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ZrO2/스테인리스강 접합체의 잔류응력분포에 관한 연구
김태영,김종헌,유연철,권용환 대한금속재료학회(대한금속학회) 1993 대한금속·재료학회지 Vol.31 No.3
Residual stresses of ZrO₂/AISI304 joint were determined by measuring the diffracted X-ray peak shift with an incident angle Ψ, sin²Ψ method and the results were compared with that of Finite Element Method (FEM). In X-ray diffraction method, radial stress in ceramic was mainly compressive decreasing with the distance from the center to edge. And the radial stress in stainless steel was also compressive unexpectedly. It's because that tensile stress developed at A12024/AISI304 interface transformed rapidly into compressive component as distance from the interface increased, and it was confirmed in FEM results. In FEM calculation, high tensile axial stress was found to develop in ZrO₂edge close to interface and also in interlayer. In this study the fracture of joint occurred in the interlayer and it supported the FEM result that high axial stress was developed in the interlayer. There was qualitative agreement between analytical estimation and experimental result and the X-ray diffraction method with the FEM analysis seems to be effective to determine the residual stress in metal/ceramic joint.
김태영,유연철,오병문 대한금속재료학회(대한금속학회) 1991 대한금속·재료학회지 Vol.29 No.9
The high temperature deformation behaviors of the V-microalloyed steel were studied by hot torsion test at temperatures from 900 to 1050℃ and in the range of strain rate from 2.0 sec^(-1) to 2.0×10^(-2) sec^(-1). Within the experimental range, this steel exhibited typical dynamic recrystallization shapes of the flow curve. The dynamic recrystallization behaviors were analyzed with changing of deformation conditions from single to multiple peak deformation, and the metallographic observations on the two types flow curves revealed that the single peak flow curves were associated with grains refinement and the multiple peak flow curves were associated with grains coarsening. The sizes of the dynamically recrystallized grains were also measured, and they were able to be parameter as a function of the Zener-Hollomon presented, Z without exhibiting any dependence on the initial grain sizes. The constitutive equation for hot deformation of this steel, relating the flow stresses to the strain rate and temperature, could be described by power law, ε´= Aσ^n´_p exp(-Q/RT).