工业纯铁渗硼表面层FeB相的穆斯堡尔效应研究

Study on Mossbauer effects on FeB phase in borided surface layers on pure iron

研究了粉末法在８８０℃下保温２ｈ和９３０℃下保温５ｈ进行渗硼的工业纯铁．通过穆斯堡尔谱学方法、金相方法和ＸＲＤ方法观察了渗硼表面层的显微组织特征，确定了渗硼表面层的相及其结构．渗硼表面层是由ＦｅＢ和 Ｆｅ２Ｂ双相构成的，其中ＦｅＢ相主要具有两种不同的晶位分布．在室温下，ＦｅＢ相的穆斯堡尔谱是由两套铁磁性亚谱构成的，它们的内磁场大小分别为１１６ｋＯｅ和 ９３ｋＯｅ．

The pure iron samples bornized at 880 ℃ for 2h and at 930℃ for 5 h in crystalline boron powder have been studied. Mossbauer measurements, supported by optical metallography and by X-ray diffraction analysis, enable the surface phase and their structure to be defined. FeB and Fe2B phases are deposited on the borided surface layers, and FeB phase is mainly composed of the two crystal types. The room temperature Mossbauer spectrum of FeB is formed by two ferromagnetic sextet superposition, the magnitude of their internal magnetic field is individually 116 kOe and 93 kOe. The microstructure of the borided surface layers is observed.