摘要
采用金相显微镜、布氏硬度和力学拉伸等手段研究不同振动幅度对ADC12铸件和经过550℃×4 h固溶,160℃×4 h时效ADC12铸件的微观组织与力学性能的影响。结果表明:振动处理能使ADC12铸件微观组织均匀,共晶平均硅长度减小,在3 000 r/min的振动幅度下,Si的长度达到最小值17μm;铸件经过热处理后,在2 400 r/min的振动幅度下,Si的长度达到最小值10.4μm。随着振动幅度的增加,其抗拉强度和断后伸长率都增加,在3 000 r/min的振动幅度下,铸件抗拉强度达到最大值184 MPa,断后伸长率也达到最大值2%;铸件经热处理后,在2 400 r/min的振动幅度下,铸件抗拉强度达到255 MPa,相比未振动的铸件抗拉强度提高了16%,同时断后伸长率达到试验中最大值3.13%。
The influences of different vibration amplitude, 550 ℃x4 h solid solution and 160 ℃x4 h aging on microstmcture and mechanical properties ofADC 12 alloy were studied by microscopic image, Brinell hardness and tensile test. The results show that vibration treatment could make ADC 12 casting＇s microstructure more homogeneous, reduce eutectic silicon＇s average length. The eutectic silicon reached a minimum length of 17 μm at the vibration amplitude of 3 000 r/min, and ADC 12 casting＇s eutectic silicon reached a minimum length of 10.4 μm at 2 400 r/min after 550 ℃ x4 h solution and 160 ℃ x4 h aging treatment. With the increase of ibration amplitude, the tensile strength and elongation rate increases, and castings reach the maximum tensile strength of 184 MPa and elongation rate of 2% at 3 400 r/min. After 550 ℃ x4 h solution and 160 ℃ x4 h aging treatment, castings have the maximum elongation rate of3.13% and tensile strength of 255 MPa at 2 400 r/min, the tensile strength is 16% higher than that of casting without vibration treatment.
出处
《铸造》
CAS
CSCD
北大核心
2013年第11期1130-1133,共4页
Foundry
基金
高校博士点专项科研基金(20113601110008)
关键词
振动
转速
组织
热处理
力学性能
vibration
rotational speed
microstructure
heat treatment
mechanical properties
