TiC增强高锰钢基复合材料的组织与磨料磨损性能

Microstructure and Abrasive Wear Properties of TiC-Reinforced Hadfield Steel Matrix Composites

采用凝固析出方法制备了不同体积分数TiC增强的高锰钢基复合材料,系统研究了复合材料的显微组织和磨料磨损性能。热处理后,复合材料由奥氏体和TiC两相组成,TiC颗粒均匀分布在高锰钢基体中,颗粒与基体界面清洁。磨料磨损实验表明,TiC颗粒的引入提高了复合材料耐磨性能。然而,复合材料的耐磨损性能随着TiC体积分数的增加而降低。研究结果表明,随着TiC体积分数的提高,陶瓷颗粒尺寸增大且部分形成团簇,陶瓷颗粒在磨损过程中发生破碎从而提高磨损率。

High manganese Hadfield steel is the conventional wear-resistant steel.In order to meet the requirements of complex working conditions,Hadfield steel matrix composites(SMCs)with various volume fractions of Ti C were designed and fabricated by an in-situ solidification method.The microstructure and abrasive wear properties of these composites were examined.After heat treatment,the composites consist of austenite and TiC phases.TiC particles are uniformly distributed in the matrix,and the interface between the particles and the matrix is clean.Results show that the wear resistance of the composites can be improved by the introduction of TiC particles.However,with the increase of the TiC volume fraction,the wear resistance decreases slightly.We find that the particles increase in size and then their segregations are formed with the increase of the TiC volume fraction.The increased wear rate with the increase of the TiC volume fraction is caused by the fracture of large particles.