Simple and Precise Description of the Transformation Kinetics and Final Structure of Dual Phase Steels

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60162694%3AG43__%2F21%3A00556935" target="_blank" >RIV/60162694:G43__/21:00556935 - isvavai.cz</a>

Result on the web

<a href="https://www.mdpi.com/1996-1944/14/7/1781" target="_blank" >https://www.mdpi.com/1996-1944/14/7/1781</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.3390/ma14071781" target="_blank" >10.3390/ma14071781</a>

Result language

angličtina

Original language name

Simple and Precise Description of the Transformation Kinetics and Final Structure of Dual Phase Steels

Original language description

The kinetics of diffusion-dependent phase transformations (including austenitisation of ferrite in dual steels or ferritic nodular cast irons) is very often described by the Johnson-Mehl-Avrami-Kolmogorov (JMAK) equation. This description is not complete when the conversion is only partial due to insufficient overheating, as the equilibrium fraction of ferrite transformed into austenite cannot be determined directly from the JMAK equation. Experimental kinetic curves of partial austenitisation at various temperatures can be fitted using the JMAK equation, but the equilibrium fraction of the newly formed phase for each temperature has to be calculated as a regression parameter. In addition, the temperature dependence of the kinetic exponent in the JMAK equation is quite complicated and cannot be expressed by a simple general function. On the contrary, the equation of autoinhibition used for the description of austenitisation kinetics in present work directly gives the equilibrium fraction at partial conversion. It describes transformation kinetics at various temperatures independently of whether the conversion is complete or partial. Rate constants of the equation of autoinhibition depend on temperature according to the Arrhenius equation. In addition, the equation of autoinhibition has no weakness as the JMAK equation has, which consists in questionable temperature dependence of kinetic exponent.

Czech name

—

Czech description

—

Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

20500 - Materials engineering

Project

—

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2021

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Materials

ISSN

1996-1944

e-ISSN

1996-1944

Volume of the periodical

14

Issue of the periodical within the volume

7

Country of publishing house

CH - SWITZERLAND

Number of pages

12

Pages from-to

1781

UT code for WoS article

000638689000001

EID of the result in the Scopus database

2-s2.0-85104080964