等离子熔化沉积TiC增强Inconel 718基原位自生复合材料显微组织及高温耐磨性

Microstructure and High Temperature Wear Resistance of TiC/Inconel 718 Composites In-situ Synthesized by Plasma Melting Deposition Technique

摘要:

为改善镍基高温合金Inconel 718的高温耐磨性,利用同轴送粉等离子熔化沉积快速成形技术原位合成了TiC增强Inconel 718高温合金基高温耐磨复合材料。分析了复合材料的显微组织结构和原位自生过程,探讨了增强相TiC的含量对复合材料的显微硬度及高温干滑动摩擦磨损性能的影响规律,研究了复合材料的高温磨损机理。结果表明：复合材料组织细小致密,显微硬度随TiC增强相体积分数增加而相应提高；在高温干滑动磨损实验条件下,复合材料表现出优异的耐磨性。

Abstract:

In order to modify the wear resistance of Inconel 718 superalloy, TiC reinforced Inconel 718 superalloy based composites were in-situ synthesized by co-axial powder feeding plasma melting deposition technique. Microstructure and in-situ synthesized process of the composites was analysed. The effect of volume fraction of the TiC reinforcing phase on microhardness and high temperature dry sliding wear properties of composites was discussed. The high temperature wear mechanism of the composites was studied. Results show that the microstructure of composites is refined and dense, microhardness values are remarkably influenced by the volume fraction of the TiC primary phase. The higher the volume fraction of the TiC primary phase, the higher the microhardness values of the composites. The composites showed excellent wear resistance under high temperature dry sliding wear test conditions.