锻压技术

高铜合金连续挤压变形区金属流动及性能研究

英文标题：Research on metal flow and properties in continuous extrusion deformation zone for high copper alloy

作者：花思明1 2 张平则1 刘子利1

分类号：TG379

出版年,卷(期):页码：2021,46(10):0-0

摘要：

为解决连续挤压扩展成形中金属流动不均造成的产品分层等质量问题，采用不同型腔结构连续挤压制得Cu-Sn、Cu-Mg合金，借助光学显微镜和维氏硬度计，观察其宏观、微观组织，并测试其显微硬度。结果表明：合金的材质和模腔结构对金属流动影响较大，入口、出口截面积之比过大会导致合金扩展不完全；合金在腔体截面上、下层的金属流动速度不同，下层的金属流动速度较快；Cu-Sn和Cu-Mg合金的入口区和扩展区的硬度均高于其他位置，Cu-Sn合金在入口区上部存在硬度极大值，Cu-Mg合金在扩展区出口位置的下部存在极大值；Cu-Sn和Cu-Mg合金的变形区内均存在绝热剪切带，随着连续挤压过程的进行，均发生了动态回复和再结晶；Cu-Mg合金的基本变形区内的组织较Cu-Sn合金更均匀，且晶粒较细小。

In order to solve the quality problems of product stratification caused by uneven metal flow in continuous extrusion expansion forming, Cu-Sn alloy and Cu-Mg alloy were prepared by the continuous extrusion with different die cavity structures, and the macro and micro structures of alloys were observed by optical microscope and the micro-hardness was tested by Vickers hardness tester. The results show that the alloy material and the die cavity structure have a great impact on the metal flow, and the bigger ratio between the inlet and outlet cross-sectional areas leads to inadequate alloy expansion. The metal flow velocity of alloy in the upper and lower layers of the die cavity section is different, and the metal flow velocity in the lower layer is faster. The hardnesses of entrance zone and expansion zone of Cu-Sn alloy and Cu-Mg alloy are higher than that of the other areas, the Cu-Sn alloy has a maximum hardness value at the upper part of the entrance zone, and the Cu-Mg alloy has a maximum value in the lower part of the exit position for the expansion zone. There are adiabatic shear bands in the deformation zones of Cu-Sn alloy and Cu-Mg alloy, and the dynamic recovery and recrystallization occur during the continuous extrusion process. The microstructure in the basic deformation zone of Cu-Mg alloy is more uniform than that of Cu-Sn alloy, and the grains are smaller.

基金项目：

江苏高校优势学科建设工程资助项目（PAPD）

作者简介：花思明（1987-），男，博士研究生 E-mail：huasiming1987@126.com 通信作者：张平则（1967-），男，博士，教授 E-mail：zhangpingze@nuaa.edu.cn

参考文献：

[1]Nijenthan Rajendran, Monika Mitka, Marzena Lech-Grega, et al. Effect of tool geometry on the velocity and strain rate fields in continuous rotary extrusion of magnesium AZ91 alloy[J]. Procedia Manufacturing, 2018, (15):264-271.

[2]Kim Y H, Cho J R, Kim K S, et al. A study of the application of upper bound method to the conform process[J]. Journal of Materials Processing Technology, 2000，(97):153-157.

[3]何宇.Cu-Mg合金接触线连续挤压接触应力分布函数的建立[J]. 材料导报,2017,31(30):489-494.

He Y. Establishment of contact stresses distribution function for Cu-Mg alloy contact wire continuous extrusion[J]. Materials Reports, 2017, 31(30):489-494.

[4]张景峰,王雪,李冰,等.挤压轮转速对黄铜棒材连续挤压扩展成形的影响[J].塑性工程学报,2020,27(1):14-20.

Zhang J F, Wang X, Li B, et al. Effect of extrusion wheel angular velocity on continuous extrusion expansion forming of brass bar [J].Journal of Plasticity Engineering, 2020, 27(1):14-20.

[5]赵鸿金,杨正斌,岳野,等.连续挤压铜扁排扩展腔及模具的结构优化设计[J].材料科学与工艺,2016,24(5):26-33.

Zhao H J, Yang Z B, Yue Y, et al. Structural optimization design of extending cavity and die of copper strap produced by continuous extrusion[J]. Materials Science ＆ Technology, 2016,24(5):26-33.

[6]王猛,运新兵,裴久杨,等.压实轮压下量对铜棒材连续挤压轮槽区组织的影响[J].塑性工程学报,2018,25(2):91-98.

