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논문 기본 정보
- 자료유형
- 학위논문
- 저자정보
- 지도교수
- 안동규
- 발행연도
- 2016
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이 논문의 연구 히스토리 (4)
2015
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초록· 키워드
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The purpose of this study is to analyze characteristics of hardfacing layer with thermal stress control layer(TSCL). This study designed 4 type of finite element analysis(FEA) model to analyze heat transfer and thermal stress characteristics according to the material combination of TSCL, as well as the protruded height and the inclined angle TSCL. Materials of the hardfaced layer and the substrate were stellite 21 super alloy and STD 61 hot working tool steel, respectively. The TSCL was created by mixing of stellite 21 and STD 61. The inclined angle and protruded height of thermal stress control layer were 0o-90o and 0-2 mm, respectively. Heat transfer and thermal stress analyses were performed using a commercial software, ABAQUS V6.12. The material combination of TSCL was deduced through investing of temperature, stress distributions and strain distributions according to the material combination of TSCL. In addition, variation of temperature, stress and strain distributions in the hardfaced layer, TSCL and substrate according to the protruded height and the inclined angle of the TSCL were investigated.
In order to investigate the variation of the hardness according to the wear experiment at the elevated temperature, the hardness after the wear experiment was compared to that before the wear experiment. The friction induced work hardening(FIWH) was estimated to examine the work hardening ration via the wear experiment. In addition, wear characteristics, invlundy worn width, worn depth and the morphologies of worn region, were investing added using field emission scanning electron microscope(FE-SEM). The valuation of material composition in the thickness direction was observed using low vacuum scanning electron microscope(LV-SEM).
The impact resistance of the hardfaced specimen was investigated using the repeated drop impact test. From the results of the impact test, proper hardfacing material and the hardfacing thickness were estimated.
Based on the above results, proper the material combination and the design of TSCL as well as the material and the thickness of the hardfaced layer were obtained.
In order to investigate the variation of the hardness according to the wear experiment at the elevated temperature, the hardness after the wear experiment was compared to that before the wear experiment. The friction induced work hardening(FIWH) was estimated to examine the work hardening ration via the wear experiment. In addition, wear characteristics, invlundy worn width, worn depth and the morphologies of worn region, were investing added using field emission scanning electron microscope(FE-SEM). The valuation of material composition in the thickness direction was observed using low vacuum scanning electron microscope(LV-SEM).
The impact resistance of the hardfaced specimen was investigated using the repeated drop impact test. From the results of the impact test, proper hardfacing material and the hardfacing thickness were estimated.
Based on the above results, proper the material combination and the design of TSCL as well as the material and the thickness of the hardfaced layer were obtained.
목차
목 차List of Tables ············································································ⅲList of Figures ···········································································ⅳABSTRACT ···············································································ⅷ제 1 장 서론 ········································································1제 1 절 연구 배경 ·······························································1제 2 절 연구목적 및 방법 ·····················································2제 2 장 열응력 제어층에 대한 3 차원 유한요소 해석 ··············4제 1 절 열응력 제어층 3 차원 모델링 ····································4제 2 절 열응력 제어층 열전달/열응력 해석 방법 ·····················6제 3 장 열응력 제어층의 재료 혼합비에 따른 열전달/열응력 해석···7제 1 절 열응력 제어층의 재료 혼합비에 따른 온도 분포 특성 분석·······7제 2 절 열응력 제어층의 재료 혼합비에 따른 주변형률 분포 특성 분석···9제 3 절 열응력 제어층의 재료 혼합비에 따른 주응력 분포 특성 분석········11제 4 장 열응력 제어층의 돌출높이 및 형상각도에 따른 3 차원 유한요소 해석 결과 및 고찰 ·····················································14제 1 절 열응력 제어층의 돌출높이 및 형상각도에 따른 온도 분포 결과 및 고찰 ·······················································································14제 2 절 열응력 제어층의 돌출높이 및 형상각도에 따른 주응력 분포 결과 및 고찰 ·······················································································15제 3 절 열응력 제어층의 돌출높이 및 형상각도에 따른 주 변형률 분포 결과 및 고찰 ······································································17제 5 장 열응력 제어층의 재료 혼합비에 따른 경도/잔류응력 및 미세조직 특성 분석 ···································································20제 1 절 열응력 제어층의 재료 혼합비에 따른 고온 마모 시편 경도 시험 ···20제 2 절 열응력 제어층의 재료 혼합비에 따른 잔류 응력 특성 분석 ·····23제 3 절 열응력 제어층의 재료 혼합비에 따른 시편 조직 비교 ·················25제 4 절 열응력 제어층의 재료 혼합비에 따른 EDS (Energy ElectronMicroscopy) 성분 분석 ····································································35제 6 장 하드페이싱된 열간금형강 시편에 대한 충격 특성 분석 ·······37제 1 절 하드페이싱된 열간금형강 시편 제작 및 충격 실험·······················371. 하드페이싱된 열간금형강 시편 제작·········································372. 하드페이싱된 열간금형강 시편에 대한 충격 실험······················37제 2 절 하드페이싱된 열간금형강 시편에 대한 제작 특성 분석 ··········39제 3 절 반복 충격하중에 따른 하드페이싱층을 가진 열간금형강 시편 하중 및 외관 형상 특성 변화 분석······························································39제 4 절 반복 충격하중에 따른 적층 시편의 내부 균열/결함 특성 분석 ····41제 7 장 결론 ·······················································································42【References】······································································44감사의 글
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