ELEMENTAL PARTITIONING CHARACTERISTICS AND STABILITY OF EQUILIBRIUM PHASES DURING 450-1200℃ IN T/P91 HEAT-RESISTANT STEEL

Acta Metall Sin

2008, Vol. 44

Issue (8): 897-900 DOI:

Research Articles

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ELEMENTAL PARTITIONING CHARACTERISTICS AND STABILITY OF EQUILIBRIUM PHASES DURING 450-1200℃ IN T/P91 HEAT-RESISTANT STEEL

Chun－guang Kuai;Zhifang Peng

武汉大学动力与机械学院材料工程系

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Chun－guang Kuai; Zhifang Peng. ELEMENTAL PARTITIONING CHARACTERISTICS AND STABILITY OF EQUILIBRIUM PHASES DURING 450-1200℃ IN T/P91 HEAT-RESISTANT STEEL. Acta Metall Sin, 2008, 44(8): 897-900 .

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Abstract Chemical compositions and amounts of equilibrium phases in T/P91 heat resistant steel in the temperature range of 450℃ ~ 1200℃ have been calculated by using thermodynamic software ‘Thermo-Calc’. Concept of elemental partitioning fraction is introduced to study the elemental partitioning characteristics of such main alloying elements as Cr, Mo, Fe, V, Nb, C and N, the stability, the constituents and the evolutional rule of the equilibrium phases at elevated temperatures. The results show that using the elemental partitioning characteristics with the change of temperatures the stability of the equilibrium phases can be easily revealed, and the sub-types of MX and the formation of M and X in MX, and the elemental evolution rule in MX type phases can be reasonably determined, and as well as the effect of carbon content in the matrix phase on the formation of MX phases can be helpfully understood, respectively.

Key words: Heat-Resistant Steel T/P91 Thermo-Calc thermodynamic calculation elemental partitioning fraction pha

Received: 10 October 2007

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