锻压技术

锡青铜在热挤压状态下微观组织及力学性能分析

英文标题：Analysis on microstructures and mechanical properties of tin bronze under hot extrusion

作者：贺全智李辉赵利鼎

单位：吕梁学院

关键词：锡青铜热挤压晶粒取向再结晶 EBSD

分类号：TG142.7

出版年,卷(期):页码：2018,43(4):137-140

摘要：

采用EBSD分析了620~720 ℃范围内锡青铜热挤压组织的晶粒取向的微观变化方式。结果表明：晶粒尺寸随温度升高而增加，从9.3 μm逐渐升高到15 μm；随着温度升高长径比也逐渐升高，从1.66逐渐升高至1.78, 等轴化趋势较小。晶粒取向存在于（111），（001），（101）分布，同时也存在其他不同的取向，并不存在明显的择优取向的织构现象，晶粒呈随机分布。在对拉伸性能的检测中发现，再结晶晶粒对锡青铜的塑性存在一定影响，620~720 ℃范围内，拉伸曲线变化趋势相同，抗拉强度和屈服强度逐渐降低。不同的是，当温度在700 ℃以上时，锡青铜的断面收缩率和伸长率逐渐下降，塑性性能较差。

The microscopic changes of grain orientation for hot extrusion structure of tin bronze within a range of 620~720 ℃ were analyzed by EBSD. The results indicate that with the increasing of temperature, the grain size gradually increases from 9.3 μm to 15 μm, the length-diameter ratio gradually increases from 1.66 to 1.78, and the equiaxed trend is little. However, the grain orientation is presented in (111), (001) and (101) distributions, and other different orientations are also found. Thus, there is no obvious phenomenon of a texture with preferred orientation, and the grains are randomly distributed. In the test of tensile performance, it is found that the recrystallization grains have a certain influence on the plasticity of tin bronze. Within the range of 620~720 ℃, the tensile curves show the same trend. Both the tensile strength and yield strength decrease gradually. The difference is that when the temperature is above 700 ℃, the contraction percentage of cross section and the elongation rate of tin bronze decrease gradually resulting in poor plastic property.

基金项目：

吕梁学院科研基金项目（ZRON201605）

贺全智（1964-），男，学士，副教授；E-mail：djq1652@163.com；通讯作者：李辉（1985-），男，硕士，讲师；E-mail：464956946@qq.com

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