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材料工程  2011 

HP40Nb钢热浸镀Al-Si高温氧化行为及组织研究

, PP. 52-57

Keywords: HP40Nb,热浸镀铝,高温抗氧化性,α-Al2O3

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Abstract:

为提高高温抗氧化性能,对HP40Nb钢进行了热浸镀Al-10%(质量分数)Si,并进行不同温度扩散处理,研究了不同扩散处理试样在1000℃条件下的高温氧化行为,通过SEM,EDS和XRD分析了经不同扩散处理后的渗层在高温氧化过程中的组织结构变化.结果表明经800℃/4h扩散处理,渗层由内层(NiAl+Cr3Si)、中间层(Fe2Al5+少量Ni2Al3)和外层(FeAl3)组成;经900℃/4h扩散处理,渗层由内层(NiAl+Cr3Si)和外层(Fe2Al5+少量Ni2Al3)组成;经1000℃/4h扩散处理渗层由内层(α+Ni3Al,NiAl+Cr3Si)和外层(Fe2Al5+Ni2Al3)组成.不同扩散工艺处理试样经高温氧化360h后渗层均由外层(NiAl+Cr3Si)和内层(σ,α+Ni3Al)组成;经1000℃/4h扩散处理试样高温氧化性能最好,其氧化增重速率仅为未浸镀试样的13%.氧化过程中,渗层表面经扩散处理生成的α-Al2O3能显著提高钢的高温抗氧化性能.扩散温度越高,α-Al2O3越完整,致密抗高温氧化性能越好;渗层中σ相能阻碍铝原子的内扩散,从而保证了氧化过程中渗层表面生成α-Al2O3所需铝含量,除表面的α-Al2O3外,渗层中的NiAl,Cr3Si相也起到了抗氧化作用.

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