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采用真空铸渗工艺制备了WC/Cr15钢基表面复合材料,研究了在预置层中添加16.7 vol%钨铁粉对复合层的界面组织和基体硬度的影响。运用OM、SEM、XRD和显微硬度计对复合层的界面组织和基体硬度进行了分析。结果表明,添加16.7vol%钨铁粉改善了复合层的界面组织及力学性能的连续性,有利于降低应力集中,改善应力分布状态;反应层中形成过渡均匀分布的Fe3W3C相,使WC颗粒与基体之间形成组织过渡;复合层基体中形成弥散分布的Fe3W3C相,提高了复合层的基体硬度,增强了复合层基体的耐磨性及其对WC颗粒的支撑与固定作用。
The WC / Cr15 steel matrix composite was prepared by vacuum infiltration process. The effect of adding 16.7 vol% tungsten iron powder on the interfacial microstructure and matrix hardness of the composite layer was studied. The interfacial microstructure and matrix hardness of the composite layer were analyzed by OM, SEM, XRD and microhardness tester. The results show that the addition of 16.7vol% tungsten-iron powder improves the continuity of the interfacial microstructure and mechanical properties of the composite layer, which helps to reduce the stress concentration and improve the stress distribution. In the reaction layer, the uniformly distributed Fe3W3C phase is formed, The matrix forms a microstructure transition; the dispersed matrix Fe3W3C forms in the composite matrix, which increases the matrix hardness of the composite matrix and enhances the wear resistance of composite matrix and supports and immobilizes WC particles.