Moreover, re elements can fine the structure of the layer, improve precipitating carbonous chromium nitride formed and increase the hardness of the layer.
而且稀土元素显著地细化渗层组织，促进氮碳化合物弥散细小析出，提高渗层硬度。
Moreover, re elements can fine the structure of the layer, improve precipitating carbonous chromium nitride formed and increase the hardness of the layer.
而且稀土元素显著地细化渗层组织，促进氮碳化合物弥散细小析出，提高渗层硬度。
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