利用铬与α-Fe无限互溶,含铬的共晶碳化物与二次碳化物形成机理不同,首先在Q235钢和45钢表面渗入合金元素铬,形成高铬合金扩散层,表面含铬量达到40%(质量分数,下同)以上,并在一定范围内使表面合金层铬含量呈梯度分布.利用铬是碳化物形成元素,进行等离子渗碳,因为碳化物形成温度低,在高铬合金层中固体形核长大,所形成的含铬碳化物弥散、细小、均匀.虽表面含碳量达2.8%以上,但是没有共晶碳化物.经淬火及回火处理,表面硬度在HV1800以上.磨损实验表明:与对磨淬火GCr15钢相比,耐磨性能提高7倍以上.

At first,plasma chromizing was engaged in cheaper material Q235 and 45 steel surface and the high chromized layer content were formed on the surface of these steels.The chromized layer contained more than 40%(mass fraction) of chromium. After plasma carburizing,the carbon content would be more than 2.8%(mass fraction),the carbides were very fine and distributed uniformly.These was no eutectic carbides in this kind of layer.The hardness on the surface after such compound strengthening was more than HV1800.Compared to the steel GCr15,the wear-resistance was increased about 7-times.