自然时效、加工硬化对共享单车轮毂微观组织及性能影响研究  

Effect of Natural Aging and Work Hardening on Microstructure and Performance of Shared Bicycle Wheels

作　　者：李南婷 鲁若鹏 赵宇宏[1] 闫希 崔云波 侯华[1] LI Nan-ting;LU Ruo-peng;ZHAO Yu-hong;YAN Xi;CUI Yun-bo;HOU Hua(School of Materials Science and Engineering,North University of China,Taiyuan 030051,China;Taiyuan Kangmei Technology Development Co.,Ltd.,Taiyuan 030400,China)

机构地区：[1]中北大学材料科学与工程学院,太原030051 [2]太原市康镁科技发展有限公司,太原030400

出　　处：《精密成形工程》2022年第3期116-123,共8页Journal of Netshape Forming Engineering

基　　金：国家自然科学基金(51801189);山西省科技重大专项(20191102008);山西省青年科技研究基金(201801D221152);中北大学青年学术带头人资助(11045505);中央引导地方科技发展专项资金(YDZX20191400002796)。

摘　　要：目的以不同工作状态下AM60B镁合金压铸成形的共享单车轮毂为研究对象,探讨镁合金作为自行车轮毂材料的实际应用特性。方法选取直接压铸的镁合金轮毂A,放置4年的轮毂B以及通过疲劳试验模拟高强度使用后的轮毂C为研究对象,对不同状态下压铸镁合金轮毂的微观组织、力学性能与阻尼性能进行研究。结果轮毂A抗拉强度为215 MPa,屈服强度为97 MPa,伸长率为17.86%;轮毂B中微观组织几乎无变化,但塑性出现一定下降,其阻尼性能最佳;轮毂C拥有更好的强度及塑性,阻尼性能有所改善。结论轮毂B塑性的下降与阻尼的提升可能与固溶原子的扩散有关。轮毂C出现了加工硬化的现象,局部存在混晶组织,这是其性能增强的原因所在。The work aims to study the shared bicycle wheels of die-casting AM60B magnesium alloys under different working conditions to explore the practical application characteristics of Mg-alloy as bicycle wheels.The wheel A of die-casting magnesium alloy,the wheel B placed for four years,and the wheel C used in high intensity simulated by fatigue test were se-lected as the research objects to study the microstructure,mechanical properties and damping properties of die-casting alloy un-der different states.The tensile strength of the wheel A was 215 MPa,yield strength was 97 MPa,and elongation was 17.86%.The microstructure of wheel B had almost no change,but the plasticity declined to some extent,and the damping performance was the best.After fatigue test,wheel C had better strength and plasticity,and the damping performance was improved.The de-crease in plasticity of the wheel B and the increase in damping performance may be related to the diffusion of solid solution at-oms.The wheel C has a work hardening phenomenon,with a mixed crystal structure locally,which is the reason for the en-hanced performance.

关 键 词：AM60镁合金 显微组织 力学性能 阻尼性能 

分 类 号：TG146.22[一般工业技术—材料科学与工程]