C5210磷青铜薄板成形行为的尺度效应（英文）

发布时间：2018-11-05 11:22

【摘要】：为研究厚度、晶粒尺寸对C5210磷青铜薄板力学性能和成形性能的影响,通过不同温度退火热处理得到不同晶粒尺寸的试样,然后在常温下对具有不同厚度和晶粒尺寸的试样进行单向拉伸试验。结果表明:当厚度在50~800μm范围内,材料的屈服强度随着厚度的减小而增大,而加工硬化指数和伸长率随着厚度的减小而减小,提出了描述屈服强度随厚度减小而增大关系的修正模型;材料的屈服强度随着晶粒尺寸的增大而减小,但加工硬化指数随着晶粒尺寸的增大而增大,伸长率则随着晶粒尺寸的增大先增大到一个峰值后再减小。通过扫描电镜观察拉伸试样的断口形貌发现所有试样断裂方式均为韧性断裂,并且随着厚度的增大断口韧窝的密集度增大,而晶粒尺寸越大的试样断口韧窝密集度越小。
[Abstract]:In order to study the effect of thickness and grain size on mechanical properties and formability of C5210 phosphor bronze sheet, samples with different grain sizes were obtained by annealing at different temperatures. Then uniaxial tensile tests were carried out on samples with different thickness and grain size at room temperature. The results show that when the thickness is in the range of 50 ~ 800 渭 m, the yield strength of the material increases with the decrease of the thickness, while the work hardening index and elongation decrease with the decrease of the thickness. A modified model is proposed to describe the relationship between yield strength and thickness. The yield strength of the material decreases with the increase of grain size, but the work hardening index increases with the increase of grain size, and the elongation increases to a peak value and then decreases with the increase of grain size. The fracture morphology of tensile specimens was observed by scanning electron microscope (SEM). It was found that the fracture modes of all specimens were ductile fracture, and the density of fracture dimples increased with the increase of thickness, while the density of fracture dimples increased with the increase of grain size.
【作者单位】：南京航空航天大学机电工程学院;
【分类号】：TG146.11;TG166.2

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