MODIFICATION OF ZENER'S TWO--PARAMETER IN THE SUPERELEMENT MODEL FOR Fe--Σ Xi--C ALLOY SYSTEMS

Acta Metall Sin

2009, Vol. 45

Issue (3): 331-337 DOI:

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MODIFICATION OF ZENER'S TWO--PARAMETER IN THE SUPERELEMENT MODEL FOR Fe--Σ X_i--C ALLOY SYSTEMS

PENG Ningqi^1;2;TANG Guangbo²;LIU Zhengdong²;WU Xiuyue^1;2

1 Key Laboratory of Advanced Materials of Yunnan Province; Kunming University of Science and Technology; Kunming 650093
2 Institute for Structural Materials; Central Iron and Steel Research Institute; Beijing 100081

Cite this article:

PENG Ningqi TANG Guangbo LIU Zhengdong WU Xiuyue. MODIFICATION OF ZENER'S TWO--PARAMETER IN THE SUPERELEMENT MODEL FOR Fe--Σ X_i--C ALLOY SYSTEMS. Acta Metall Sin, 2009, 45(3): 331-337.

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Abstract

On the basis of experimental value of A_e3, a modified superelement model has been developed by the modification of Zener's two--parameter for substitutional elements, such as Si, Mn, Ni, Co, Mo, Al, Cu and Cr, according to Aaronson's method of superelement model, in which the interactions between alloying elements have been taken into account. The prediction accuracy of the modified model has been greatly improved in comparison with the existing superelement models. The standard deviations between the A_e3 value calculated by the modified superelement model and measured A_e3, and Thermo--Calc calculated A_e3, are 10.8 and 2.35 ℃, respectively. The standard deviation between the experimental A_e1 and the A_e1 calculated by the superelement model with new Zener's two--parameter is 6.8 ℃. In accordance with the thermodynamics calculation approach of the transformation from austenite to martensite, the martensite start temperature, M_s, has also been calculated with the modified parameters, and the standard deviation between the experimental and calculated M_s values is 25.3 ℃.

Key words: phase transformation thermodynamics superelement model equilibrium transformation temperature

Received: 18 August 2008

ZTFLH:

TG111.5

Fund:

Supported by Project of Scientific and Technical Supporting Program of China during the 11th Five--Year Plan (Nos.{\footnotesize\it 2006BAE03A08} and 2006BAE03A04)

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https://www.ams.org.cn/EN/ OR https://www.ams.org.cn/EN/Y2009/V45/I3/331

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