论文部分内容阅读
为研究常温下晶粒尺寸和厚度对C5210磷青铜力学性能的影响,引入尺寸效应影响因子φ=厚度/晶粒尺寸。结果表明,厚度不同时,随着φ从14.7减小到6.3,屈服强度减小了48%,延伸率由25.5%减小到18.2%;晶粒尺寸不同时,随着φ的减小,屈服强度先快速下降,当φ减小到3.5后便缓慢下降,延伸率则先增大再减小,φ为3.5时延伸率达到最大值29.2%。通过扫描电镜观察拉伸试样断口,均为韧性断裂。厚度不同时,随着φ的增大,韧窝数量增多且尺寸增大,材料塑性较好;晶粒尺寸不同时,φ从10.6减小至3.5,断面收缩率增加,韧窝尺寸增大,材料塑性较好。而当φ值继续减小到0.8时,韧窝数量减少,且尺寸变小,材料的塑性变差。
In order to study the effect of grain size and thickness at room temperature on the mechanical properties of C5210 phosphor bronze, size effect influencing factor φ = thickness / grain size was introduced. The results show that with the different thickness, the yield strength decreases 48% and the elongation decreases from 25.5% to 18.2% as φ decreases from 14.7 to 6.3. When the grain size is different, the yield decreases with φ The strength decreases rapidly at first, decreases slowly when φ decreases to 3.5, and then increases first and then decreases. When φ is 3.5, the elongation reaches the maximum of 29.2%. Tensile fracture was observed by scanning electron microscope. When the thickness is different, with the increase of φ, the number of dimples increases and the size increases, and the plasticity of the material is better. When the grain size is different, φ decreases from 10.6 to 3.5, the reduction of area decreases and the dimple size increases, Plastic material is better. When the value of φ continues to decrease to 0.8, the number of dimples decreases and the size becomes smaller, and the plasticity of the material deteriorates.