摘要
采用金相、扫描电镜、透射电镜、显微硬度测试等方法对3104合金大尺寸铸锭的均匀化制度进行研究。研究结果表明：在均匀化过程中,晶粒内部析出大量Al（Mn,Si）相和Al（Mn,Fe,Si）相;铸锭表面区域的析出相分布较均匀,而铸锭中部经过580℃/（4～12 h）均匀化后的析出相分布不均匀,晶界和晶粒中心存在无析出带,析出相细小;随着温度升高,析出相分布更加均匀,密度降低,粒度长大;铸锭晶粒内部的初始显微硬度不均匀,经过均匀化处理,晶粒边界硬度下降,而晶粒中心硬度上升,显微硬度差别减少;经过600℃/（8～12 h）均匀化,显微硬度最低,且最均匀;铸锭均匀化处理对后续的再结晶退火有显著影响,铸锭经过600℃/12 h均匀化,与经过450℃/12 h相比,后续冷轧产品经过再结晶退火后具有更高的延伸率,晶粒更细小均匀;合适的均匀化处理制度为600℃/（8～12 h）。
The homogenization processing of 3104 alloy large size slab was studied by OM, SEM, TEM and hardness test. The results show that after homogenization, AI（Mn,Si） and AI（Mn,Fe,Si） particles precipitate at the slab surface area, and the distribution is more even than at the slab center. After 580℃/（4-12 h） treatment, the distribution is uneven with no precipitation at the grain boundary and inner, and the precipitation size is small and the density is high. With the increase of temperature, the precipitation distribution becomes more even with lower density and bigger size. The HV hardness is uneven in the primary grain. After homogenization, the HV at the grain boundary decreases and the inner increases. The HV difference reduces to the smallest after 600℃/（8-12 h） treatment. The slab has smaller grain size, lower σb, higher δ after recrystallization for the homogenization of 600 ℃/12 h compared with 450 ℃/12 h. The best homogenization is 600 ℃/（8-12 h）.
出处
《中南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2013年第5期1813-1821,共9页
Journal of Central South University:Science and Technology
基金
中铝科技基金资助项目(ZB2010CCDBJ1)
