H.B. Chang
,
Z.G. Li
,
T. Y. Hsu
,
Z. Y. Xu
,
and X. Y. Ruan (Department of Metallurgical Engineering
,
Shanghai Technical College of Metallurgy
,
Shanghai 200233
,
China)(Department of Plasticity Technology
,
Shanghai Jiao Tong University
,
Shanghai 200030
,
China)(Department of Materials Science
,
Shanghai Jiao Tong University
,
Shanghai 200030
,
China)
金属学报(英文版)
Proeutectoid ferrite with carbon content xo precipitating from austenite in a multicomponent steel at temperature T is supposed to be equivalent to proeutectoid ferrite with the same carbon content precipitating from austenite in Fe-C binary system at temperature T'.is described as the temperature difference of proeutectiod ferrite formation, and can be calculated from the Fe-X diagrams and the equilibrium temperature A3. By introducing Tf and basing on the thermodynamic model for Fe-C binary alloy, the driving force for phase transformation from austenite to proeutectoid ferrite in multicomponent steels has been successfully calculated. Through the Johnson-Mehl equation and using the data hem known TTT diagrams, the relationship between the chemical composition and the intedecial edenly packeter as well as activation energy for proeutectoid ferrite formation can be calculated. The starting curves of proeutectoid ferritic transformation calculated in this way in some hypo-proeutectoid structural steels agree well with the erperimental data.
关键词:
proeutectoid ferrite formation temperature difference
,
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