Modelling of the fraction of martensite in low-alloy steels
2015 (English)In: MATERIALS TODAY-PROCEEDINGS, Elsevier, 2015, Vol. 2, 561-564 p.Conference paper (Refereed)Text
Thermodynamics-based modelling of the fraction of martensite formed upon quenching in low-alloy steels is developed. The adopted modelling approach has two distinct features: 1) it applies the driving force of the transformation, i.e. the difference of Gibbs energy between austenite and martensite, from thermodynamic calculations; 2) it predicts the sigmoidal shape of transformation to capture also the initial 10-20% of martensite formation, which is distinct from some previous modelling using e.g. the Koistinen-Marburger equation. It is found that the general equation can describe the experimental data of martensite fraction versus quenching temperature for plain carbon steels and low-alloy steels well. Furthermore, the only model parameter that is needed is linearly proportional to the martensite start temperature of the steel, which opens the possibility for a thermodynamics-based simple but yet predictive model if it is coupled with the previously developed thermodynamics-based model for the Ms temperature.
Place, publisher, year, edition, pages
Elsevier, 2015. Vol. 2, 561-564 p.
fraction of martensite, steels, thermodynamics, martensitic transformation
IdentifiersURN: urn:nbn:se:kth:diva-184078DOI: 10.1016/j.matpr.2015.07.347ISI: 000371032100017ScopusID: 2-s2.0-84955503812OAI: oai:DiVA.org:kth-184078DiVA: diva2:913893
14th International Conference on Martensitic Transformations (ICOMAT), JUL 06-11, 2014, Bilbao, SPAIN
QC 201603222016-03-222016-03-222016-03-22Bibliographically approved