小二次枝晶臂间距Al319 - T7B的热机械变形

H. Sehitoglu, Tracy J. Smith, H. Maier
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引用次数: 4

摘要

采用25 ~ 35 μm的小二次臂间距(SDAS)对铸态Al - 319合金进行了热疲劳和等温变形实验。在T7B过时效状态下对合金进行了研究。在T7B处理的情况下,材料具有尺寸稳定性,但随着时间的推移和温度超过250°C的循环变形,强度会发生相当大的损失。建立了表征材料应力应变响应的双状态变量统一本构模型。该模型处理了温度和应变率的影响,并捕获了微观结构引起的应力-应变响应变化。模拟了同相(TMF IP)和非相(TMF OP)条件下的热机械疲劳响应,随着循环的继续,材料的应力范围降低了50%。强度的降低是由于析出物在高温下显著变粗,并通过透射电镜证实了这一点。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Thermo-mechanical Deformation of Al319 - T7B with Small Secondary Dendrite Arm Spacing
Thermomechanical fatigue and isothermal deformation experiments were conducted on cast Al 319 alloys with small secondary arm spacings (SDAS) in the range of 25 to 35 μm. The alloy was studied in the overaged state designated as T7B. In the case of the T7B treatment the material possesses dimensional stability, but incurs considerable loss of strength with time and cyclic deformation at temperatures exceeding 250°C. A two-state variable unified constitutive model was developed to characterize the stress-strain response for the material. The model handles temperature and strain rate effects and captures the microstructurally induced changes on the stress-strain response. The thermomechanical fatigue response under in-phase (TMF IP) and out-of-phase (TMF OP) conditions was simulated and the material exhibited a decrease in the stress range by as much as 50% with continued cycling. The decrease in strength was attributed to the significant coarsening of the precipitates at high temperatures and was confirmed by transmission electron microscopy.
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