The effect of aluminium and phosphorus on the stability of individual austenite grains in TRIP steels |
| |
| Authors: | E. Jimenez-Melero N.H. van Dijk L. Zhao J. Sietsma S.E. Offerman J.P. Wright S. van der Zwaag |
| |
| Affiliation: | 1. Fundamental Aspects of Materials and Energy, Faculty of Applied Sciences, Delft University of Technology, Mekelweg 15, 2629 JB Delft, The Netherlands;2. Materials Innovation Institute M2i, Mekelweg 2, 2628 CD Delft, The Netherlands;3. Department of Materials Science and Engineering, Delft University of Technology, Mekelweg 2, 2628 CD Delft, The Netherlands;4. European Synchrotron Radiation Facility, 6 Rue Jules Horowitz, BP 220, 38043 Grenoble Cedex, France;5. Faculty of Aerospace Engineering, Delft University of Technology, Kluijverweg 1, 2629 HS Delft, The Netherlands |
| |
| Abstract: | We have performed in situ synchrotron X-ray diffraction experiments to assess the influence of aluminium and phosphorus on the austenite stability in low-alloyed transformation-induced plasticity steels during the high-temperature bainitic holding and the subsequent martensitic transformation during cooling to temperatures between room temperature and 100 K. Although the addition of aluminium increases the chemical driving force for the formation of bainitic ferrite plates significantly, the phosphorus exerts a larger influence on the bainitic transformation kinetics. Consequently, the addition of phosphorus leads to a higher degree of carbon enrichment and a narrower grain volume distribution of the metastable austenite. The stability of the individual austenite grains with respect to their martensitic transformation depends on both the local carbon content and the grain volume for austenite grains smaller than 20 μm3. The presence of aluminium and phosphorus further stabilizes the austenite grains. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
