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Austenitic heat resistant steel STR35 for exhaust valves of automobile engines have good heat resistibility as well as oxidation due to precipitation hardening and its chemical composition. The hardness in STR35 is increasing with aging time, reaching...
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https://www.riss.kr/link?id=T14055546
- 저자
-
발행사항
대전: 忠南大學校 에너지科學技術大學院, 2016
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학위논문사항
학위논문(석사) -- 忠南大學校 에너지科學技術大學院 , 에너지과학기술학과 新에너지素材 전공 , 2016. 2
-
발행연도
2016
-
작성언어
한국어
-
DDC
333.79 판사항(22)
-
발행국(도시)
대전
-
기타서명
Microstructure and mechanical properties of high nitrogen austenitic Cr-Mn-Ni-N stainless steel
-
형태사항
58 p.: 삽화; 26 cm.
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일반주기명
충남대학교 논문은 저작권에 의해 보호받습니다.
지도교수: 홍순익
참고문헌 : p. 54-56 -
소장기관
- 충남대학교 도서관
- 충남대학교 도서관
-
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부가정보
다국어 초록 (Multilingual Abstract)
Austenitic heat resistant steel STR35 for exhaust valves of automobile engines have good heat resistibility as well as oxidation due to precipitation hardening and its chemical composition. The hardness in STR35 is increasing with aging time, reaching a maximum, followed by the hardness decrease on overaging. M23C6 carbides are initially precipitated while M23C6 and M6C carbides with aging time, and elogation and reduction of area are decreasing.
In this study, Hot compression test in the temperature range of 750~1250ㅇC and strain rate of 5mm/sec, 20mm/sec and 100mm/sec. The shape of flow stress curves indicated that the softneing was promoted by dynamic recovery followed by dynamic recrystallization whit high level of recovery. The microstructure evolution indicated that even though after large straining as that of the steady state stresses a combination of strained and recrystallized grains was observed.
In this study, Hot compression test in the temperature range of 750~1250ㅇC and strain rate of 5mm/sec, 20mm/sec and 100mm/sec. The shape of flow stress curves indicated that the softneing was promoted by dynamic recovery followed by dynamic recrystallization whit high level of recovery. The microstructure evolution indicated that even though after large straining as that of the steady state stresses a combination of strained and recrystallized grains was observed.
Austenitic heat resistant steel STR35 for exhaust valves of automobile engines have good heat resistibility as well as oxidation due to precipitation hardening and its chemical composition. The hardness in STR35 is increasing with aging time, reaching a maximum, followed by the hardness decrease on overaging. M23C6 carbides are initially precipitated while M23C6 and M6C carbides with aging time, and elogation and reduction of area are decreasing.
In this study, Hot compression test in the temperature range of 750~1250ㅇC and strain rate of 5mm/sec, 20mm/sec and 100mm/sec. The shape of flow stress curves indicated that the softneing was promoted by dynamic recovery followed by dynamic recrystallization whit high level of recovery. The microstructure evolution indicated that even though after large straining as that of the steady state stresses a combination of strained and recrystallized grains was observed.
목차 (Table of Contents)
- 제 1장 서론 1
- 제 2장 이론적 배경 2
- 제 1 절 자동차 밸브용 내열강 2
- 제 2 절 석출경화 열처리 9
- 제 3 절 회복과 재결정 13
- 제 1장 서론 1
- 제 2장 이론적 배경 2
- 제 1 절 자동차 밸브용 내열강 2
- 제 2 절 석출경화 열처리 9
- 제 3 절 회복과 재결정 13
- 제 3장 실험방법 21
- 제 1절 시편준비 및 실험 방법 21
- 제 4장 결과 및 고찰 24
- 제 1절 미세조직 분석 24
- 제 2절 기계적 특성 분석 32
- 제 3절 OM 분석 42
- 제 4절 결론 53
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