利用力学性能测试等手段研究了淬火方式以及时效条件对6005A合金力学性能的影响,确定了6005A的合金的TTP(time temperature properties)曲线,发现其鼻尖温度在370℃左右。研究了7005合金的双级时效过程,该合金淬火后,经105℃,8h+155℃,5...利用力学性能测试等手段研究了淬火方式以及时效条件对6005A合金力学性能的影响,确定了6005A的合金的TTP(time temperature properties)曲线,发现其鼻尖温度在370℃左右。研究了7005合金的双级时效过程,该合金淬火后,经105℃,8h+155℃,5h的双级时效,可获得HB为116的高硬度。展开更多
The quench sensitivity of 6351 alloy was determined by the time temperature-transformation（TTT） curves and time temperature-property（TTP） curves by an interrupted quench technique with measurement of as-aged hardn...The quench sensitivity of 6351 alloy was determined by the time temperature-transformation（TTT） curves and time temperature-property（TTP） curves by an interrupted quench technique with measurement of as-aged hardness and as-quenched electro-conductivity.The microstructure transformation during isothermal treatment was studied by the transmission electron microscopy（TEM） and Avrami equation.The results showed that the electro-conductivity of the 6351 alloy increased and the hardness decreased with prolonging the holding time at a certain isothermal temperature.The TEM observation indicated that the supersaturated solid solution decomposed and needles β″ precipitated at the initial stage of isothermal holding.With the prolongation of holding time at the nose temperature,rod β＇ and plate β phases formed.The isothermal transformation rate at 360℃ was the fastest,and became slow at 280℃ and reached the slowest at 440℃.The nose temperatures of the TTT and TTP curves were about 360℃ and the high quench sensitive temperature range was 230 430℃.The quench factor analysis indicated that the cooling rate should be more than 15℃/s in the quench sensitive areas in order to get optimal mechanical properties.展开更多
文摘利用力学性能测试等手段研究了淬火方式以及时效条件对6005A合金力学性能的影响,确定了6005A的合金的TTP(time temperature properties)曲线,发现其鼻尖温度在370℃左右。研究了7005合金的双级时效过程,该合金淬火后,经105℃,8h+155℃,5h的双级时效,可获得HB为116的高硬度。
基金Project(2012M511552) supported by China Postdoctoral Science FoundationProject(2009A080205001) supported by the State Key Fundamental Research Program of China
文摘The quench sensitivity of 6351 alloy was determined by the time temperature-transformation（TTT） curves and time temperature-property（TTP） curves by an interrupted quench technique with measurement of as-aged hardness and as-quenched electro-conductivity.The microstructure transformation during isothermal treatment was studied by the transmission electron microscopy（TEM） and Avrami equation.The results showed that the electro-conductivity of the 6351 alloy increased and the hardness decreased with prolonging the holding time at a certain isothermal temperature.The TEM observation indicated that the supersaturated solid solution decomposed and needles β″ precipitated at the initial stage of isothermal holding.With the prolongation of holding time at the nose temperature,rod β＇ and plate β phases formed.The isothermal transformation rate at 360℃ was the fastest,and became slow at 280℃ and reached the slowest at 440℃.The nose temperatures of the TTT and TTP curves were about 360℃ and the high quench sensitive temperature range was 230 430℃.The quench factor analysis indicated that the cooling rate should be more than 15℃/s in the quench sensitive areas in order to get optimal mechanical properties.
