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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, composition and phase transition of a new austenitic Fe-Mn-Al heat-resistant steel aluminide coating were studied in detail. The infiltration layer is divided into two layers, the outer layer is the ordered super structure solid solution FeAl, the inner layer is composed of FeAl, β-Mn and V_4C_3. When this coating is oxidized in static air at 450-750 ° C for 50-1000 hours, the two layers undergo different phase transitions. The outer layer is: FeAl (→ Fe_3Al) → α-Fe → α-Fe + γ → γ. The inner layer is: FeAl + β-Mn (→ Fe_3Al + β-Mn) → α-Fe + β-Mn → α-Fe + β-Mn + γ → α-Fe + γ → γ. The phase transition of the coating is closely linked to the degradation of the coating. The formation of Al-depleted FeAl phases means the onset of degeneration. The emergence of γ, called it to promote deterioration degeneration. The coating is completely converted to γ and the degradation ends.