添加重熔料后ZL205A合金的组织与性能

Microstructure and mechanical properties of ZL205A alloy with returns

通过向ZL205A合金铸锭中添加不同比例的重熔料,进行重熔、浇注。对利用ZL205A合金组织遗传性细化合金晶粒、提高合金力学性能进行初步研究。结果表明,ZL205A合金添加不同含量重熔料后,合金组织均有所细化;合金性能随着重熔料含量的增加先增大后减小。当重熔料含量为20%时,合金组织最为细小,晶粒尺寸达到33μm左右;铸态力学性能达到最优,抗拉强度比原料ZL205A合金抗拉强度提高了11.6%,屈服强度和伸长率均较高,分别为87.6MPa及7.5%。进一步增加重熔料含量,合金组织粗化,力学性能逐渐恶化。

Applications of structure heredity of returns of ZL205A alloy on grain refinement and improving mechanical properties Were investigated. The results show that the addition of returns is contributed to refining the grains of alloy, and with increasing returns content, the mechanical properties increase first, and then decrease. The maximum as-cast performance is achieved when returns content is 20%（mass fraction）, which is shown by the following indications： the average particle size is measured to be 33 μm, and the tensile strength is improved by 11.6% compared with primary alloy, and the yield strength and elongation are also comparatively higher, 87.6 MPa and 7.5%, respectively. But with further increasing the returns content, the microstructure coarsened and the mechanical properties deteriorate.