In the carburizing process, rare earth elements could promote the decomposition and absorption of medium and the diffusion of carbon atom.

在渗碳过程中，稀土元素对介质的分解，吸收和碳原子的扩散都起到了促进作用。

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Deformation bands are caused by plastic formation, and transformation bands generation mainly come from re-crystallization, phase transition and the diffusion of carbon.

形变带产生的机制为塑性变形，转变带产生的机制主要为再结晶、相变和元素扩散。

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The diffusion of carbon in hot working process of cladding sheet is analyzed based on diffusion theory and variations of carbon concentration in the high-speed steel matrix.

根据扩散理论和高速钢加热过程中基体的含碳量变化规律，对复合板材热加工过程中碳的迁移进行了讨论。

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The density of water molecules within the leaf is typically 60 times greater than the density of carbon dioxide in the air, and the diffusion rate of the water molecule is greater than that of the carbon-dioxide molecule.

WSJ: Harrison H. Schmitt and William Happer: In Defense of Carbon Dioxide