A thermodynamic model on predicting density of medium-Mn steels with experimental verification

A new model on predicting the density of hot-rolled multi-phased medium-Mn steel has been presen ted on the basis of thermodynamic calculations. This is an integrated model, which includes one for calculating the retained austenite （RA） fraction and the other for volume expansion during the aus teni...

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Bibliographic Details
Published in:Journal of iron and steel research, international international, 2017-11, Vol.24 (11), p.1078-1084
Main Authors: Shen, Guo-hui, Wen, Peng-yu, Luo, Hai-wen
Format: Article
Language:English
Subjects:
Applied and Technical Physics
Density
Engineering
Machines
Manufacturing
Materials Engineering
Materials Science
Medium-Mn steel
Metallic Materials
Physical Chemistry
Processes
Retained austenite fraction
Transformation
Volume expansion
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Summary:A new model on predicting the density of hot-rolled multi-phased medium-Mn steel has been presen ted on the basis of thermodynamic calculations. This is an integrated model, which includes one for calculating the retained austenite （RA） fraction and the other for volume expansion during the aus tenite-to martensite transformation, because both of them are key parameters for calculating the den- sity of steel at ambient temperature. The existing empirical equations for calculating Mx temperature and lattice constants of both martensite and austenite have been all rcassessed by the XRD measure ments on the microstructures of seven hot-rolled medium-Mn steels. Finally, the densities ot seven steels were calculated merely from compositions and compared with the measured ones. The differ ence between them is no more than 1 %, suggesting that the presented model should be of good value in designing the low density steels.
ISSN:1006-706X
2210-3988
DOI:10.1016/S1006-706X(17)30157-7