锻压技术

TP2紫铜管多道次盘拉过程组织和力学性能变化

英文标题：Changes in microstructure and mechanical properties of TP2 copper tube during multipass bull block drawing process

作者：马春晓1 刘劲松1 2 陈岩2 王松伟2 张士宏2 付铁岩3 张永靖3

单位：1.沈阳理工大学材料科学与工程学院 2.中国科学院金属研究所 3.上海龙阳精密复合铜管有限公司

关键词：TP2紫铜管盘拉显微组织抗拉强度硬度

分类号：TG356.5

出版年,卷(期):页码：2018,43(12):62-66

摘要：

对某公司Φ30 mm×1.4 mm的TP2紫铜管多道次盘拉过程的组织和力学性能进行分析，给出盘拉过程各道次的显微组织，绘制各道次应力-应变曲线，并给出加工过程中抗拉强度与硬度变化规律。结果表明：第0道次横断面不同区域晶粒尺寸不同，第1道次盘拉后不同区域晶粒尺寸趋于一致（加工率30.22％）；随着道次的增加，不同道次相同区域平均晶粒尺寸呈逐渐减小趋势，由21 μm（第0道次）减少至6 μm（第5道次），同时横断面逐渐出现细条状晶粒，纵截面逐渐形成细长的纤维组织；抗拉强度和硬度整体变化呈增大趋势，相对上一道次，抗拉强度在第1和第5道次分别增加了8.3％和10.6％，硬度值在第1和第4道次分别增加了9.6％和9.8％，其余道次抗拉强度和硬度值变化较小。

The microstructure and mechanical properties of a multipass bull block drawing process for Φ30 mm×1.4 mm TP2 copper tube of a company were analyzed, and the metallographic microstructure of each pass was given during the bull block process. Then, the strainstress curve of each pass was plotted, and the change rule of tensile strength and hardness during processing were given. The results show that the grain sizes are different in different crosssection regions at pass0, and after pass1 the average grain size of different regions tends to be the same（the processing rate is 30.22％）. With the increasing of the number of passes ,the average grain size gradually decreases in the same crosssection region of different passes from 21 μm（at pass0）to 6 μm（at pass5）, meanwhile the crosssection gradually appears striplike grains and the longitudinalsection gradually forms elongated fibrous tissue. Compared with the last pass, the tensile strength and hardness values show a increasing trend, and the tensile strengths increase by 8.3％ and 10.6％at pass1 and pass5 respectively. The hardness values increase by 9.6% and 9.8％at pass1 and pass4 respectively, while other passes have very little fluctuations.

基金项目：

基金项目:国家自然科学基金青年基金资助项目(51605307)

作者简介：马春晓（1992-），女，硕士研究生 Email：2291193567@qq.com 通讯作者：刘劲松（1971-），男，博士，副教授 Email：jsliu@imr.ac.cn

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