湖南大学学报（自然科学版）2023，Vol.50Issue(12)：86-91,6.DOI:10.16339/j.cnki.hdxbzkb.2023309
淬火水温对7B50铝合金厚板组织和强韧性的影响
Effect of Quenching Water Temperature on Microstructure Strength and Toughness of 7B50 Aluminum Alloy Thick Plate
摘要
Abstract
The effects of quenching water temperature(20～60° C)on the structure,strength and toughness of 7B50 aluminum alloy plate were investigated by using room temperature tensile test,fracture toughness test and the combination of scanning electron microscopy and transmission electron microscopy(TEM).Besides,the sensitivity of different aging treatment systems to the quenching water temperature was also studied.The results show the room temperature tensile properties of 7B50 alloy are not sensitive to the quenching water temperature.However,the frac-ture toughness tends to increase as the quenching water temperature decreases.When the quenching water tempera-ture decreases from 60° C to 20℃,the fracture toughness of the peak-aged and over-aged alloys increase by 12.9％and 11.4％,respectively.The fracture toughness of the peak-aged alloy is more sensitive to the quench water tempera-ture when the quench water temperature is higher(40 ℃ and 60 ℃)compared with the over-aged alloy.TEM obsera-tion results reveal the relationship of the fracture toughness change due to the grain boundary microstructure.As the quench water temperature decreases,the size of the grain boundary precipitation phase of the quenched alloy gradu-ally decreases.Furthermore,the size of the grain boundary precipitates decreases and the width of the precipitates free zone of the aged alloy becomes narrower.Especially,the grain boundary precipitates size and the width of the grain boundary precipitates free zone of the peak-aged alloy varied more significantly with the temperature change.关键词
铝合金/淬火水温/微观组织/拉伸性能/断裂韧性Key words
aluminum alloy/quenching water temperature/microstructure/tensile properties/fracture toughness分类
矿业与冶金引用本文复制引用
任伟才,于明洋,张永安,温凯,李锡武,高文理..淬火水温对7B50铝合金厚板组织和强韧性的影响[J].湖南大学学报（自然科学版）,2023,50(12):86-91,6.基金项目
国家重点研发计划资助项目(2021YFC1910505),National Key Research and Development Program of China(2021YFC1910505) （2021YFC1910505）
