不锈钢纤维网对热压铁基预合金胎体抗冲击韧性的影响

Effect of stainless steel fiber mesh on impact toughness of hot-pressed iron-based prealloyed carcass

摘要:

针对孕镶金刚石钻头在孔底钻进时受到各种冲击力而导致胎体出现裂纹甚至断裂的问题，提出了应用不锈钢纤维网提高胎体抗冲击韧性的方法。通过控制纤维网的摆放位置、目数和层数3个变量，测试了不同组合变量下的胎体抗冲击韧性。通过试验得到：（1）不锈钢纤维网能有效提高胎体的抗冲击韧性，而且X轴位置效果更好；（2）当纤维网的目数相同时，胎体抗冲击韧性随纤维网层数的增加而减小；（3）在纤维网层数相同的情况下，随着纤维网目数的增加，胎体抗冲击韧性呈现先增大后减小的趋势。当添加30目单层纤维网时，胎体的抗冲击韧性达到最大值。通过观察冲击断口、分析胎体断裂机理，解释了出现这种规律的原因，并提出了进一步优化胎体抗冲击韧性的方法。

Abstract:

Aiming at the problem of low impact toughness of the impregnated diamond bit matrix, a method of adding stainless steel fiber net to the carcass to improve the impact toughness of the matrix is proposed. The impact toughness of matrix was tested at different combinations of the three variables: the placement, mesh and number of layers of the fiber net. It was obtained through experiments: (1)stainless steel fiber mesh can effectively improve the impact toughness of the matrix, and the X-axis placement position is better; (2)when the mesh number of the fiber web is the same, the impact toughness of the matrix decreases as the number of fiber mesh layers increases; (3)in the case of the same number of fiber net layers, the impact toughness of the matrix increases first and then decreases with the increase of the number of fiber net layers. With a single layer of 30 mesh net added, the impact toughness of the carcass reaches a maximum. Through the electron microscopy of the impact fracture and the mechanical analysis of the fiber net, the reasons for this law are explained, and the method of further optimizing the impact toughness of the matrix is proposed.