锻压技术

冷轧压下率对汽车电极用W-20Cu合金导电及力学性能的影响

英文标题：Effects of cold rolling reduction rate on electrical conductivity and mechanical properties of W-20Cu alloy for automotive electrodes

作者：郭斌峰刘伟峰马心坦

单位：郑州工业应用技术学院河南科技大学

关键词：W-Cu合金冷轧热处理微观组织力学性能导电性能

分类号：TG146.1+1

出版年,卷(期):页码：2021,46(8):244-250

摘要：

为了提高经铝热反应工艺制得的汽车电极用W-20Cu合金的导电及力学性能，采用冷轧以及450 ℃+1 h的热处理工艺对其性能进行加强。通过实验测试手段，研究不同冷轧压下率下热处理前后W-20Cu合金的导电及力学性能的变化，并深入研究了该合金的性能强化作用机制。研究结果表明：热处理后，合金析出相尺寸明显增大，并且数量也显著增加；冷轧合金基体中形成了更大的析出相，并生成了许多细小的析出相，在Cu基体中呈现弥散态分布状态；冷轧合金进行热处理后获得了更高的电导率，提高冷轧压下率后，合金硬度发生了明显提高，冷轧压下率达到80%时，合金硬度提高至118.6 HV；热处理后，合金强度与塑性得到提升，冷轧压下率为80%的冷轧合金经过450 ℃+1 h热处理后获得了最优综合性能；冷轧压下率为80%时，合金断口形成了脆断组织，经过热处理的断口区域产生了数量众多的韧窝，表现为韧性断裂。

In order to improve the electrical conductivity and mechanical properties of W-20Cu alloy for auto electrodes prepared by thermal-aluminum reaction process, the properties of the alloy were strengthened by cold rolling and heat treatment at 450 ℃+1 h, and the changes of electrical conductivity and mechanical properties for W-20Cu alloy before and after heat treatment under different cold rolling reduction rates were studied by experimental test, and the performance strengthening mechanism of the alloy was further studied. The results show that the size and quantity of precipitates increase significantly after heat treatment, and the larger precipitates and many fine precipitates are formed in the cold rolled alloy matrix, which are dispersed in the Cu matrix. Then, the higher electrical conductivity of cold rolled alloy is obtained after heat treatment, the hardness of alloy is significantly improved after increasing the cold rolling reduction rate, and the hardness of alloy increases to 118.6 HV when the reduction rate reaches 80%. Finally, the strength and plasticity of alloy are improved after heat treatment, the best comprehensive property of cold rolled alloy after the heat treatment at 450 ℃+1 h

is obtained. When the reduction rate is 80%, the brittle fracture structure forms in the fracture of alloy, and a large number of dimples are produced in the fracture area after heat treatment, which shows the phenomenon of ductile fracture.

基金项目：

河南省高等教育教改基金项目（2019SJGLX512）；河南省高等学校重点科研项目(15A460019)

郭斌峰（1977-），男，硕士，讲师 E-mail：gbf19770311@126.com

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