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백운봉,윤기봉,서창민,이해무,Baek, Un-Bong,Yun, Gi-Bong,Seo, Chang-Min,Lee, Hae-Mu 대한기계학회 2000 大韓機械學會論文集A Vol.24 No.12
High temperature material properties of a welded joint were experimentally studied. Tensile and creep properties were measured for each part of weld metal. HAZ(heat affected zone) and parent metal at 538$^{\circ}C$. HAZ metal was obtained by a simulated heat treatment. Results showed that the order of tensile strength is weld>HAZ> parent both at 24$^{\circ}C$ and at 538$^{\circ}C$. Creep resistance was also the highest for weld metal and lowest for parent metal. Creep rupture life curves were obtained and converted to Monkman-Grant relation which is useful for life assessment. Use of the data obtained in this study is discussed.
스테인리스강 316L 배관의 End Grain Attack과 피트부식 손상진단
백운봉 ( Un Bong Baek ),최병학 ( Byung Hak Choe ),이진희 ( Jin Hee Lee ),심종헌 ( Jong Hun Shim ),김의수 ( Eui Soo Kim ),남승훈 ( Sung Hoon Nam ) 대한금속재료학회(구 대한금속학회) 2015 대한금속·재료학회지 Vol.53 No.1
The aim of this paper was to analyze the cause of surface cracks and pit corrosion on 316L pipe. An End Grain Attack (EGA) as a kind of pit mechanism was conducted on the pipe surface. The early stage of the EGA may come from under-deposit of caustic-water formation compositions like Na+, K+, Ca+, and Mg+ etc. The under-deposit corrosion is caused by the corrosion layer on the pipe surface followed by crevice corrosion due to accumulation of Cl-or S-composition between the corrosion layer and the pipe surface. In the early stage, the EGA occurred in all grain boundaries beneath the under-deposit corrosion. In the later stage of EGA, almost all the early attacked grain boundaries stopped at a limited depth of about 10 μm. Meanwhile, only the smallest number of the attacked boundaries progressed into the pipe as pit corrosion and resulted in leak failure. (Received February 24, 2014)
백운봉(Baek Un Bong),이해무(Lee Hae Moo),이윤희(Lee Yun Hee),남승훈(Nahm Seung Hoon) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.5
In this study. Low cycle fatigue properties were experimentally measured for 9Cr-1Mo steel. This test data will using design and life assessment for fossile power plant boiler head and steam pipes. Low cycle fatigue test performed at room temperature and high temperature(design temperature). Temperature effect for low cycle fatigue is discussed in detail. Standardization performed that the temperature calibration method for high temperature low cycle fatigue. The measured Reversals to failure vs true strain amplitude curve for the 9Cr-lMo steel at room temperature as shown in Fig. 1.
용접부 균열의 크리프-피로 균열성장 수명평가 연구 (Ⅰ)
백운봉(Un Bong Baek),윤기봉(Kee Bong Yoon),서창민(Chang Min Suh),이해무(Hae Moo Lee) 대한기계학회 2001 대한기계학회 춘추학술대회 Vol.2001 No.3
High temperature material properties of a welded joint were experimentally studied. Tensile and creep properties were measured for each part of weld metal, HAZ(heat affected zone) and parent metal at 538℃. HAZ metal was obtained by a simulated heat treatment. Results showed that the order of tensile strength is weld>HAZ>parent both at 24℃ and at 538℃. Creep resistance was also the highest for weld metal and lowest for parent metal. Creep rupture life curves were obtained and converted to Monkman-Grant relation which is useful for life assessment. Use of the data obtained in this study is discussed.