Abstract
The effects of the working temperature, working reduction ratio, and post cooling rate on the microstructural change, retained austenite characteristics, and shear properties of 22SiMnCrMoB transformation-induced plasticity (TRIP)-aided martensitic (TM) steel were investigated. The slow cooling rate at 1 °C/s after warm working at 650 °C with a reduction ratio of 40-60% refined the grain size to 1-2 μrn and considerably increased the volume fraction of retained austenite, although the matrix structure changed to a granular bainitic ferrite structure, with the decreased volume fractions of the martensite-austenite constituent (MA)-like phase and carbide. On the other hand, the rapid cooling at 20 °C/s performed after the same warm working resulted in a refined lath martensite structure matrix and a large amount of the MA-like phase, although the volume fraction of retained austenite was small because of the precipitation of a large amount of carbides at the wide lath martensite. High shear strength, large shear elongation, and a superior combination of shear strength and shear ductility were attained by performing a rapid cooling after the warm working. AISTech 2015 Proceedings
| Original language | English |
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| Title of host publication | AISTech 2015 - Proceedings of the Iron and Steel Technology Conference and ICSTI 2015 |
| Publisher | Association for Iron and Steel Technology, AISTECH |
| Pages | 3426-3434 |
| Number of pages | 9 |
| Volume | 3 |
| ISBN (Electronic) | 9781935117476 |
| Publication status | Published - 2015 |
| Externally published | Yes |
| Event | AISTech 2015 Iron and Steel Technology Conference and 7th International Conference on the Science and Technology of Ironmaking, ICSTI 2015 - Cleveland, United States Duration: 2015 May 4 → 2015 May 7 |
Other
| Other | AISTech 2015 Iron and Steel Technology Conference and 7th International Conference on the Science and Technology of Ironmaking, ICSTI 2015 |
|---|---|
| Country/Territory | United States |
| City | Cleveland |
| Period | 15/5/4 → 15/5/7 |
Keywords
- Retained austenite
- TRIP-aided martensitic steel
- Ultra fine grain
- Warm working
ASJC Scopus subject areas
- Industrial and Manufacturing Engineering