轧制方式与速度对ZK60镁合金热轧板显微组织和力学性能的影响  

Effect of Rolling Method and Speed on Microstructure and Mechanical Properties of Hot Rolled ZK60 Magnesium Alloy Plate

作　　者：刘华燊 孙有平[1,2,3] 何江美[1] 罗国健 方德俊 LIU Huashen;SUN Youping;HE Jiangmei;LUO Guojian;FANG Dejun(School of Mechanical and Automotive Engineering,Guangxi University of Science and Technology,Liuzhou 545006,China;Guangxi Earthmoving Machinery Collaborative Innovation Center,Guangxi University of Science and Technology,Liuzhou 545006,China;Guangxi Key Laboratory of Automobile Components and Vehicle Technology,Guangxi University of Science and Technology,Liuzhou 545006,China)

机构地区：[1]广西科技大学机械与汽车工程学院,柳州545006 [2]广西科技大学广西土方机械协同创新中心,柳州545006 [3]广西科技大学广西汽车零部件与整车技术重点实验室,柳州545006

出　　处：《机械工程材料》2023年第12期19-25,共7页Materials For Mechanical Engineering

基　　金：柳州市科技计划项目(2021GBA0102);广西高等学校高水平创新团队资助项目(桂教师范[2019]52号)。

摘　　要：在不同轧制速度(512,768,1024 mm·s^(-1))下对均匀化退火态ZK60镁合金板进行4道次热轧,分别采用单向(4道次方向相同)和交叉(1,3道次方向与2,4道次方向垂直)2种轧制方式,研究了轧制方式和速度对镁合金板组织和力学性能的影响。结果表明:与单向轧制相比,交叉轧制镁合金板的组织均匀性和综合力学性能较好;随着轧制速度的增加,动态再结晶晶粒尺寸先减小后增大,抗拉强度先升后降,断后伸长率增大。在交叉轧制和768 mm·s^(-1)的轧制速度下,ZK60镁合金板可获得良好的组织和力学性能,此时镁合金板已基本发生完全再结晶,晶粒细小均匀,抗拉强度为322.4 MPa,断后伸长率为15.7%。ZK60 magnesium alloy plates in the homogenized annealed state were hot rolled for 4 passes at different rolling speeds of 512, 768, 1 024 mm·s^(-1 ), and the rolling methods included unidirectional rolling(4 passes with the same direction) and cross rolling(direction of the first and the third passes perpendicular to the second and the forth passes). The effects of rolling method and speed on the microstructure and mechanical properties of magnesium alloy plate were studied. The results show that compared with those by unidirectional rolling, the microstructure uniformity and comprehensive mechanical properties of cross-rolled magnesium alloy plates were relatively good. With the increase of rolling speed, the dynamic recrystallized grain size decreased first and then increased, the tensile strength increased and then decreased, and the percentage elongation after fracture increased. ZK60 magnesium alloy plates with good microstructure and mechanical properties could be obtained by cross rolling and rolling speed of 768 mm·s^(-1);at this time, the complete recrystallization of the magnesium alloy plate basically occurred, and the grains were fine and uniform;the tensile strength was 322.4 MPa, and the percentage elongation after fracture was 15.7%.

关 键 词：ZK60镁合金 轧制方式 轧制速度 显微组织 力学性能 

分 类 号：TG146.22[一般工业技术—材料科学与工程]