渗硼的渗层组织和性能研究

Research on Mechanism and Property of Boronizing Layer of Boronizing

渗硼过程中,随着硼浓度的增加,渗硼层的组织由内向外依次为芯部基体、过渡层和硼化物层。如碳钢的低温硼氮共渗层呈梳齿状,表层由FeB、Fe2B双相组成,内层为Fe2B单相。合金钢低温硼氮共渗层的针状变得平坦,渗层的相组成较为复杂,Cr12钢低温硼氮共渗表层由Fe2B、FeB、Fe4N组成,内层相由FeB、Fe2B、Fe3(C,B)、(Fe,Cr)2B、Fe4N、Fe3C等组成,过渡区形成Fe3(C,B)、Fe4N相及Cr的碳化物,有效地强化了对硼化物层的支撑作用。渗硼层具有良好的耐磨性、耐腐蚀性。

During the boronizing process, boronizing mechanism consists of the core part, transition layer and boronizing layer with the increasing of concentration of boron. Carbonitriding layer at low temperature of Carbon steel shows comb type. The surface is composed of FeB and Fe2B. The inner layer is Fe2B. Carbonitriding layer of alloy at low temperature becomes flat. The carbonitriding layer is relatively complex. Cr12 steel low-temperatured infiltration surface consists of Fe2B, FeB and Fe4N. The inner layer is composed of FeB, Fe2B, Fe3 （C,B）, （Fe,Cr）2B, Fe4N and Fe3C. Fe3 （C, B）, Fe4 N phase and Cr carbon compose the transition layer. The layers effectively strengthen the support of boron carbide layer. The boronizing layer has higher wear resistance and corosion resistance.