Martensite transformation from ultrafine-grained (UFG) austenite fabricated by the accumulative roll-bonding (ARB) process in an Fe-28.5 at.% Ni alloy was studied. The sheet ARB processed by five cycles (equivalent strain: ε = 4.0) showed the ultrafine lamellar austenite grains with the mean lamella
Martensite → austenite phase transformation kinetics in an ultrafine-grained metastable austenitic stainless steel
✍ Scribed by S. Rajasekhara; P.J. Ferreira
- Publisher
- Elsevier Science
- Year
- 2011
- Tongue
- English
- Weight
- 879 KB
- Volume
- 59
- Category
- Article
- ISSN
- 1359-6454
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✦ Synopsis
A generalized phase transformation kinetics model is used to understand the martensite to austenite transformation in a cold-rolled and annealed metastable AISI 301LN ultrafine-grained austenitic stainless steel. The model shows that the presence of interstitial nitrogen and heavy cold-rolling is important to promote fast transformation kinetics, through rapid nitrogen-diffusion and austenite nucleation at austenite/martensite phase boundaries.
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