(1. 湖南工程學院 工程訓練中心，湘潭 411101；
2. 湖南工程學院 機械工程學院，湘潭 411101)
摘 要: 研究TiC顆粒與鋼基混合粉在高能球磨過程中的顯微組織與性能，分析在球磨過程中，粉末顆粒的形貌變化與粒度分布規(guī)律，明晰球磨時間對燒結(jié)合金致密度、顯微組織和力學性能的影響。結(jié)果表明：當球磨時間從0 h增加到30 h時，粉末顆粒發(fā)生變形破碎，粉末粒度快速降低；當球磨時間進一步增加到40 h時，粉末顆粒間的焊合破碎作用達到平衡，此時，粉末粒度變化趨于平緩，粉末形貌由最初的球形大顆粒變化為細小的層片狀。當球磨時間繼續(xù)增加時，粉末形貌不再有明顯變化。燒結(jié)合金的致密度、顯微組織和力學性能也呈現(xiàn)出相似的變化規(guī)律。復合材料的最佳球磨時間為40 h。
關(guān)鍵字: 高能球磨；TiC顆粒；高速鋼；復合材料
（1. Engineering Training Center, Hunan Institute of Engineering, Xiangtan 411101, China;
2. School of Mechanical Engineering, Hunan Institute of Engineering, Xiangtan 411101, China）
Abstract:The microstructure and properties of TiC particles mixed with high speed steel powders during high energy ball milling were systematically investigated. The transformation of the powder particle morphology and the distribution of particle size changing with the milling time were also analyzed. In addition, the effects of ball milling time on the density, the structure and mechanical properties of sintered composites were revealed. The results indicate that, when the ball milling time increases from 0 h to 30 h, the deformation and crush of powders presented, resulting in the rapid decrease of the powder particle size. With increasing the ball milling time to 40 h, the welded crushing effect of the particles reaches the balance, while the particle size remains unchanged and the original big spherical particles are changed into the tiny layer powders. When further increasing the ball milling time, the morphology of powders cannot change significantly. The density, structure and mechanical properties of the sintered alloy have the similar trend. Therefore, the optimal ball milling time of the composite material is 40 h.
Key words: high energy ball-mill; TiC particles; high speed steel; composite material
