Research on Quenching Effectiveness of Aluminum Alloy at Roller-hearth Furnace
7075 aluminum alloy plate(thickness 20 mm)with strong quenching sensitivity was selected as the research object,and the electrical conductivity of the whole plate was tested after solution quenching and stretching straightening in roller-hearth furnace.The test results show that the electrical conductivity after quenching is 26 to 31%IACS,when the quenching speed is reduced to 20 m/min,the difference value of the electrical conductivity increases,and the quenching uniformity is poor,which can not meet the requirements of quenching effectiveness.When the quenching speed is in the range of 20 to 40 m/min,the conductivity difference value is less than 2.5%IACS,which meets the requirements of standard AMS 2772.The mechanical properties of the plate after aging are tested,and the tensile strength is 570 to 600 MPa,the yield strength is 520 to 550 MPa,and the elongation is 9%to 13.5%,which can meet the requirements of standard ASTM B209 and EN 485.According to the changes of electrical conductivity and mechanical properties of finished products after quenching,the quenching process can be optimized to ensure the quenching effectiveness of roller-hearth furnace.
NETL
NSTL
万方数据
