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논문 기본 정보
- 자료유형
- 학위논문
- 저자정보
- 발행연도
- 2020
- 저작권
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Advanced ultra-supercritical power(A-USC) plants operates at a pressure of 35 MPa at 700 °C. Thus, the material used in the A-USC power generation system are Ni superalloy and high Cr ferritic steel having high creep strength and oxidation resistance. This study presents experimental analysis of the distribution of microstructural factors such as precipitate size, precipitate fraction, grain size and dislocation density in the heat-affected zone (HAZ) and base metal (BM) of the martensitic heat-resistant steel. P92 steel was divided into four zone, coarse grain heat affected zone (CGHAZ), fine grain affected zone I (FGHAZ I), FGHAZ II and BM. In order to understanding the effect of precipitation hardening in each area was quantitatively analysis using energy dispersive spectrometer (EDS) in the transmission electron microscopy (TEM) and field emission scanning electron microscope (FE-SEM). Also in order to understanding the effect of grain size and - 8 -dislocation density in each area used electron back scattered diffraction (EBSD). After that, the IN740H / P92 dissimilar welds that were post-heated at 760 °C for 2 hours were subjected to an accelerated creep test at 130 MPa of 625 °C. During the creep test, an optical microscope (OM) is used to analyze microstructure changes, and a field emission scanning electron microscope (FE-SEM) was used to
analyze the evolution of cavity during creep deformation. EBSD (electron back scattered diffraction) technique was used to analyze the grain size, recrystallization fraction, and density of geometrically necessary dislocation (GND). Vickers hardness testers were used to evaluate changes in mechanical properties during creep testing.
analyze the evolution of cavity during creep deformation. EBSD (electron back scattered diffraction) technique was used to analyze the grain size, recrystallization fraction, and density of geometrically necessary dislocation (GND). Vickers hardness testers were used to evaluate changes in mechanical properties during creep testing.
목차
1. 서론 12. 이론적 배경 42.1. 크리프 변형 42.2. 크리프 변형 기구 72.3. GND(geometrically necessary dislocation) 103. 실험 및 계산방법 133.1. 용접 방법 및 PWHT 133.2. 용접 시편의 미세조직 및 기계적 특성 분석 163.3. 크리프 변형 중 미세조직 및 경도 변화 204. 결과 및 고찰 234.1. PWHT 조건에 따른 미세조직 변화 234.2. PWHT 조건에 따른 기계적 특성 변화 314.3 크리프 변형 시 미세조직 변화 344.4 IN740H/P92 이종용접부 크리프 파단기구 425. 결론 476. Reference 5
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