摘要
用原位烧结法制备了不同V与Ti原子比(0,0.2,0.4,0.8)的(Ti,V)C35CrMo钢结硬质合金。研究了V含量对钢结硬质合金组织及力学性能的影响。用SEM观察试样的微观组织特征、断口形貌和磨损形貌。结果表明:V含量影响钢结硬质合金硬质相的形态、大小、体积分数,进而影响合金的力学性能。V与Ti的原子比为0.2时硬质相最小;随着V含量增加,硬质相趋于圆整、并增大。断口形貌特征为硬质相解理、基体准解理及韧窝。基体形变磨损和硬质相脱落是钢结硬质合金的磨料磨损机理。V与Ti的原子比为0.2时抗弯强度及耐磨性最高。
（ Ti,V） C35CrMo steel bonded carbide with different V/Ti atomic ratio （ 0,0. 2,0.4,0. 8 ） were prepared by in situ sintering and the effect of vanadium content on the microstructure and mechanical property of the alloys were analyzed. In order to characterize the microstructure, fracture morphology and the wear behaviors, SEM have been utilized. The results show that the vanadium content plays an important role in affecting the morphology, size, volume fraction of （Ti,V） C reinforcements particles and the mechanical properties of the alloys. The size of reinforcement particles of the composites with 0. 2 V/Ti atomic ratio is the finest. With the increase of vanadium content, the reinforcement particle size increases gradually and the morphology of the particles changes to be round. The main fractographic appearances are （Ti,V）C cleavage, quasi-cleavage of matrix , dimples. The carbide peeling and the plastic deformation wear of matrix is the main wear mechanism. The bending strength and wear resistance of （Ti,V） C35CrMo steel bonded carbide with 0. 2 V/Ti atomic ratio reach the maximum.
出处
《粉末冶金技术》
CAS
CSCD
北大核心
2009年第5期336-340,共5页
Powder Metallurgy Technology
基金
西南科技大学青年基金资助项目(08zx3145)
