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| AN INVESTIGATION OF PHASE TRANSFORMATION IN ALUMINIDE COATING OF A NEW AUSTENITIC Fe—Mn—Al HEAT—RESISTING STEEL |
| Guan Hengrong Huang Youshan Lou Hanyi and Bai Linxiang (Institute of Metal Research; Chinese Academy of Sciences) |
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Abstract The microstructure and compositions of, and phase transformations in aluminide coating on a new Austenitic Fe-Mn-Al heat-resisting steel have been investigated in detail. Two zones were found in the coating. The outer zone is an ordered FeA1 solid solution, while the inner zone consists of FeAI, β-Mn, and V_4C_3. When this coating is oxidized in static air at 450—750℃ for 50—1000hrs, the processes of phase transformations are different in these zones. The sequence of the phase transformation in the outer zone is as follows. FeAl(→Fe_3Al)→α-Fe.→α-Fe+γ→γ, and that of the inner zone is: FeAl+β-Mn(→Fe_3Al+β-Mn)→α-Fe+β-Mn→α-Fe+β-Mn+γ→α-Fe+γ→γ. The phase transformation of the coating is closely related to the degradation of the coating. Formation of the aluminum deficient FeAl phase indicates the initiation of the coating degradation; the emergence of the γ phase means the stage of drastic degradation while the complete conversiott of the coating into γ marks the end of degradation.
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Received: 25 February 1982
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Cite this article:
Guan Hengrong Huang Youshan Lou Hanyi and Bai Linxiang (Institute of Metal Research; Chinese Academy of Sciences). AN INVESTIGATION OF PHASE TRANSFORMATION IN ALUMINIDE COATING OF A NEW AUSTENITIC Fe—Mn—Al HEAT—RESISTING STEEL. J Chin Soc Corr Pro, 1982, 2(1): 11-17.
URL:
https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y1982/V2/I1/11
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