Prediction of properties distribution of 7B50 alloy thick plates after quenching and aging by quench factor analysis method

作     者：Lei Kang Yi-Ran Zhou Gang Zhao Kun Liu Ni Tian 

作者机构：Key Laboratory for Anisotropy and Texture of MaterialsMinistry of EducationSchool of Materials Science and EngineeringNortheastern UniversityShenyang 110819China Department of Applied ScienceUniversity of Quebec at ChicoutimiSaguenayQC G7H 2B1Canada 

出 版 物：《Rare Metals》 (稀有金属（英文版）)

年 卷 期：2019年第38卷第11期

页      面：1043-1050页

核心收录：

学科分类：08[工学] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）] 

基　　金：financially supported by the National Key Research and Development Program of China(No.2016YFB0300801) the National Natural Science Foundation of China(No.51371045) 

主　　题：7B50 aluminum alloy Quench factor analysis method Time-temperature-properties curve Continuous cooling curve Properties prediction 

摘      要：In the present work,continuous cooling curves were accurately measured by the modified Jominy specimen of 7B50 alloy during water-spray quenching ***,the time-temperature-properties(TTP) curves of this alloy were obtained during isothermal *** on the accurate cooling curves and TTP curves,the hardness distribution along the thickness direction of 7B50 alloy thick plates was predicted by quench factor analysis *** is found that the quench sensitive temperature range of 7B50 alloy is 240-410℃,the nose temperature is 335℃,and the incubation period at the nose temperature is about 0.87 *** 7B50 alloy was isothermal treated at 180-400℃ after solid solution treatment(470℃ for 1 h followed by 483℃ for 2 h),the exponent(n) in the Johnson-Mehl-Avrami equation is close to 1 until transformed fraction of new precipitates is up to 60%,indicating that new precipitates first grow into rodlike shape and then coarsen or *** the distance is less than 65 mm from the spray quenching surface of the modified Jominy specimen,the deviation between the predicted and measured hardness is less than 2.7%,confirming the quench factor analysis method as the feasible way to predict the hardness distribution along the thickness direction of 7B50 alloy thick *** the distance from the spray quenching surface is 25 mm,the average cooling rate in quench sensitive temperature range is 9.93 ℃·s^-1,while the quench factor(τ) is 9.89 and the corresponding predicted hardness is HV 185.1 equivalent to 97.3% of the maximum measured hardness of 7B50 alloy in T6 temper.