摘要
TiC particle reinforced 420 stainless steel matrix composites were fabricated, and the microstructure, tensile properties and wear resistance of the composites were studied. The experimental results indicate that the distribution of TiC particles with size of 5 to 10 μm in diameter is uniform if the volume fraction of TiC is lower than 6%. However, slight agglomeration can be observed when the TiC content exceeds 6%. With the increase of TiC content the tensile and yield strength of the composites prepared increases and reaches the maximum when the volume fraction of TiC increases to 5%. Further increase of TiC content causes reductions of yield and tensile strength. The ductility of the composites shows a monotone decrease with the increase of TiC addition. The introduction of TiC into 420 stainless steel results in significant improvement on wear resistance, which reaches a steady level when the volume fraction of TiC increases to 11% and does not show obvious variation if the TiC content is further increased.
用原位合成方法制备了TiC增强420不锈钢基复合材料,并研究了复合材料的显微组织、力学性能和抗磨损性能.实验结果表明,当复合材料中TiC颗粒体积分数低于6％时,材料中TiC颗粒分布均匀,颗粒的尺寸在5-10μm左右;但颗粒体积分数大于6％后,显微组织中出现TiC颗粒的轻微偏聚.随着TiC体积分数的增加,材料的抗拉强度和屈服强度先是增高,当TiC体积分数达到5％时,强度达最大值.此后增加TiC体积分数会导致强度的下降.复合材料的塑性随TiC体积分数的增加呈单调下降的趋势.TiC颗粒的引入使材料的抗磨损性能得到显著改善,但当TiC体积分数达到11％时,抗磨损性能接近一个稳定的水平.继续增加TiC含量,材料的抗磨损性能不再发生明显变化.
