摘要
为研究超声声源数量对2219铝合金铸锭凝固组织与成分分布的影响,在直径为630 mm半连续热顶铸造实验中,分别对熔体施加不同声源数量的超声处理,成功制备了4组不同工艺的高质量铸锭。并利用光学显微镜、直读光谱仪等仪器对铸锭横切面进行凝固组织与成分检测。结果表明:在熔体中施加超声处理能有效地细化组织,减小晶粒尺寸,并随着声源数量的增加,晶粒细化效果得到增强,但显微组织的均匀性减弱;对铝熔体施加超声处理,溶质元素的宏观偏析程度也得到显著改善,但这种效果随着声源数量的增加而减弱。
In order to study the effect of the number of ultrasonic sound sources on solidification structure and composition distribution of 2219 aluminum alloy ingot, ultrasonic treatment with different sound sources was applied to the melt in a semi-continuous hot top casting experiment with a diameter of 630 mm, and four groups of high quality ingot with different processes were successfully prepared. The solidification microstructure and composition of the ingot were measured by optical microscope and direct reading optical emission spectrometer. The results show that the ultrasonic treatment can effectively refine the microstructure and decrease the grain size of the 2219 aluminum alloy ingot, and with the increase of the number of ultrasonic sound sources, the effect of grain refinement is enhanced, but the uniformity of microstructure is weakened. The macro segregation degree of solute elements of aluminum melt is improved significantly by ultrasonic treatment, but the effect is weakened with the increase of the number of ultrasonic sound sources.
作者
杨林学
张立华
李瑞卿
YANG Lin-xue;ZHANG Li-hua;LI Rui-qing(Light Alloy Research Institute, Central South University, Changsha 410083, China;National Key Laboratory of High Performance and Complex Manufacturing, Changsha 410083, China)
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2019年第3期49-55,共7页
Transactions of Materials and Heat Treatment
基金
国家自然科学基金(51575539
51475480
U1637601)
关键词
铝合金
超声铸造
声源数量
组织细化
成分偏析
aluminum alloy
ultrasonic casting
number of ultrasonic sound sources
microstructure refinement
composition segregation
