Retransformation (α′→γ) kinetics of strain induced martensite in 304 stainless steel

Coupons of austenitic 304 stainless steel (γ) were transformed to approximately 90% martensite (α′) and 10% austenite by rolling at 77 K. Subsequently the reverse α′→γ transformation was instigated by heating the coupons to 680°C. The retransformation was monitored, in situ, by dilatometry and neutr...

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Bibliographic Details
Published in:Materials science & engineering. A, Structural materials : properties, microstructure and processing Structural materials : properties, microstructure and processing, 2000-03, Vol.280 (2), p.270-281
Main Authors: Stalder, M., Vogel, S., Bourke, M.A.M., Maldonado, J.G., Thoma, D.J., Yuan, V.W.
Format: Article
Language:English
Subjects:
Applied sciences
Cross-disciplinary physics: materials science
rheology
Exact sciences and technology
Kinetics
Martensite
Martensitic transformations
Materials science
Metals. Metallurgy
Phase diagrams and microstructures developed by solidification and solid-solid phase transformations
Physics
Stainless steel
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Summary:Coupons of austenitic 304 stainless steel (γ) were transformed to approximately 90% martensite (α′) and 10% austenite by rolling at 77 K. Subsequently the reverse α′→γ transformation was instigated by heating the coupons to 680°C. The retransformation was monitored, in situ, by dilatometry and neutron Bragg edge diffraction (BED). Results from the two techniques show good agreement and suggest that the transformation kinetics are best described by two Avrami exponents, n=2.5 and n=0.2 respectively. A limited discussion of the lattice parameter evolution during the transformation is included. Possible mechanisms for growth dynamics and stress relaxation are discussed.
ISSN:0921-5093
1873-4936
DOI:10.1016/S0921-5093(99)00706-6