锻压技术

热轧道次对时效态Mg-6Zn合金车板微观组织和力学性能的影响

英文标题：Influences of hot rolling pass on microstructure and mechanical properties for aged Mg-6Zn alloy car plate

作者：王亮亮

分类号：TG146

出版年,卷(期):页码：2020,45(11):44-48

摘要：

为了提高汽车轻量化用板材的综合力学性能，以Mg-6Zn合金作为测试基体，通过实验测试的方式分析时效处理、热轧道次对合金微观组织和力学性能的影响。研究结果表明：经过1道次热轧的晶粒中形成了大量孪晶；经过3道次轧制的合金中产生了更大的变形，生成了部分再结晶晶粒；当经过5道次热轧时，板材发生再结晶，形成了许多尺寸更小的晶粒；经过更多道次轧制后，Mg-6Zn合金获得了更大的硬度。当时效温度达到175 ℃时，合金中形成了许多小尺寸的再结晶晶粒，此时的拉伸强度接近250 MPa，同时伸长率增大至13.8%。经过5道次热轧处理后，断口区域产生众多撕裂棱，合金呈现出脆性断裂的特点；当温度升高到175 ℃时，合金中仍存在大量的撕裂棱，表现为脆性断裂的特点。

In order to improve the comprehensive mechanical properties of plate used for vehicle lightweight, taking Mg-6Zn alloy as base test material, the influences of aging treatment and hot rolling pass on the microstructure and mechanical properties for alloy were analyzed by experiments. The results show that a large number of twin crystal are formed in the grain after one pass of hot rolling, and after three passes of hot rolling, the alloy has greater deformation and partially recrystallized grains. Furthermore, after five passes of hot rolling, the plates recrystallize to form many smaller grains, and after more passes of hot rolling, the Mg-6Zn alloy gains larger hardness. When the aging temperature reaches 175 ℃, many small-sized recrystallized grains are formed in the alloy, and the tensile strength is close to 250 MPa, and the elongation increases to 13.8%. However, after five passes of hot rolling, the fracture area produces many tearing edges and presents the characteristics of brittle fracture. As the temperature rises to 175 ℃, there are still a lot of tearing edges in the alloy, which are characterized by brittle fracture.

基金项目：

重庆市教育委员会科学技术研究计划项目（KJZD-K201803201）

王亮亮（1982-），男，硕士，工程师 E-mail：duiju94ey@126.com

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