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首页> 外文期刊>Applied Surface Science >Study of microstructure and phase evolution of hot-dipped aluminide mild steel during high-temperature diffusion using electron backscatter diffraction
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Study of microstructure and phase evolution of hot-dipped aluminide mild steel during high-temperature diffusion using electron backscatter diffraction

机译：用电子背散射衍射研究热浸镀铝化物低碳钢在高温扩散过程中的组织和相变

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摘要

Mild steel was coated by hot-dipping into a molten aluminum bath. The microstructure and phase evolution in the aluminide layer during diffusion at 750℃ in static air were analyzed by electron backscatter diffraction (EBSD). The results showed that the aluminide layer of the as-coated specimen consisted of an outer aluminum topcoat, minor FeAb and major Fe_2Al_5, respectively. Also, Fe_2Al_5 possessed a tongue-like morphology, which caused corresponding serration-like morphology in the steel substrate. A portion of the peaks of serration-like substrate were isolated, after short exposure at 750℃, and accompanied by the formation of voids, which continued to appear with further exposure at 750 ℃. As the aluminum topcoat was consumed, FeAl_3 phase disappeared and left an aluminide layer of Fe_2Al_5 phase. After 60 min of exposure, FeAl_2 and FeAl phases formed at the interface between Fe_2Al_5 and the steel substrate. With increasing exposure time, the voids condensed and the serration-like morphology disappeared, while FeAl_2 and FeAl phases kept growing. After prolonged exposure, the aluminide layer was composed of and FeAl and possessed a flat interface between FeAl and steel substrate.
机译：通过热浸入熔融铝浴中来涂覆低碳钢。通过电子背散射衍射（EBSD）分析了在750℃静态空气中扩散过程中铝化物层的微观结构和相演变。结果表明，涂​​层样品的铝化物层分别由外层铝面涂层，次要FeAb和主要Fe_2Al_5组成。另外，Fe_2Al_5具有舌状形态，从而在钢基材中引起相应的锯齿状形态。在750℃短时间暴露后，分离出部分锯齿状底物峰，并伴有空隙的形成，在750℃进一步暴露后，这些空隙继续出现。随着铝面涂层的消耗，FeAl_3相消失并留下Fe_2Al_5相的铝化物层。暴露60分钟后，FeAl_2和FeAl相在Fe_2Al_5与钢基底之间的界面处形成。随着暴露时间的增加，空隙凝结，锯齿状形态消失，而FeAl_2和FeAl相则保持增长。长时间暴露后，铝化物层由FeAl组成，在FeAl和钢基材之间具有平坦的界面。

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