锻压技术

锡青铜在热挤压状态下晶粒与晶界的微观变化

英文标题：Microscopic variation of grain and grain boundary for tin bronze in hot extrusion

作者：尹馨妍1 樊文欣1 惠均2 吉梦雯1

单位：(1.中北大学机械工程学院山西太原 030051 2.中北大学材料科学与工程学院山西太原 030051)

关键词：锡青铜热挤压晶界分布 EBSD 再结晶

分类号：TG142.7

出版年,卷(期):页码：2018,43(5):0-0

摘要：

衬套用料锡青铜通过感应加热升温至620~720 ℃的范围内进行反挤压试验，挤压后的试样通过光学显微镜（OM）观察其显微组织，并进行了EBSD试验。结果表明：随温度从620 ℃升高至720 ℃，再结晶晶粒尺寸从9 μm升高到15 μm，晶粒的长径比从1.66增加至1.78，等轴化趋势减小，晶粒呈不规则状。通过对取向差和CLS晶界研究发现，随着温度的升高，孪晶逐渐增多，主要分布在再结晶晶粒内部，这说明热挤压过程中是以动态再结晶为主导、孪晶的协调的混合机制而发生的塑性变形。其中晶界分布以大角度晶界（>15°）为主，呈单峰特征，峰值处于晶界角度60°处，主要为Σ3晶界，随着再结晶的进行，ΣCSL晶界相互转化，其中Σ3晶界与再结晶分数呈正比关系。

The backward extrusion experiment of bushing with tin bronze was conducted by induction heating up to 620-720 ℃, the microstucture of sample after extrusion was observed by optical microscope (OM), and the test of EBSD was conducted. The results show that with the temperature rising from 620 ℃ to 720 ℃, the recrystallization grain size is increased from 9 μm to 15 μm, and the ratio of grain length to diameter increases from 1.66 to 1.78. Thus, the isometric trend decreases and the grains are irregular. The study of misorientation and CLS grain boundary shows that with the increasing of temperature, the twin crystals increase gradually and mainly distribute inside the recrystallization grain. And the hot extrusion process is a plastic deformation process occuring due to the mixing mechanism that the dynamic recrystallization is dominant and the twin crystal is coordinated. However, the grain boundary distribution is given priority to large angle grain boundaries (> 15°), and a single pick characteristic displays. Thus, the peak appears at grain boundary angle of 60° with Σ3 grain boundary mainly. With the recrystallization, Σ CSL grain boundary is interconvert into each other, and Σ3 grain boundary is positively related to recrystallization fraction.

基金项目：

山西省科技攻关项目(20120321035-04)

作者简介：尹馨妍（1993-），女，硕士研究生 Email：xinyan0828@qq.com 通讯作者：樊文欣（1964-），男，博士，教授 Email：fanwx@nuc.edu.cn

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