针对我国水轮机过流部件磨蚀严重这一问题,选用WC电极对水轮机叶片用1Cr13不锈钢材料进行电火花表面强化处理,对生成的强化层摩擦磨损性能进行了深入研究,并利用扫描电子显微镜和X射线衍射仪对强化层的金相组织、元素分布以及相结构进行了分析.结果表明,强化层的硬度和耐磨性明显高于工件基体,强化层的硬度在白亮层最高,而在强化层与基体的结合区硬度逐渐降低,并在热影响区达到最低.选择高硬度、高合金化的WC电极生成的电火花表面强化层,其硬度可比工件基体提高2～3倍,耐磨性能亦有显著提升.
For the abrasion phenomenon of the turbine flowing-passage components was very serious,the electrical discharge machining（EDM） surface strengthening process of stainless steel 1Cr13 by WC electrode was carried out in this paper.The microstructure,elements distribution,and phase structure of the strengthening layer were analyzed by using scanning electron microscopy and X-ray diffraction,and the hardness and wearing resistance of the strengthening layer were studied by micro-hardness test and wear test.The results show that the hardness and wearing resistance of the strengthening layer are higher than that of the workpiece materials.The hardness in the white-bright area is highest,while that in the heat affected zone is lowest.The hardness of the EDM surface strengthening layer is 2 to 3 times of that of the workpiece matrix.
参考文献
| [1] | 花银群,陈瑞芳,杨继昌,张永康,李长生,路淼.激光淬火和冲击复合强化处理40Cr钢的耐磨性能研究[J].摩擦学学报,2003(05):448-450. |
| [2] | 汪瑞军 .钛合金表面电火花沉积WC-Co强化层及其性能[D].哈尔滨工业大学,2005. |
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