Wang M, Yun X B, Pei J Y, et al. Effect of coining roll reduction on microstructure in wheel groove during continuous extrusion of copper bar[J]. Journal of Plasticity Engineering,2018,25(2): 91-98.

[7]Bi S, Yun X Y, Pei J Y, et al. Microstructure evolution of Al-Sr master alloy during continuous extrusion[J]. Trans. Nonferrous Met. Soc. China, 2017, (27):305-311.

[8]Yuan Y, Zhou L, Zhu X, et al. Microstructure evolution and properties of Cu-Cr alloy during continuous extrusion process[J]. Journal of Alloys and Compounds, 2017, (703):454-460.

[9]靳晨,刘新宽,刘平,等.C194合金连续挤压全过程的组织与性能演变[J].功能材料,2016,47(4): 04164-04168.

Jin C, Liu X K, Liu P, et al. Microstructure and property development of C194 copper alloy during continuous extrusion[J]. Jorunal of Functional Materials, 2016, 47(4): 04164-04168.

[10] 董少峥,陈莉,李冰,等.模腔通道长度对铜材连续挤压产品组织性能的影响[J].塑性工程学报,2013,20(3):26-30.

Dong S Z, Chen L, Li B, et al. Effects of die-chamber channel length on the microstructure and mechanical properties of copper strip during continuous extrusion[J].Journal of Plasticity Engineering, 2013, 20(3):26-30.

[11] 陈汉文.连续挤压生产产品质量缺陷综述[J].有色金属加工,2010,39(6):29-30.

Chen H W. Quality defects of productin continuous extrusion process [J].Nonferrous Metals Processing, 2010, 39(6): 29-30.

[12] 陈汉文.连续挤压生产产品质量缺陷综述（续）[J].有色金属加工,2011,40(1):27-31.

Chen H W. Quality defects of production continuous extrusion process (Continued) [J]. Nonferrous Metals Processing, 2011, 40(1):27-31.

[13] 王国迎.连续挤压铜杆常见的问题及预防措施[J].有色金属加工,2020,49(2):38-42.

Wang G Y. Common problems and preventive measures on continuous extrusion of copper rods[J].Nonferrous Metals Processing,2020,49(2):38-42.

[14] 袁远,陈立明,张海波,等.Cu-Mg合金接触线产品分层缺陷分析[J].矿冶工程,2019,39(2):108-114.

Yuan Y, Chen L M, Zhang H B, et al. Analysis of delamination defects of Cu-Mg alloy contact wire[J].Mining and Metallurgical Engineering, 2019, 39(2):108-114.

[15] 杨守山.有色金属塑性加工学[M].北京：冶金工业出版社,1982.

Yang S S. Plastic Processing of Nonferrous Metals[M]. Beijing: Metallurgical Industry Press, 1982.

[16] 李峰,林俊峰,张鑫龙,等.连续变截面直接挤压成形技术研究[J].材料科学与工艺,2012, 20 (5):55-59.

Li F, Lin J F, Zhang X L, et al. Research on continuous variable cross-section direct extrusion (CVCDE)[J]. Materials Science ＆ Technology,2012, 20(5):55-59.

[17] 郭振华,裴久杨,樊志新,等.外方内圆铜管连续挤压数值模拟与实验研究[J].稀有金属, 2019, 43(1):38-43.

Guo Z H, Pei J F, Fan Z X, et al. FEM simulation and experimental study on continuous extrusion process for copper tube with outer square and inner circle[J]. Chinese Journal of Rare Metals, 2019, 43(1):38-43.

[18]卢利平,运新兵,杨俊英,等.铜镁合金线材连续挤压扩展变形行为研究[J].热加工工艺, 2010,39(15):92-95.

Lu L P, Yun X B, Yang J Y, et al. Study on deforming behavior of copper-magnesium alloy wire in extending continuous extrusion process[J]. Hot Working Technology,2010,39(15):92-95.

[19] 孙秀荣,王会珍,杨平.不同结构材料高速应变绝热剪切带分析[J].中国体视学与图像分析,2012,17(4):329-335.

Sun X R, Wang H Z, Yang P. Analysis of adiabatic shear bands at high strain rates in three materials with different crystal structures[J]. Chinese Journal of Stereology and Image Analysis,2012,17(4):329-335.

[20] 杨扬,程信林,李正华,等.冶金因素影响绝热剪切带形成的金相观察[J].稀有金属材料与工程,2003,32(4):261-263.

Yang Y, Cheng X L, Li Z H, et al. Effects of metallurgical factors on the forming of adiabatic shear band[J].Rare Metal Materials and Engineering,2003,32(4):261-263.

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