第十二届全国周培源大学生力学竞赛“理论设计与操作”团体赛“自停滚轮”项目设计方案

本文介绍了江苏科技大学代表队在第十二届全国周培源大学生力学竞赛“理论设计与操作”团体赛“自停滚轮”项目中的设计方案和制作过程,给关心和热爱该比赛的力学爱好者提供参考。

掺杂金刚石电极及电化学应用研究进展

近年来,掺杂金刚石薄膜作为一种新型电极材料备受关注。掺杂金刚石电极具有宽电势窗口、低背景电流、高稳定性、低吸附性等优点,在电化学领域具有极大的应用潜力。介绍了掺杂金刚石电极的制备、电化学性质及影响因素,综述了掺杂金刚石电极在电化学合成、电分析化学和电化学水处理等领域的应用现状,展望了掺杂金刚石电极在电化学领域的应用前景。

Fe含量对反重力铸造ZL210A合金组织与力学性能的影响

采用反重力浇注方式,研究了不同Fe含量对ZL210A合金力学性能和显微组织的影响。结果表明,在避免其他因素影响的前提下,伸长率随Fe元素含量的提高而显著降低,抗拉强度次之,硬度基本不随Fe元素含量的变化而变化。随着Fe元素含量的增加,ZL210A中针状含Fe未溶相逐渐增加,导致伸长率和抗拉强度降低。

Mechanical Behavior and Constitutive Equation of High Temperature Compression Deformation of IN706 Superalloy

IN706 superalloy is particularly sensitive to the parameters of hot working process.The flow stress of the IN706 superalloy was investigated during reduction deformation of 30%,45%,and 60%under the isothermal compression conditions of temperature at 1143–1393 K and strain rate at 0.01,0.1,0.5,and 1 s^(−1).The exponent-type Zener-Hollomon equation was used to describe the impact of strain and temperature on the thermal deformation.Meanwhile,the strain effect of various material constants,such asα,n,Q,and lnA,was considered in the constitutive equation considering the strain compensation,and the correlation coefficient R and the average absolute relative error were verified.On the basis of constitutive equation construction,the hot processing map of IN706 superalloy was drawn,and the instability region was obtained based on the Murty criterion.Results show that the reasonable thermal working process parameter window is strain rate of 0.1 s^(−1)and temperature of 1313–1353 K.