TiC添加量对激光增材制造MC碳化物增强Inconel625复合材料组织及性能的影响  

Effect of TiC Addition on Microstructures and Properties of MC Carbide Reinforced Inconel625 composites by Laser Additive Manufacturing

作　　者：王舒 程序[1,2] 田象军 张纪奎[1] Wang Shu;Cheng Xu;Tian Xiangjun;Zhang Jikui(National Engineering Laboratory of Additive Manufacturing for Large Metallic Components, Beihang Beijing 100191, China;School of Materials Science and Engineering, Beihang University, Beijing 100191, China)

机构地区：[1]北京航空航天大学大型金属构件增材制造国家工程实验室,北京100191 [2]北京航空航天大学材料科学与工程学院,北京100191

出　　处：《中国激光》2018年第6期50-57,共8页Chinese Journal of Lasers

基　　金：国家高技术研究发展计划(2014AA041701);辽宁省自然科学基金(U1508231)

摘　　要：利用激光增材制造技术制备了MC碳化物增强Inconel625复合材料,研究了TiC添加量对复合材料显微组织、显微硬度和摩擦磨损性能的影响。结果表明,添加TiC的复合材料的显微组织由枝晶状γ基体与枝晶间呈弥散分布的增强体组成。随着TiC添加量的增大,复合材料中一次枝晶间距逐渐减小,而枝晶间碳化物含量和显微硬度逐渐增大,抗磨损性能比Inconel625合金提高80%以上。当TiC的质量分数为1%时,复合材料的屈服强度和抗拉强度比Inconel625合金分别提高了21.9%和27.5%,但延伸率减小。The MC carbide reinforced Inconel625 composites are prepared by the laser additive manufacturing technology,and the effects of TiC addition mass on the microstructures,micro-hardness and wear properties of the composites are investigated.The results show that the microstructure of composite with the addition of TiC is composed of dendriticγmatrix and interdendritic reinforcements with a dispersive distribution.With the increase of TiC addition,the primary dendritic spacing of the composites decreases,while the content of MC carbide as well as the micro-hardness increases gradually.The wear resistance properties of all the composites are improved by over80%.When the TiC has a mass fraction of 1%,the yield strength and tensile strength of the composites are increased by 21.9% and 27.5%,respectively,but their elongation is reduced.

关 键 词：激光技术 激光增材制造 镍基复合材料 原位生成 MC碳化物 

分 类 号：TG146.1[一般工业技术—材料科学与工程]