利用SAXD和SEM(EDAx)研究了Haynes 230合金在1100℃的恒温氧化行为.结果表明:氧化膜主要由Cr2O3和(Ni、Mn、Cr)3O4组成.随着氧化时间的延长,形成了多层氧化膜.外部的(Ni、Mn、Cr)3O4氧化膜可以阻止内部Cr2O3氧化层的挥发.氧化增重近似遵循抛物线规律.由于Cr和Mn的快速向外扩散,靠近氧化膜的基体化学成分发生变化,从而导致合金表层组织恶化,形成沿晶界分布的富Al的内氧化物、孔洞以及无碳化物区域.
The isothermal oxidation behavior of Haynes 230 alloy(Ni-Cr-W-Mo alloy)in air at 1100℃was investigated by means of SAXD and SEM(EDAX).The predominant phase in the oxide scales were Cr2O3 and(Ni.Mn,Cr)3O4.Multilaver was observed with increasing of oxidation time.The outer(Ni,Mn,Cr)3O4 scale may reduce the volatilization of inner Cr2O3 scale and its oxidation behavior almost followed parabolic law.Due to preferential diffusion of manganese and chromium.alloy composition beneath the oxide scale changed,which led to subsurface degradation such as intergranular oxidation,void formation,and no carbide zone formation
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