Effect of cross wedge rolling on the microstructure of GH4169 alloy  

作　　者：Ning Zhang Bao-yu Wang Jian-guo Lin 

机构地区：[1]School of Mechanical Engineering, University of Science and Technology Beijing, Beijing 100083, China [2]Deparment of Mechanical Engineering, Imperial College, London SW7 2AZ, UK

出　　处：《International Journal of Minerals,Metallurgy and Materials》2012年第9期836-842,共7页矿物冶金与材料学报（英文版）

基　　金：supported by the National Natural Science Foundation of China (No.50975023);the National Science and Technology Major Project (No.2009ZX04014-074);Beijing Natural Science Foundation (No.3082013)

摘　　要：The metal microstructure during the hot forming process has a significant effect on the mechanical properties of final products. To study the microstructural evolution of the cross wedge rolling （CWR） process, the microstructural model of GH4169 alloy was programmed into the user subroutine of DEFORM-3D by FORTRAN. Then, a coupled thermo-mechanical and microstructural simulation was performed under different conditions of CWR, such as area reduction, rolling temperature, and roll speed. Comparing experimental data with simulation results, the difference in average grain size is from 11.2% to 33.4% so it is verified that the mierostructural model of GH4169 alloy is reliable and accurate. The fine grain of about 12-15 p.m could be obtained by the CWR process, and the grain distribution is very homogeneous. For the symmetry plane, increasing the area reduction is helpful to refine the grain and the value should be around 61%. Moreover, when the roiling temperature changes from 1000 to 1100℃ and the roll speed from 6 to 10 r.min-1, the grain size of the rolled piece decreases first and then increases. The temperature may be better to choose the value around 1050℃ and the speed less than 10 r-min-1.The metal microstructure during the hot forming process has a significant effect on the mechanical properties of final products. To study the microstructural evolution of the cross wedge rolling （CWR） process, the microstructural model of GH4169 alloy was programmed into the user subroutine of DEFORM-3D by FORTRAN. Then, a coupled thermo-mechanical and microstructural simulation was performed under different conditions of CWR, such as area reduction, rolling temperature, and roll speed. Comparing experimental data with simulation results, the difference in average grain size is from 11.2% to 33.4% so it is verified that the mierostructural model of GH4169 alloy is reliable and accurate. The fine grain of about 12-15 p.m could be obtained by the CWR process, and the grain distribution is very homogeneous. For the symmetry plane, increasing the area reduction is helpful to refine the grain and the value should be around 61%. Moreover, when the roiling temperature changes from 1000 to 1100℃ and the roll speed from 6 to 10 r.min-1, the grain size of the rolled piece decreases first and then increases. The temperature may be better to choose the value around 1050℃ and the speed less than 10 r-min-1.

关 键 词：SUPERALLOYS nickel alloys cross wedge rolling microstructural evolution grain size numerical analysis 

分 类 号：TG146.15[一般工业技术—材料科学与工程] TQ414.99[金属学及工艺—金属材料]