对一种新型奥氏体Fe—Mn—Al耐热钢铝化物涂层的显微结构、组成、相变进行了详细地研究。渗层共分两层,外层为有序超结构固溶体FeAl,内层由FeAl、β-Mn,V_4C_3组成。当这种涂层在静态空气下,在450—750℃温度范围内氧化50—1000小时时,这两层经历着不同的相变规律。外层是:FeAl(→Fe_3Al)→α-Fe→α-Fe+γ→γ。内层是:FeAl+β-Mn(→Fe_3Al+β-Mn)→α-Fe+β-Mn→α-Fe+β-Mn+γ→α-Fe+γ→γ。涂层的相变和涂层的退化紧密相连。贫Al的FeAl相的形成,意味着退化开始。γ的出现,称之促使退化加剧。涂层完全转变成γ,退化即告终。
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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