[보고서]고속 푸리에 변환을 이용한 소성모델과 몬테카를로 시늉을 이용한 결정성장 모델을 순환 결합한 미소스케일에서의 재결정 모델 개발

이석빈

[국가R&D연구보고서] 고속 푸리에 변환을 이용한 소성모델과 몬테카를로 시늉을 이용한 결정성장 모델을 순환 결합한 미소스케일에서의 재결정 모델 개발
Modelling recyrstallization by iterative coupling the fast fourier transforam (FFT)-based plasticity and the Monte Carlo (MC)-based grain growth algorithm at mesoscale 원문보기

보고서 정보
주관연구기관	울산과학기술원 Ulsan National Institute of Science and Technology
연구책임자	이석빈
보고서유형	최종보고서
발행국가	대한민국
언어	한국어
발행년월	2016-10
과제시작연도	2015
주관부처	미래창조과학부 Ministry of Science, ICT and Future Planning
과제관리전문기관	한국연구재단 National Research Foundation of Korea
등록번호	TRKO201700010468
과제고유번호	1711029391
사업명	신진연구자지원
DB 구축일자	2017-10-12
키워드	재결정.집합조직.결정립계성장.고속푸리에변환.몬테카를로시늉.결정방향경사변화.전자회절EBSD.결정소성변화.recrystallization.texture.grain growth.fast fourier transform.Monte Carlo simulation.orientation gradient.electron backscatter diffraction.crystal plasticity.
DOI	https://doi.org/10.23000/TRKO201700010468

초록 ▼

1차년도: 몬테카를로 시늉을 이용한 3차원 미세구조 재결정 모사코드 개발
3차원 미세구조 내 재결정핵 분포를 통한 3D Monte Carlo Potts 재결정립 성장. 비활성 제2상 분포를 통한 3D Monte Carlo Potts 결정립 성장. Deformed 결정립 및 재결정립 동시 성장 및 온도 변화의 결정 성장에의 영향 모사.
2차년도: FFT바탕의 소성전산모사를 이용한 인장하의 단상 및 복합체의 물성 전산모사 미세구조의 형태학적 변화에 따른 응력장 및 변형률 장의 변화 분석대한 영향 분석. 미세구조 변화를 나타내는 미세구조변수의 제시 및 물성과의 연관성 연구.
3차년도: FFT바탕의 소성전산모사를 이용한 인장하의 특정 복합체의 물성 전산모사 강화상의 공간분포를 정규화한 서로 다른 미세구조의 단위구조 (unit cell)를 전산모사적으로 제작. 단순입방, 체심입방, 면심입방 (SCGP, BCCGP, FCCGP) 미세구조의 입자들 사이의 부피 분율 및 그에 따른 접촉성(contiguity) 변화에 따른 기계적 장의 분포에 대한 심도적, 정량 정성적 연구 분석. 미세구조 변화에 따른 응력 및 변형장의 분리 현상 정량적 분석.
(출처: 연구결과 요약문 4p)

Abstract ▼

1st year: Three-dimensional grain growth and recrystallization simulation with or without inert particles under temperature gradient using the Monte Carlo Potts model.
Recrystallization and grain growth from spatially distributed nuclei in 3d microstructures. The effect of inert particle distribution on the recrystallization behaviour. The effect of temperature gradient on the recrystallization behaviour.
2nd year: Development of FFT-based plasticity algorithm and its application to single/multiphase digital microstructures under tension.
Prediction of the effect of microstructural changes on the stress and strain rate fields using developed simulation code. Study of microstructure-property relationship.
3rd year: Property simulation of (visco)plastic solid under uniaxial tension, where particles are positioned at regular grid points.
The effect of morphology of phases on stress and strain rate field. The effect of volume fraction of particles on stress and strain rate fields. The effect of contiguity on the evolution of mechanical fields using unit cell model.
(출처: Summary 5p)

목차 Contents

표지 ... 1목차 ... 2연구계획 요약문 ... 3연구결과 요약문 ... 4 한글요약문 ... 4 SUMMARY ... 5연구내용 및 결과 ... 6 1. 연구개발과제의 개요 ... 6 2. 국내외 기술개발 현황 ... 7 3. 연구수행 내용 및 결과 ... 9 4. 목표달성도 및 관련분야에의 기여도 ... 24 5. 연구결과의 활용계획 ... 25 6. 연구과정에서 수집한 해외 과학기술정보 ... 25 7. 참고문헌 ... 25 8. 연구성과 ... 26 9. 국가과학기술지식정보서비스에 등록한 연구시설‧장비 현황 ... 28 10. 연구개발과제 수행에 따른 연구실 등의 안전조치 이행실적 ... 28 11. 기타사항 ... 28끝페이지 ... 28

표/그림 (39)

