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학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
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논문 기본 정보
- 자료유형
- 학위논문
- 저자정보
- 지도교수
- 조경목
- 발행연도
- 2017
- 저작권
- 부산대학교 논문은 저작권에 의해 보호받습니다.
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이 논문의 연구 히스토리 (4)
2020
2017
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초록· 키워드
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Stress-rupture parameter (SRP), an evaluation method of post weld heat treatment (PWHT) cracking susceptibility, was developed by the United States Steel Corporation. Values can be obtained by multiplying the rupture strength and reduction of cross sectional area for 10 minutes in Stress-rupture tests. It is known that this method is appropriate as an evaluation method of PWHT cracking susceptibility.
Therefore, this study aims to compare the performance by evaluating the PWHT cracking susceptibility using SRP in the weld heat-affected zone between Ti-added RAFM steel developed and studied in Korea.
On the basis of the SEM, TEM analysis Results of Stress rupture test, M23C6 carbide was precipitated along the lath boundary and prior austenite grain boundary, and MX carbide was precipitated from the inside of the grain. The carbide of the Ti-added RAFM steel was smaller than that of Mod-E97. The cracks occur along the prior austenite grain boundary and propagate with the development/combination of voids.
As a result of Stress rupture test, the Ti-added RAFM steel has lower rupture strength than Mod-E97, Mod-F82H but shows relatively higher than it. According to the results of SRP index, excellent ductility was shown on average.
Therefore, this study aims to compare the performance by evaluating the PWHT cracking susceptibility using SRP in the weld heat-affected zone between Ti-added RAFM steel developed and studied in Korea.
On the basis of the SEM, TEM analysis Results of Stress rupture test, M23C6 carbide was precipitated along the lath boundary and prior austenite grain boundary, and MX carbide was precipitated from the inside of the grain. The carbide of the Ti-added RAFM steel was smaller than that of Mod-E97. The cracks occur along the prior austenite grain boundary and propagate with the development/combination of voids.
As a result of Stress rupture test, the Ti-added RAFM steel has lower rupture strength than Mod-E97, Mod-F82H but shows relatively higher than it. According to the results of SRP index, excellent ductility was shown on average.
목차
제 1 장 서 론 1제 2 장 이론적 배경 42.1 핵융합로 42.2 핵융합로 블랑켓(Blanket) 82.2.1 후보 소재 82.2.2 저방사화강(RAFM Steel) 102.3 용접열영향부 특성 132.3.1 용접열영향부(HAZ, Heat Affected Zone) 132.3.1.1 CGHAZ (Coarse - grained Zone) 152.3.1.2 FGHAZ(Fine- grained Zone) 152.3.1.3 IGHAZ(Inter critically reheated Zone) 152.3.1.4 SCHAZ(Sub critically reheated Zone) 152.3.2 용접열영향부 미세조직 및 기계적성질 162.4 용접 후열처리 균열 182.4.1 용접 후열처리 균열 발생기구 192.4.2 평가방법 232.4.2.1 SRP 지수평가를 통한 후열처리 균열 감수성평가 232.4.2.2 단면적 감소율을 통한 후열처리 균열 감수성평가 23제 3 장 실험 방법 253.1 실험재료 및 용접변수 253.2 용접열영향부 재현 293.3 Stress rupture Test 323.4 미세조직 및 석출물 분석 32제 4 장 결과 및 고찰 334.1 모재 미세조직 334.2 용접열영향부 미세조직 384.3 Stress rupture Test 결과 404.4 SRP(Stress Rupture Parameter)지수 측정결과 및 균열 발생원인 분석 494.4.1 SRP 지수 측정결과 494.4.2 파단면 분석 544.4.3 각 합금의 입계 석출물 분석 574.4.4 PWHT 시간에 따른 석출물 분석 62제 5 장 결 론 67참고문헌 69Abstract 73
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