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13Cr 마르텐사이트계 스테인리스강의 기계적성질에 미치는 Mo 첨가의 영향
김기엽,정병호,김무길,박찬,안용식 ( Ki Yeob Kim,Byung Ho Jung,Mu Gil Kim,Chan Park,Yong Sik Ahn ) 한국열처리공학회 1998 熱處理工學會誌 Vol.11 No.3
N/A 13%Cr martensitic stainless steel was microalloyed with 0∼1.5%Mo, and the mechanical properties were tested at the various heat treated conditions. Mo addition increased austenitization temperature(Ac1), and had little influence on the hardness and tensile properties at the annealed condition. The higher the austenitizing temperature, the higher the hardness and tensile strength, but Mo addition decreased those properties. The impact energy after austenitization increased with addition of Mo. The decrease of mechanical properties and increase of impact energy of Mo-alloyed steel after austenitization are thought to be caused by formation of ductile δ-ferrite phase in the microstructure.
Nb/Fe-C-(Si) 주조접합재에서 등온열처리시 계면반응층의 성장에 관한 연구
정병호 ( Jeong Byeong Ho ),김무길 ( Kim Mu Gil ),정상훈 ( Jeong Sang Hun ),박홍일 ( Park Hong Il ),안용식 ( An Yong Sig ),이성열 ( Lee Seong Yeol ) 한국열처리공학회 2003 熱處理工學會誌 Vol.16 No.5
N/A In order to study the interfacial reaction between Nb thin sheet and Fe-C-(Si) alloy with different chemical compositions, they were case-bonded. The growth of carbide layer formed at the interface after isothermal heat treatment at 1173K, 1223K, 1273K and 1323K for various times was investigated. The carbide formed at the interface was NbC and the thickness of NbC layer was increased linearly in proportional to the heat treating time. Therefore, It was found that the growth of NbC layer was controlled by the interfacial reaction. The growth rate constant of NbC layer was slightly increased with increase of carbon content when the silicon content is similar in the cast irons. However, as silicon content increases with no great difference in carbon content, the growth of NbC layer was greatly retarded. The calculated activation energy for the growth of NbC layer was varied in the range of 447.4-549.3kJ/㏖ with the compositions of cast irons.
420J2 스테인리스강의 내식성에 미치는 저온 템퍼링의 영향
정병호 ( Jeong Byeong Ho ),김헌주 ( Kim Heon Ju ),김무길 ( Kim Mu Gil ),오이식 ( O I Sig ),김동섭 ( Kim Dong Seob ) 한국열처리공학회 2004 熱處理工學會誌 Vol.17 No.1
N/A The effect of low tempering in a temperature range of 150-400℃ on corrosion resistance in 42OJ2 stainless steel austenitized at 1000℃ was investigated by the application of salt spray test, electrochemical pitting test in 3.5% NaCl solution and DL-EPR test for intergranular corrosion in 0.5M H₂SO₄+0.01 M KSCN solution. In salt spray test, good corrosion resistance was obtained in a tempering temperature range of 150-250℃. Pitting potential was increased to the tempering temperature of 250℃, but decreased with the increase of temperature up to 400℃ And it was thought that the degradation of pitting corrosion resistance showed at the tempering temperature of around 400 C was due to the precipitation of Cr^(7)C₃of M^(7)C₃ type. The degree of sensitization showed increasing tendency with the increase of tempering temperature, and also Cr depletion phenomena were observed in the vicinity of grain boundary.