大规格铸态7005铝合金的双级均热工艺优化

Optimization of Two-stage Soaking Process for Large-size As-Cast 7005 As-Cast 7005 Aluminum Alloy

为优化工业化生产耗时长、耗能高、效率低的旧双级均热工艺,采用OM、SEM、图像分析软件及布氏硬度计,研究了双级均热工艺对大规格铸态7005铝合金圆锭显微组织和硬度的影响。结果表明:经450℃×2h+470℃×32h双级均热处理后,MgZn2弥散质点完全溶解,仅残留难溶的AlMnFe、AlMnFeSi等含Fe化合物相,均热效果与旧工艺的均热效果一致,可实现工业化节能降本提质增效的生态生产。

In order to optimize the old two-stage homogeneous heat treatment process,which was time-consuming,energy-consuming and inefficient in industrial production,OM,SEM,image analysis software and Brinell hardness tester were used to study the effect of two-stage homogeneous heat treatment process on microstructure and hardness of large-size as-cast 7005 aluminum alloy round ingot.The results show that the MgZn2 dispersing particle is completely dissolved after the dual-stage homogenization treatment at 450℃×2 h+470℃×32 h,and only the remaining refractory phases of Al MnFe,Al MnFeSi and other Fe-containing compounds remained.The homogenization effect is consistent with that of the old process,and the ecological production of energy saving,quality improvement and efficiency enhancement could be realized in industrialization.