P元素加入形式对铁基金刚石工具胎体组织性能的影响

Effects of different kinds of phosphorus-containing prealloyed powder on the microstructures and properties of Fe-based sintered matrix

以常用的CuP8,FeP24两种预合金粉作为研究对象,运用SEM,EDS,硬度和抗弯强度等研究分析手段,研究了以不同形式加入P元素对铁基金刚石工具胎体组织性能的影响.结果表明,烧结后胎体组织由α-Fe、含铁固溶体(Cu)、Fe3C化合物组成,加入FeP24的烧结胎体中还存在Fe2P和FeP化合物. P元素加入形式对胎体性能影响显著,向胎体中加入CuP8,P元素几乎全部脱离CuP8进入铁基体,相比于加入FeP24的胎体,P元素分布更均匀,胎体硬度、抗弯强度等性能指标均有提高. FeP24在热压过程中会产生微裂纹,这些微裂纹可能成为基体的裂纹源而降低胎体的抗弯强度.因此,选用CuP8预合金粉更有利于获得高性能铁基金刚石工具胎体.

In this paper, we took the pre-alloyed powder CuP8 and FeP24 as the object, by using SEM, EDS and analyzing the hardness and bending strength of the matrix, to explore how different kinds of phosphorus-containing prealloyed powder influence the microstructure and properties of Fe-based sintered matrix. The results have shown that both of the two kinds of matrix are mainly composed of α-Fe, Cubased solid solution and Fe3 C. However, matrix that has been added FeP24 also contains Fe2 P and FeP. Compared with matrix which contains FeP24, almost all the phosphorus in matrix which contains CuP8 is transferred from CuP8 to α-Fe and more evenly distributed, leading to a higher hardness and bending strength of the matrix. During the hot-pressing process, microcrack would appear on the FeP24 particle and may become the crack source of matrix, reducing the bending strength of the matrix. We thus came to the conclusion that CuP8 can improve the performance of Fe-based diamond tool.