【作者】 高义民； 张国赏； 邢建东；

【Author】 GAO Yi-min, ZHANG Guoshang, XING Jian-dong School of Material Science and Engineering, Xi’an Jiaotong University, Xi’an Shaanxi 710049,

【机构】 西安交通大学材料科学与工程学院；

【摘要】 为了克服高锰钢(Mnl3)在中低应力条件下冲击磨损性能差的问题,利用离心铸造法制备了WCp/Mn13表面复合材料。通过显微形貌、能谱、X射线衍射,研究了WC陶瓷颗粒与Mnl3基体的界面结构:以不同粒径的WC颗粒分别制备了复合材料,并以高锰钢为对比材料进行了冲击磨损试验。试验结果表明: WC与基体形成了一定厚度的扩散层．扩散层中有细小复合碳化物析出,WC与基体结合为冶金结合。小颗粒WC增强的复合材料抗冲击磨损性能优于高锰钢: 而大颗粒WC增强的复合材枓在冲击载荷较小时,抗冲击磨损性能优于高锰钢,冲击载荷较大时,抗冲击磨攒性能不如高锰钢。因此,选择大小合适的WC颗粒增强高锰钢用于抗冲击磨损工况具有较强的应用价值。更多还原

【Abstract】 To improve the impact wear resistance of high manganese steel(Mn13), a new kind of surface composite WCp/Mn13 was fabricated by means of centrifugal casting. The interracial structure between WC and matrix was analyzed by SEM, EDX and XRD. The impact wear tests of three kinds of composites in which the WC paniculate sizes are different were carried out under different impact loads. For comparison, the wear tests of Mn13 were also carried out under the same conditions. The results show that WC particles are partially dissolved into the liquid steel during centrifugal casting, and many fine particles precipitate out around former WC particles during subsequent cooling. So the interface between WC particles and the matrix is a perfect metallurgical combination. The composites reinforced with smaller WC particles show better impact wear resistance than that of Mn13. The composites reinforced with larger WC particles show better impact wear resistance than that of Mnl3 when the impact load is lower and shows poorer impact wear resistance when the impact load is higher. So it is very important to choose suitable WC particles as reinforcement to make Mn 13 matrix composites according to service conditions.更多还原