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Ti-6Al-4V 합금의 형상 링 압연공정 설계 및 제조기술
김국주(K. J. Kim),김남용(N. Y. Kim),이진모(J. M. Lee),염종택(J. T. Yeom) 한국소성가공학회 2009 한국소성가공학회 학술대회 논문집 Vol.2009 No.10
Design and Manufacturing processes of Ti-6Al-4V profiled ring-products were investigated with three-dimensional FEM simulation and experimental analyses. FEM simulation for the ring-rolling process was used to calculate the state variables such as strain, strain rate and temperature. In the simulation results of strain and temperature distributions for a plane ring rolling process, the strain level at the surface area is higher than that at the mid-plane, but the temperature level at the surface area is lower than that at mid-plane due to heat transfer between the workpiece and the work roll. These distributions showed a great influence on the evolution of microstructure in different positions. In order to induce the uniform deformation of the profile ring and reduce the applied load, the final blank was prepared by two-step processes. The mechanical properties of Ti-6Al-4V alloy ring products made in this work were investigated with tensile and impact tests and analyzed with the evolution of microstructures during the ring rolling process.
김태옥(T. O. Kim),김국주(K. J. Kim),김남용(N. Y. Kim),이진모(J. M. Lee),염종택(J. T. Yeom) 한국소성가공학회 2009 한국소성가공학회 학술대회 논문집 Vol.2009 No.10
Aerospace engine application needs to stand high temperature and pressure. Because of its mechanical properties such as high strength at high temperature, Alloy 718 is used aerospace engine application about 80%. But ally 718’s mechanical properties cause some problem to manufacturing profile ring like damage of material and mold. In this study, alloy 718’s mechanical properties investigated for knowing its formability and using FE-Simulation for designing profile ring roll process and mold shape. Profile ring rolling processing is designed with “Initial material→Blank→Linear Ring→Profile ring”. Blank’s heating temperature is setting 1100℃ for manufacturing a trial profile ring on the basis of FE-Simulation. As a result of manufacturing alloy 718 profile ring, it is possible to make near target profile shape ring with all of the processing condition which gives in this study.