摘要
目的通过显微组织表征和拉伸性能测试等方法,研究轧制温度、多道次累积压下率及轧制路径对ZK60镁合金组织演变和力学性能的影响。方法通过在不同温度(300、340、380、420℃)与同一多道次累积压下率下进行轧制实验,明确了后续轧制实验的轧制温度。随后在同一温度、单个道次压下率为10%、不同累积压下率下进行多道次单向轧制及交叉轧制实验,并对轧制后试样的力学性能及微观组织进行分析。结果当轧制温度为380℃、累积压下率为40.1%时,材料动态再结晶程度最大,平均晶粒尺寸减小为15.48μm,合金抗拉强度和断后伸长率最大,分别为301.46MPa和20.56%。与多道次单向轧制相比,交叉轧制后合金板材基面织构强度明显降低,极密度值降低为9。材料RD方向的抗拉强度提高了6.35%,断后伸长率没有明显变化,TD方向的抗拉强度略微下降,但断后伸长率提高了71.47%,TD方向由脆性断裂转为韧性断裂。结论随着温度与累积压下率的上升,ZK60镁合金的动态再结晶程度提高,晶粒得到细化,材料力学性能得到提升。在相同温度与累积压下率下,经交叉轧制后,材料基面织构显著削弱,材料的各向异性得到改善。
The work aims to study the microstructure evolution and mechanical properties of ZK60 magnesium alloy at dif-ferent rolling temperature,cumulative reduction rates of multiple pass rolling and rolling paths through microstructure charac-terization and tensile property testing.Rolling experiments at different temperature(300,340,380,420)with the same℃multi-pass cumulative reduction rate were carried out to determine the appropriate rolling temperature.Multi-pass unidirectional rolling and cross-rolling experiments were conducted at the same temperature with a single pass reduction rate of 10%and dif-ferent cumulative reduction rates,and the mechanical properties and microstructure of the rolled specimens were analyzed.When the rolling temperature was 380℃and the cumulative reduction rate was 40.1%,the dynamic recrystallisation degree of the material was the highest,the average grain size decreased to 15.48μm,and the alloy had the highest tensile strength and elongation after fracture,which were 301.46 MPa and 20.56%respectively.After cross-rolling,the basal texture strength of the alloy plate was significantly reduced compared with that of multi-pass unidirectional rolling,and the extreme density value de-creased to 9.The tensile strength of the material in the RD direction increased by about 6.35%without significant change in elongation at break,while the tensile strength of the material in the TD direction decreased slightly.However,the elongation at break increased significantly by 71.47%,and the fracture behavior of the magnesium alloy in the TD direction changed from brittle fracture to ductile fracture.With the increase of temperature and cumulative depression rate,the degree of dynamic re-crystallization of ZK60 magnesium alloy increases and the grains are refined.The mechanical properties of the material are im-proved.After cross-rolling at the same temperature and cumulative depression rate,the basal texture is significantly weakened and the anisotropy of the material is improved.
作者
薄东明
卢遥
孙静娜
黄华贵
邓关宇
BO Dong-ming;LU Yao;SUN Jing-na;HUANG Hua-gui;DENG Guan-yu(National Engineering Research Center for Equipment and Technology of Cold Strip Rolling,Yanshan University,Hebei Qinhuangdao 066004,China;Suzhou Inovance Technology Co.,Ltd.,Jiangsu Suzhou 215100,China;School of Mechanical and Mining Engineering,University of Queensland,QLD 4072,Australia)
出处
《精密成形工程》
北大核心
2023年第12期1-11,共11页
Journal of Netshape Forming Engineering
基金
国家自然科学基金(U20A201792)。
关键词
ZK60镁合金
轧制路径
微观组织
织构
力学性能
ZK60 magnesium alloy
rolling path
microstructure
texture
mechanical properties
