
超声能场辅助激光熔化沉积TiC/Ti6Al4V复合材料的组织及性能
王建东, 赵子昂, 曾禹周, 薛宇, 窦文浩, 王大鹏, 管瑶
超声能场辅助激光熔化沉积TiC/Ti6Al4V复合材料的组织及性能
Microstructure and properties of TiC/Ti6Al4V composites by laser melting deposition assisted by ultrasonic energy field
采用同步超声能场辅助激光熔化沉积技术制备了TiC/Ti6Al4V复合材料,研究同步超声能场处理对TiC体积分数分别为5%和20%复合材料的显微组织及性能的影响。结果表明:沉积态复合材料中含有不均匀分布的未溶TiC颗粒以及原位TiC,其中5%TiC/Ti6Al4V(体积分数,下同)复合材料中含有较大尺寸的链条状共晶TiC,20%TiC/Ti6Al4V复合材料中含有较大尺寸的枝晶状初生TiC。施加同步超声能场处理后,复合材料中的未溶TiC颗粒分布均匀性得到改善;原位TiC增强相得到细化,链条状共晶TiC转变为颗粒状共晶TiC,枝晶状初生TiC尺寸减小。同步超声能场处理使5%TiC/Ti6Al4V和20%TiC/Ti6Al4V的显微硬度分别从406.5HV0.2和498.4HV0.2提高到414.2HV0.2和539.1HV0.2,磨损率分别从1.82×10-6 mm3·m-1·N-1和1.04×10-6 mm3·m-1·N-1降低到1.78×10-6 mm3·m-1·N-1和9.48×10-7 mm3·m-1·N-1,5%TiC/Ti6Al4V的抗拉强度从1075.23 MPa提高到1116.31 MPa,屈服强度从1021.51 MPa提高到1043.12 MPa,断裂应变从1.27%提高到1.45%,实现强度与塑性的同时提升。
TiC/Ti6Al4V composites are prepared by synchronous ultrasonic energy field-assisted laser melting deposition. The effects of synchronous ultrasonic energy field treatment on the microstructure and properties of the composites with TiC volume fraction of 5% and 20%, respectively, are studied. The results show that the as-built composites contain inhomogeneous distributed undissolved TiC particles and in-situ TiC particles, among which 5%TiC/Ti6Al4V (volume fraction,the same below)composites contain chain shaped eutectic TiC with larger size, and 20%TiC/Ti6Al4V composites contain dendritic primary TiC with larger size. With the application of synchronous ultrasonic energy field treatment, the distribution uniformity of undissolved TiC particles in the composite is improved. Moreover, the in-situ TiC reinforcing phase is refined, where the chain shaped eutectic TiC transforms to granular eutectic TiC, and the size of dendritic primary TiC decreases. Due to the effect of synchronous ultrasonic energy field treatment, the microhardness of 5%TiC/Ti6Al4V and 20%TiC/Ti6Al4V increases from 406.5HV0.2 and 498.4HV0.2 to 414.2HV0.2 and 539.1HV0.2, respectively. The wear rates reduce from 1.82 × 10-6 mm3·m-1·N-1 and 1.04×10-6 mm3·m-1·N-1 to 1.78×10-6 mm3·m-1·N-1 and 9.48×10-7 mm3·m-1·N-1, respectively. The tensile strength of the 5%TiC/Ti6Al4V increases from 1075.23 MPa to 1116.31 MPa, the yield strength increases from 1021.51 MPa to 1043.12 MPa, and the fracture strain increases from 1.27 % to 1.45 %, which realizes the simultaneous improvement of strength and plasticity.
激光熔化沉积 / 超声能场 / TiC/Ti6Al4V复合材料 / 显微组织 / 性能
laser melting deposition / ultrasonic energy field / TiC/Ti6Al4V composites / microstructure / property
TG146.2+3 / TB33
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