中文摘要：

为提高涂层质量和性能,以钛粉或钛铁粉、铬粉、铁粉和碳的前驱体（蔗糖）为原料,在前期制备等离子熔敷Fe-Cr-C涂层基础上添加一定量的Ti,通过前驱体碳化复合技术制备了Fe-Cr-C-Ti等离子熔敷复合粉末,并采用等离子熔敷技术在Q235钢表面原位合成了Fe-Cr-C-Ti涂层。采用SEM对添加不同粉末成分（不同C、Ti、Cr含量）时制备出的涂层的显微组织结构进行了分析。结果表明：随着C含量的增加,涂层中（Cr,Fe）7C3共晶相逐渐增加,奥氏体相相对减少,Ti C颗粒形态从等轴状向树枝状转变。随着Ti含量的增加,Ti C颗粒尺寸逐渐增加,形态由等轴状向树团聚和枝状状转变,（Cr,Fe）7C3共晶逐渐减少,奥氏体相逐渐增加。随着Cr含量的增加,（Cr,Fe）7C3共晶相逐渐增加,奥氏体相逐渐减少,Ti C颗粒形态由树枝状向等轴状转变。

英文摘要：

In order to improve the quality and performance of the coatings,in the early stage of preparing plasma clad Fe-Cr-C coating basis to add a certain amount of Ti. And Fe-Cr-C-Ti composite powder was prepared with using the mixture of ferrotitanium,chromium,iron powders and precursor sucrose as raw materials by precursor carbonizationcomposition process. In situ synthesized Fe-Cr-C-Ti coatings were fabricated on substrate of Q235 steel by plasma cladding process using Fe-Cr-C-Ti composite powder. Microstructures of the coating added different powder composition（ C,Ti,Cr contents in different） were analyzed by scanning electron microscope（ SEM）. The results showed that： with the increase of C content,（ Cr,Fe）7C3eutectic phase in the coating increased and austenite phase decreased gradually.Ti C particle morphology change from equiaxed to dendrite. With the increase of Ti content,the size of Ti C particles increased,their shapes changed from equiaxed to dendrite and reunion,and（ Cr,Fe）7C3eutectic phase decreased andaustenite phase increased gradually. With the increase of Cr content,（ Cr,Fe）7C3eutectic phase increased and austenite phase decreased gradually,the morphology of Ti C particles by transition from dendrite to equiaxed.