite (iron) 0103 physical sciences heterogeneous microstructure General Materials Science grain refinement lcsh:Mining engineering. Metallurgy 010302 applied physics Quenching Austenite alloying element enrichment Acicular Metallurgy Metals and Alloys 021001 nanoscience & nanotechnology Martensite engineering 0210 nano-technology |
| Zdroj: | Metals, Vol 10, Iss 1, p 132 (2020) Metals Volume 10 Issue 1 |
| ISSN: | 2075-4701 |
| Popis: | The present work introduces the role of heterogeneous microstructure in enhancing the nucleation density of reversed austenite. It was found that the novel pre-annealing produced a heterogeneous microstructure consisting of alloying elements-enriched martensite and alloying-depleted intercritical ferrite. The shape of the martensite at the prior austenite grain boundary was equiaxed and acicular at inter-laths. The equiaxed reversed austenite had a K-S orientation with adjacent prior austenite grain, and effectively refined the prior austenite grain that it grew into. The alloying elements-enriched martensite provided additional nucleation sites to form equiaxed reversed austenite at both prior austenite grain boundaries and intragranular inter-lath boundaries during re-austenitization. It was revealed that prior austenite grain size was refined to ~12 &mu m by pre-annealing and quenching, while it was ~30 &mu m by conventional quenching. This is a practical way of refining transformation products by refining prior austenite grain size to improve the strength, ductility and low temperature toughness of heavy-gage plate steel. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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