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首页> 外文期刊>Applied Surface Science >EBSD study of crystallographic identification of Fe-Al-Si intermetallic phases in Al-Si coating on Cr-Mo steel
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EBSD study of crystallographic identification of Fe-Al-Si intermetallic phases in Al-Si coating on Cr-Mo steel

机译：EBSD对Cr-Mo钢上Al-Si涂层中Fe-Al-Si金属间相的晶体学鉴定的研究

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摘要

5Cr-0.5Mo steel was coated by hot-dipping in a molten Al-10wt.% Si bath at 700℃ for 10, 60,120 or 180 s. The identification of the phases in the Fe-Al-Si intermetallic phases formed in the aluminide layers during hot-dipping was carried out by using a combination of scanning electron microscope (SEM) with energy dispersive X-ray spectroscopy (EDS), X-ray diffraction (XRD) and electron backscatter diffraction (EBSD). The EDS results show a T_(5(H))-Al_7Fe_2Si phase, which exhibited 2 distinct morphologies, small particles widely dispersed and a continuous layer. Also revealed by EDS were τ_6-Al_4FeSi and τ_4-Al_3FeSi_2 phases, which showed plate-shaped morphology, in an Al-Si topcoat. However, the XRD results show the intermetallic phases in the aluminide layer were composed of outer cubic τ_(5(C))-Al_7(Fe,Cr)_2Si and inner hexagonal τ_(5(H))-Al_7Fe_2Si. EBSPs and mapping functions in EBSD helped to clarify the confused phase identifications yielded by EDS and XRD. In this way, the small intermetallic particles and the continuous intermetallic layer were identified as cubic τ(5(C))-Al7(Fe,Cr)_2Si and hexagonal τ_(5(H))-Al_7Fe_2Si, respectively, and the plate-shaped intermetallic phase was identified as monoclinic τ_6-Al_4FeSi and tetragonal T4-Al_3FeSi_2 with the same metallographic morphology. EBSD proved to be a very effective technique for local phase identification of aluminide layers with complicated multiphase morphologies.
机译：通过在700℃的Al-10wt。％Si熔池中热浸10、60,120或180 s来涂覆5Cr-0.5Mo钢。通过使用扫描电子显微镜（SEM）和能量色散X射线光谱（EDS），X-射线相结合的方法来鉴定在热浸过程中铝化物层中形成的Fe-Al-Si金属间相中的相射线衍射（XRD）和电子背散射衍射（EBSD）。 EDS结果表明，T_（5（H））-Al_7Fe_2Si相具有2种不同的形貌，小颗粒广泛分散，并且连续。 EDS还显示出在Al-Si面漆中的τ_6-Al_4FeSi和τ_4-Al_3FeSi_2相显示出板状形态。然而，XRD结果表明，铝化物层中的金属间相由外立方τ_（5（C））-Al_7（Fe，Cr）_2Si和内六角形τ_（5（H））-Al_7Fe_2Si组成。 EBSD中的EBSP和映射功能有助于阐明EDS和XRD产生的混淆相。这样，金属间小颗粒和连续金属间层分别被确定为立方τ（5（C））-Al7（Fe，Cr）_2Si和六角形τ_（5（H））-Al_7Fe_2Si，而板-形状相同的金属间相被鉴定为具有相同金相形态的单斜晶系τ_6-Al_4FeSi和四方晶T4-Al_3FeSi_2。 EBSD被证明是一种用于识别具有复杂多相形态的铝化物层局部相的非常有效的技术。

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