H13模具钢表面电火花沉积层工艺及其性能研究

Study on the process and properties of electrical discharging deposition on H13 steel

以部分烧结的WC-Co硬质合金为电极,采用电火花沉积的方法,在H13钢基体表面制备了沉积层,并对影响沉积过程的电极极性、电流及脉冲持续时间等3个关键参数进行了优化,系统测试了硬化层的微观结构和性能.结果表明:负极性连接时,基体表面形成了明显的表面沉积层;在优化的条件下(负极性连接、电流为7A、脉冲持续时间为15ms)和2h电火花处理后,得到了性能优良的沉积层,该沉积层成分具有电极(W和C)及基体的成分(Fe),沉积层的白亮层厚度超过30μm,硬度超过1330Hv,有望在模具行业及耐磨领域中有一定的应用前景.

Using partially sintered WC-Co as the electrode, the deposited layer was prepared on the surface of H13 steel substrate by EDD method. Three key parameters （polarity, current and pulse duration） affecting the deposition process were determined. The microstructure and properties of the hardened layer were systematically tested. The results show that the surface of the substrate is obviously deposited on the surface of the substrate. Under optimized conditions （negative polarity connection, current of 7 A, pulse duration of 15 ms） and 2 h EDD, （W and C） and the matrix composition （Fe）, the white layer thickness of the deposited layer is over 30 μm and the hardness is over 1330 Hv, which is expected to have a certain amount of wear resistance in the mold industry application prospects.