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为了研究渗碳对2205双相不锈钢的显微组织、化学成分及性能的影响,对该钢进行了高温渗碳和固溶时效处理。结果表明:渗层由扩大的奥氏体和小块状铁素体组成。渗碳后奥氏体与铁素体内部有错综杂乱的位错缺陷,铁素体晶内有微量规则的析出相。再经过固溶时效处理,晶界处与晶内均有不同形状的碳化物析出。渗层的C、Cr含量升高,Fe含量降低,且渗层铁素体中的Cr、Mo含量要高于心部铁素体。由于渗层的奥氏体固溶了较多的碳元素,渗层的硬度高于心部组织,硬度从表面到心部有缓慢的过渡;渗碳前后耐蚀性未发生明显变化。
In order to study the effect of carburizing on the microstructure, chemical composition and properties of 2205 duplex stainless steel, the steel was subjected to high temperature carburizing and solution aging treatment. The results show that the infiltration layer consists of expanded austenite and small massive ferrite. After carburizing, the austenite and ferrite have disordered dislocation defects inside. There are a few regular precipitation phases in the ferrite crystal. Then after solution treatment, the grain boundary and the crystal have different shapes of carbide precipitation. The content of C and Cr increased and the content of Fe decreased while the content of Cr and Mo in the infiltrated ferrite was higher than that of the heart ferrite. Due to the infiltration layer of austenite solid solution of more carbon, the hardness of the diffusion layer is higher than the heart tissue, hardness from the surface to the heart slowly transition; before and after carburizing corrosion resistance did not change significantly.