Quench sensitivity and microstructure evolution of a 6351 aluminum alloy
(0) The quench sensitivity of a 6351 alloy was determined by time-temperature-transformation (TTT) curves and time-temperature-property (TTP) curves by an interrupted quench technique with the measurement of the hardness as aged and electro-conductivity as quenched.The microstructure transformation during isothermal treatment was studied by the transmission electron microscope (TEM) and Avrami equation.The results showed that the electro-conductivity increased and the hardness decreased with the holding time prolonged at a certain isothermal temperature.TEM microstructure observation indicated that the supersaturated solid solution decomposed and needles β precipitated during the initial stage of isothermal holding.With the prolongation of keeping time at the nose temperature,rods β and plate β phases formed.The isothermal transformation rate at 360℃ is the fastest,while that at 280℃slower,and that at 440℃ the slowest.The nose temperature of TTT and TTP curves is about 360℃ and the high quench sensitive temperature range is about 230-430℃.The quench factor analysis indicated that the cooling rate should be more than 15℃/s in the quench sensitive areas during quenching to get optimal mechanical properties.
Microstructure evolution quench sensitivity time-temperature-properties curve quench factor analysis
Li Shenlan Huagng Zhiqi Chen Weiping Liu Zhiming Qi Wenjun
School of Mechanical & Automotive Engineering, South China University of Technology, Guangzhou 51064 Guangdong Fenglu aluminum Co.Ltd., Foshan 528133, China; School of Materials Science and Engineering School of Mechanical & Automotive Engineering, South China University of Technology, Guangzhou 51064 Guangdong Fenglu aluminum Co.Ltd., Foshan 528133, China Guangzhou Research Institute of Nonferrous Metals, Guangzhou 510650, China
国际会议
上海
英文
31-31
2012-10-19（万方平台首次上网日期，不代表论文的发表时间）