高温环轧工艺对两种离心铸造轻合金机械性能和微观结构影响的综合比较研究

Danesh M-Rahmani, Faramarz Fereshteh-Saniee
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摘要

由不同合金制成的高性能无缝环已广泛应用于各种领域。本研究比较了高温径向轴向环轧(RARR)工艺对离心铸造的 Al6063 铝环和 AM60 镁环机械性能的影响。这两种合金的铸环在 200、250 和 300 °C 三种温度和 40、60 和 80 rpm 三种轧辊转速下进行环轧。根据硬度和平均晶粒大小(AGS)测定了铸造和轧制的铝环和镁环在不同方向(即轧制方向(RD)、横向(TD)和法线方向(ND))的屈服应力、极限强度和断裂应变。经过 RARR 工艺处理的两种材料的晶粒尺寸都小于中心铸造的材料。此外,温度和/或主辊转速越高,AGS 越大,最终轧制的环的屈服应力、极限强度和硬度也越低。不过,在所有实验中,AM60 样品的 AGS 都比相关的 Al6063 环大很多。铝轧制环的极限强度、断裂应变和韧性也比类似变形的镁试样大,尽管后者的比强度远高于前者。与铝试样相比,变形镁环的各向同性更强。加工温度对这两种合金应变硬化行为的影响也不尽相同。RARR 工艺的数值模拟还表明,径向的最大、中等和最小等效应变分别产生于变形环的外部、内部和中间区域,这与这些区域 AGSes 的实验结果一致。
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An inclusive comparative study on the influences of the ring rolling process at elevated temperatures on the mechanical properties and microstructures of two centrifugally cast light alloys
High-performance seamless rings made from different alloys have widely been used in various applications. This study compares the effects of the radial–axial ring rolling (RARR) process at elevated temperatures on the mechanical properties of centrifugally cast Al6063 aluminum and AM60 magnesium rings. The cast rings of these two alloys were ring rolled at three temperatures of 200, 250, and 300 °C and three roll rotational speeds of 40, 60, and 80 rpm. The yield stress, ultimate strength and fracture strain of the cast and rolled Al and Mg rings were measured for different directions, namely, rolling direction (RD), transverse direction (TD), and normal direction (ND), as determined by their hardness and the average grain size (AGS). The grain sizes of both the materials after the RARR process were smaller than the cent-cast ones. Moreover, the higher the temperature and/or the main roll rotational speed, the greater the AGS and the lower the yield stress, ultimate strength and hardness of the finally rolled ring. Nevertheless, the AGS of the AM60 samples was much larger than the related Al6063 rings in all the experiments. The ultimate strength, fracture strain and toughness of the Al rolled rings were also larger than the similarly deformed Mg samples, although the specific strength of the latter was much superior to the former. The deformed Mg rings characterized a more isotropic behavior compared to the Al specimens. The effects of the process temperature on the strain-hardening behaviors of these two alloys were also dissimilar. The numerical simulations of the RARR process also illustrated that the maximum, moderate, and minimum equivalent strains in the radial direction were created at the outer, inner, and middle regions, respectively, of the deformed ring, which is in agreement with the experimental findings for the AGSes at these areas.
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来源期刊
CiteScore
3.80
自引率
16.70%
发文量
370
审稿时长
6 months
期刊介绍: The Journal of Process Mechanical Engineering publishes high-quality, peer-reviewed papers covering a broad area of mechanical engineering activities associated with the design and operation of process equipment.
期刊最新文献
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