음향방출을 이용한 수소 유기 균열 환경에서 초고강도강(HV670)의 하한계응력확대계수의 결정
- Abstract
- In this study, elastic wave generated from HAC of SKD11 (HV670) specimen was detected and frequency characteristics by hydrogen aggregation and crack propagation were analyzed by time-frequency analysis method using LabVIEW. Low frequency bands below 40 kHZ and high frequency bands above 60 kHz were detected. Low frequencies below 40 kHZ are due to hydrogen agglomeration and corrosion, and high frequencies above 60 kHz are due to HAC. The crack propagation of the specimen was observed from the cumulative elastic wave and the fracture surface, and KIHAC was determined. This result is to provide basic data for the monitoring of a structures generating a Hydrogen-Assisted Cracking and can be predict the HAC behavior of UHSS. That is, the surface is , and the depth is .
- Issued Date
- 2020
- Awarded Date
- 2020. 8
- Type
- Dissertation
- Keyword
- Ultra-High Strength Steel (HV670) Threshold Stress Intensity Factor Hydrogen-Assisted Cracking(HAC) Acoustic Emission
- Publisher
- 부경대학교
- Affiliation
- 부경대학교 산업대학원
- Department
- 산업대학원 재료공학과
- Advisor
- 남기우
- Table Of Contents
- 1. 서론 1
2. 재료 및 실험방법 3
2.1 재료 및 시험편 3
2.2 실험 방법 5
3. 결과 및 고찰 7
3.1 Kc=8.11 MPa√m, Ka=5.56MPa√m의 균열 진전 7
3.2 Kc=3.02 MPa√m, Ka=2.07MPa√m의 균열 진전 14
3.3 Kc=2.86 MPa√m, Ka=1.96MPa√m의 균열 진전 21
4. 결론 29
References 30
감사의 글 35
- Degree
- Master
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음향방출을 이용한 수소 유기 균열 환경에서 초고강도강(HV670)의 하한계응력확대계수의 결정.pdf
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