【作者】 石德全； 康凯娇；

【Author】 SHI De-quan;KANG Kai-jiao;School of Materials Science and Engineering, Harbin University of Science and Technology;

【机构】 哈尔滨理工大学材料科学与工程学院；

【摘要】 随着现代工业技术的发展,对合金材料性能指标要求提高。铸造合金组织中存在缺陷,常采用固溶时效处理强化改善其性能。但是传统的热处理方法存在耗能大,时间长等缺点。为了改善这些缺点,对ZL114A合金进行电脉冲时效强化处理研究。采用控制变量法,在ZL114A合金进行时效处理时施加电脉冲,改变脉冲电流、脉冲频率及时效时间。通过组织性能分析,选出最佳的电脉冲时效工艺参数,确定电脉冲时效能否有效缩短时效时间。结果表明:时效温度为160℃、占空比0.5一定,脉冲电流8A、脉冲频率700Hz、时效保温5h,合金综合性能较好。由于电脉冲时效过程中有温度场及电场作用,合金内溶质原子快速向两个方向冲击,与普通热处理相比时效时间缩短3h,为以后工业化生产奠定良好的基础。更多还原

【Abstract】 With the development of modern industrial technology, the requirement of alloy material performance index has been improved. There are some defects in the microstructure of cast Al-Si alloy, which is often strengthened by solid solution and aging treatment. However, the traditional heat treatment methods have many disadvantages, such as large energy consumption and long treatment time. In order to improve these defects, ZL114A alloy was studied by electrical pulse aging. ZL114A alloys were treated with electric pulse during aging treatment. The pulse current, pulse frequency and aging time parameter were changed by the control variable method. Through the analysis of microstructure and properties, the optimum process parameters of electric pulse aging are selected and determine whether the aging time can be effectively shortened by electric pulse aging. The result shows that ZL114A alloy had good comprehensive properties when the pulse current, pulse frequency and duty cycle were 8A, 700 Hz and 0.5, and the aging heat preservation 5 h at 160℃. Due to the effect of temperature and electric field in the process of electric pulse aging, the solute atoms in the alloy were rapidly shocked in two directions. Compared with the ordinary heat treatment, the aging time was shortened by 3h. It lays a good foundation for industrial production in the future.更多还原