<abstract xmlns="http://www.w3.org/1999/xhtml"><p> The purpose of the present paper is to demonstrate how a thermodynamic method can be used for solving a problem of the decarburisation of bainite laths and carbon diffusion distances in the matrix of ADI. This should in principle enable to examine the partitioning of carbon from supersaturated ferrite laths into adjacent austenite and the carbon content in retained austenite using analytical method. The paper presents an investigation of the time required for the diffusion of carbon out of supersaturated laths of ferrite into the retained austenite. A consequence of the precipitation of cementite from austenite during austempering is that the growth of bainitic ferrite can continue to larger extent and that the resulting microstructure is not an ausferrite but it is a mixture of bainitic ferrite, retained austenite and carbides. In case of this microstructure the product of austempering reaction in ductile iron is rather bainite than “ausferrite”.</p></abstract>

The purpose of the present paper is to demonstrate how a thermodynamic method can be used for solving a problem of the decarburisation of bainite laths and carbon diffusion distances in the matrix of ADI. This should in principle enable to examine the partitioning of carbon from supersaturated ferrite laths into adjacent austenite and the carbon content in retained austenite using analytical method. The paper presents an investigation of the time required for the diffusion of carbon out of supersaturated laths of ferrite into the retained austenite. A consequence of the precipitation of cementite from austenite during austempering is that the growth of bainitic ferrite can continue to larger extent and that the resulting microstructure is not an ausferrite but it is a mixture of bainitic ferrite, retained austenite and carbides. In case of this microstructure the product of austempering reaction in ductile iron is rather bainite than “ausferrite”.

AUSFERRITIC OR BAINITIC TRANSFORMATION IN ADI

University of Technology and Life Sciences, Mechanical Engineering Faculty, Department of Materials Science and Engineering, av. Kaliskiego 7, 85-789 Bydgoszcz, Poland

Advances in Materials Science

{"article-title":"AUSFERRITIC OR BAINITIC TRANSFORMATION IN ADI"}

The purpose of the present paper is to demonstrate how a thermodynamic method can be used for solving a problem of the decarburisation of bainite laths and...

AUSFERRITIC OR BAINITIC TRANSFORMATION IN ADI

Publié en ligne: 25 janv. 2014

Pages: 9 - 18

DOI: https://doi.org/10.2478/adms-2013-0015

This content is open access.