표 고속푸리에변환 (FFT)를 이용한 금속재료의 미세구조 변화
표 Initial microstructure, showing random assignment of orientations to each point
표 Initial microstructure with only the nuclei shown, illustrating the dispersion
표 Intermediate step in the simulation, showing only the non-recrystallized grains
표 Intermediate step in the simulation, showing only the recrystallized grains
표 Final microstructure after 1000 MCS, showing that recrystallization is complete
표 Initial microstructure, random assignment of orientation ssh toow ienagc h point with particles
표 Initial microstructure with only the particles shown, illustrating the dispersion
표 Intermediate step in the simulation showing only some selected grains and particles
표 Intermediate step in the simulation showing the whole microstructure
표 Final microstructure after 500 MCS, showing that grain boundaries with particles are dragged, resulting in the change in its curvature
표 Initial microstructure, showing random assignment of orientations to each deformed point
표 Initial microstructure with the particles (dark blue) and nuclei (green, yellow to red) shown, illustrating the random dispersion
표 Intermediate step in the simulation, showing deformed grains and particles
표 Intermediate step in the simulation, showing the recrystallized grains and particles
표 Final microstructure after 500 MCS, showing that recrystallized grain boundaries with particles are dragged, resulting in the change in its curvature
표 Initial microstructure for study of effect of temperature variation. (LEFT) and Fig. 11. A linearly changing temperature field along one direction (top to bottom) of the sample domain, used for the simulations. The maximum value was 2.5 (top, red) and the minimum value was 0.5 (bottom, blue) (RIGHT)
표 Microstructures from grain growth simulation after 300 MCS using the same initial microstructure. (a) constant kT of 0.5 and (b) varying kT field in Fig. 11
$A microstructure from the coarsening simulation with particle volume fraction of ~0.6$ 표 A microstructure from the coarsening simulation with particle volume fraction of ~0.6
표 A microstructure is the modified polycrystal where ~40vol% of grains are changed into matrix phase
$A stress field of microstructure from the coarsening simulation with particle volume fraction of ~0.6$ 표 A stress field of microstructure from the coarsening simulation with particle volume fraction of ~0.6
표 A stress field of microstructure is the modified polycrystal where ~40vol% of grains are changed into matrix phase
$A strain field of microstructure from the coarsening simulation with particle volume fraction of ~0.6$ 표 A strain field of microstructure from the coarsening simulation with particle volume fraction of ~0.6
표 A strain field of microstructure is the modified polycrystal where ~40vol% of grains are changed into matrix phase
$(a) Average stress and (b) average strain rate as a function of volume fraction for each phase and for overall microstructure after property simulation. Note a linear dependence for each case with small variation$ 표 (a) Average stress and (b) average strain rate as a function of volume fraction for each phase and for overall microstructure after property simulation. Note a linear dependence for each case with small variation
$Stress fields of microstructures under uniaxial tension from a single coarsening simulation run with the particle volum fraction of about 0.7, having high (~0.6, left) and low contiguity (~0.25, right) of particles. the arrows indicate the direction of uniaxial tension$ 표 Stress fields of microstructures under uniaxial tension from a single coarsening simulation run with the particle volum fraction of about 0.7, having high (~0.6, left) and low contiguity (~0.25, right) of particles. the arrows indicate the direction of uniaxial tension
$Strain rate fields of microstructures under uniaxial tension from a single coarsening simulation run with the particle volume fraction of about 0.7, having high (~0.6, left) and low contiguity (0.25, right) of particles. The arrows indicate the direction of uniaxial tension$ 표 Strain rate fields of microstructures under uniaxial tension from a single coarsening simulation run with the particle volume fraction of about 0.7, having high (~0.6, left) and low contiguity (0.25, right) of particles. The arrows indicate the direction of uniaxial tension
$Results of stress fields from the property simulation on both the coarsened microstructure with the same particle volume fraction$ 표 Results of stress fields from the property simulation on both the coarsened microstructure with the same particle volume fraction
$Results of strain rate fields from the property simulation on both the coarsened microstructure with the same particle volume fraction$ 표 Results of strain rate fields from the property simulation on both the coarsened microstructure with the same particle volume fraction
$Contiguities of particles for SCGP, BCCGP, FCCGP microstructures. Contact between particles occurs at 51% volume fraction of particles for SCGP, 62% for BCCGP, and 68% for FCCGP. As the volume fraction of particles increases, the contiguity of particles increases regardless of the types of microstructures$ 표 Contiguities of particles for SCGP, BCCGP, FCCGP microstructures. Contact between particles occurs at 51% volume fraction of particles for SCGP, 62% for BCCGP, and 68% for FCCGP. As the volume fraction of particles increases, the contiguity of particles increases regardless of the types of microstructures
$Relative sustainment of each particle and matrix phase for SCGP, BCCGP, and FCCGP microstructures with volume fraction of particles$ 표 Relative sustainment of each particle and matrix phase for SCGP, BCCGP, and FCCGP microstructures with volume fraction of particles
$Relative activity of each particle and matrix phase for SCGP, BCCGP, and FCCGP microstructures with volume fraction of particles$ 표 Relative activity of each particle and matrix phase for SCGP, BCCGP, and FCCGP microstructures with volume fraction of particles
$Macroscopic average von Mises stress and average von Mises stress of each phase are represented at 10~90% volume fraction of particles for SCGP, BCCGP, and FCCGP microstructures$ 표 Macroscopic average von Mises stress and average von Mises stress of each phase are represented at 10~90% volume fraction of particles for SCGP, BCCGP, and FCCGP microstructures
$Macroscopic average strain-rate and average strain-rate of each phase are represented at 10~90% volume fraction of particles for SCGP, BCCGP, and FCCGP microstructures$ 표 Macroscopic average strain-rate and average strain-rate of each phase are represented at 10~90% volume fraction of particles for SCGP, BCCGP, and FCCGP microstructures
표 von Mises stress contour images for SCGP. 1st column is von Mises stress contour of both particle and matrix phases, and 2nd and 3rd columns are of each particle and matrix phase, respectively
표 von Mises stress contour images for BCCGP. 1st column is von Mises stress contour of both particle and matrix phases, and 2nd and 3rd columns are of each particle and matrix phase, respectively
표 von Mises stress contour images for FCCGP. 1st column is von Mises stress contour of both particle and matrix phases, and 2nd and 3rd columns are of each particle and matrix phase, respectively
$Matrix channel contour images for SCGP, BCCGP, and FCCGP microstructures at 50~90% volume fraction of particles$ 표 Matrix channel contour images for SCGP, BCCGP, and FCCGP microstructures at 50~90% volume fraction of particles
표 The cross sections of matrix channels for SCGP, BCCGP, and FCCGP microstructures

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