An AZ41 magnesium alloy in the hot-rolled condition without further thermomechanical processing to modify its microstructure was investigated to establish its suitability for use within a superplastic forming process ...An AZ41 magnesium alloy in the hot-rolled condition without further thermomechanical processing to modify its microstructure was investigated to establish its suitability for use within a superplastic forming process and to establish optimum forming parameters.Formability was assessed using elevated temperature tensile testing and hot gas bulging,across a range of strain rates(1×10^(−1)−1×10^(−3)s^(−1))and temperatures(350−450℃).Circle grid analysis with GOM Aramis cameras was used to understand peak strains and material thinning in relation to industrial forming processes.Post forming EBSD and STEM analysis was conducted to understand the mechanisms responsible for the materials formability,with dynamic recrystallization being clearly evident.Peak elongation of 520%was achieved at 450℃ and 1×10^(−3)s^(−1);industrially relevant elongation was achieved at 1×10^(−2) s^(−1) at both 450℃(195%)and 400℃(170%).展开更多
本文利用电子背散射衍射(electron backscatter d iffraction,EBSD)技术研究了YUS701奥氏体不锈钢ROF内罩在高温服役前后的显微组织和晶界特征分布。研究结果表明,服役前后YUS701奥氏体不锈钢ROF内罩在显微组织和晶界特征分布上有明显...本文利用电子背散射衍射(electron backscatter d iffraction,EBSD)技术研究了YUS701奥氏体不锈钢ROF内罩在高温服役前后的显微组织和晶界特征分布。研究结果表明,服役前后YUS701奥氏体不锈钢ROF内罩在显微组织和晶界特征分布上有明显的差异,这种差异是ROF内罩超高温运行失效的重要原因。展开更多
基金The authors would like to thank the WMG High Value Manufacturing Catapult Centre for funding this work.In addition,the characterisation facility is supported from the Higher Education Funding Council for England(HEFCE).
文摘An AZ41 magnesium alloy in the hot-rolled condition without further thermomechanical processing to modify its microstructure was investigated to establish its suitability for use within a superplastic forming process and to establish optimum forming parameters.Formability was assessed using elevated temperature tensile testing and hot gas bulging,across a range of strain rates(1×10^(−1)−1×10^(−3)s^(−1))and temperatures(350−450℃).Circle grid analysis with GOM Aramis cameras was used to understand peak strains and material thinning in relation to industrial forming processes.Post forming EBSD and STEM analysis was conducted to understand the mechanisms responsible for the materials formability,with dynamic recrystallization being clearly evident.Peak elongation of 520%was achieved at 450℃ and 1×10^(−3)s^(−1);industrially relevant elongation was achieved at 1×10^(−2) s^(−1) at both 450℃(195%)and 400℃(170%).
文摘本文利用电子背散射衍射(electron backscatter d iffraction,EBSD)技术研究了YUS701奥氏体不锈钢ROF内罩在高温服役前后的显微组织和晶界特征分布。研究结果表明,服役前后YUS701奥氏体不锈钢ROF内罩在显微组织和晶界特征分布上有明显的差异,这种差异是ROF内罩超高温运行失效的重要原因。
