Response of A356 to warm rotary forming and subsequent T6 heat treatment
Response of A356 to warm rotary forming and subsequent T6 heat treatment
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DOI：
10.1016/j.msea.2014.05.088
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发表时间：
2014-06
期刊：
影响因子：
6.4
通讯作者：
M. Roy;D. Maijer
中科院分区：
文献类型：
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作者：
M. Roy;D. Maijer
研究了A356合金在高温旋转成形过程中的组织效应。宏观和微观硬度测试已被广泛用于跟踪材料从铸态到成形态和T6热处理的变化。有针对性的热处理已被用来隔离的影响，通过比较测量的机械变形。这些测量包括宏观和微观硬度测量、能量色散X射线分析以及共晶Si颗粒尺寸和形态的检查。结果表明，铸态材料在高达约144 °C下是稳定的，旋转成形材料表现出随在高温下花费的时间而降低的宏观硬度。热处理后，随着变形程度的增加，硬度显著降低。结果表明，旋转成形对沉淀硬化影响不大，Al-Si共晶相的存在是导致硬度随变形而下降的主要原因。
The through-process microstructural effects in A356 subjected to rotary forming at elevated temperatures have been investigated. Macro- and micro-hardness testing has been used extensively to track changes in the material from the as-cast state to as-formed, and T6 heat treated. Targeted thermal treatments have been used to isolate the effects of mechanical deformation through comparative measurements. These measurements include macro and micro hardness measurements, energy-dispersive X-ray analysis and examination of eutectic-Si particle size and morphology. The results indicate that the as-cast material is stable up to approximately 144 °C, with the rotary formed material exhibiting decreased macrohardness in-line with the time spent at elevated temperature. Post heat treatment, there was a significant decrease in hardness with increased levels of deformation. Results indicate that precipitation hardening is not appreciably affected by rotary forming, and the principal cause for the drop in hardness with deformation is due to the condition of Al–Si eutectic phase.