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首页> 外文期刊>Journal of Iron and Steel Research International >Effect of Rare Earth on Void Band of Diffusion Layer and Properties of Aluminized Steel
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Effect of Rare Earth on Void Band of Diffusion Layer and Properties of Aluminized Steel

机译：稀土对扩散层空隙带和渗铝钢性能的影响

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摘要

The effects of the addition of rare earth (RE) elements on the void band in the diffusion layer, and the resistances to both oxidation and spalling of aluminized steel were investigated through high temperature oxidation and spalling tests. The results showed that RE had significant effects on the void band in the diffusion layer and the properties of aluminized steel. After diffusion treatment, a considerable number of the voids between the middle layer and transitional layer of pure aluminized coating, aggregated into wavy Tine-shaped void bands parallel to the outer surface. For the RE-added aluminized coating, only a few voids aggregated into intermittent block shapes. During high temperature oxidation at 800 deg C for 200 h, the wavy void band of pure aluminized coating aggregated further into a linear crack parallel to the outer surface, and the internal oxidation occurred within them; the open cracks perpendicular to the surface penetrated through the diffusion layer. For the RE-added aluminized coating, only a few voids aggregated into intermittent meniscus shapes. During cyclic spalling tests, the peeling, spallation, and pulverulent cracking occurred along the void band in the diffusion layer of pure aluminized coating, but only a little spallation occurred in the diffusion layer of the RE-added aluminized coating, in which cracks perpendicular to the surface were much smaller than those of pure aluminized coating and did not penetrate through the diffusion layer. It is evident that RE addition can restrain the formation and aggregation of voids and subsequently improve the resistances to oxidation and spalling. The mechanism of the RE effect on the void band in the diffusion layer is also discussed.
机译：通过高温氧化和剥落试验研究了添加稀土元素对扩散层空隙带的影响，以及渗铝钢的抗氧化和剥落性能。结果表明，稀土元素对扩散层中的空隙带和渗铝钢的性能有显着影响。经过扩散处理后，纯铝镀层的中间层和过渡层之间的大量空隙聚集成平行于外表面的波浪形的Tine形空隙带。对于添加稀土的镀铝涂层，只有少数空隙聚集成断续的块状。在800摄氏度的高温氧化200小时期间，纯铝镀层的波浪状空隙带进一步聚集成平行于外表面的线性裂纹，内部发生了氧化。垂直于表面的开放裂缝穿透了扩散层。对于添加稀土的镀铝涂层，只有少数空隙聚集成间歇的弯月面形状。在周期性剥落测试中，纯铝镀层扩散层中的空隙带沿剥落，剥落和粉状裂纹发生，而添加稀土的铝镀层的扩散层中仅出现少量剥落，其中裂纹垂直于其表面比纯铝涂层的表面小得多，并且没有穿透扩散层。显然，添加稀土元素可以抑制空隙的形成和聚集，从而提高抗氧化性和抗剥落性。还讨论了RE对扩散层中空带的作用机理。

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