TY - JOUR
T1 - The importance of steel chemistry and thermal history on the sensitization behavior in austenitic stainless steels
T2 - Experimental and modeling assessment
AU - Kolli, Satish
AU - Javaheri, Vahid
AU - Ohligschläger, Thomas
AU - Kömi, Jukka
AU - Porter, David
N1 - Funding Information:
The authors would like to thank Tornio R&D Center, Outokumpu for providing the material for the study. The authors are grateful for the this project that has received funding from the European Union's Horizon 2020 research and innovation programme under the Marie Skłodowska-Curie grant agreement No 675715.
Funding Information:
The authors would like to thank Tornio R&D Center, Outokumpu for providing the material for the study. The authors are grateful for the this project that has received funding from the European Union’s Horizon 2020 research and innovation programme under the Marie Skłodowska-Curie grant agreement No 675715 .
Publisher Copyright:
© 2020 The Authors
PY - 2020/9
Y1 - 2020/9
N2 - The sensitization of austenitic stainless steels is dependent on various factors such as chemical composition, heat treatment temperature and time. To study these effects, the degree of sensitization in five austenitic stainless steel compositions that were subjected to isothermal heat treatments in the temperature range 550–820 °C has been determined using double loop electrochemical potentiokinetic reactivation testing. The nucleation and growth of grain boundary M23C6 carbides, that are responsible for sensitization, has been modelled with the help of the precipitation and diffusion modules in Thermo-Calc, assuming local multicomponent equilibrium, flux balance at the carbide-matrix interface, to quantitatively predict the Cr depletion. Based on the Cr depletion characteristics, a depletion parameter has been established that can predict sensitization in austenitic stainless steels and predict the effects of individual alloying elements.
AB - The sensitization of austenitic stainless steels is dependent on various factors such as chemical composition, heat treatment temperature and time. To study these effects, the degree of sensitization in five austenitic stainless steel compositions that were subjected to isothermal heat treatments in the temperature range 550–820 °C has been determined using double loop electrochemical potentiokinetic reactivation testing. The nucleation and growth of grain boundary M23C6 carbides, that are responsible for sensitization, has been modelled with the help of the precipitation and diffusion modules in Thermo-Calc, assuming local multicomponent equilibrium, flux balance at the carbide-matrix interface, to quantitatively predict the Cr depletion. Based on the Cr depletion characteristics, a depletion parameter has been established that can predict sensitization in austenitic stainless steels and predict the effects of individual alloying elements.
KW - CALPHAD
KW - Diffusion
KW - Self-healing
KW - Sensitization
KW - Stainless steels
KW - Thermo-Calc
UR - http://www.scopus.com/inward/record.url?scp=85084800055&partnerID=8YFLogxK
U2 - 10.1016/j.mtcomm.2020.101088
DO - 10.1016/j.mtcomm.2020.101088
M3 - Article
AN - SCOPUS:85084800055
VL - 24
JO - Materials Today Communications
JF - Materials Today Communications
SN - 2352-4928
M1 - 101088
ER -