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강창윤 대한용접접합학회 1990 대한용접·접합학회지 Vol.8 No.4
최근 항공우주산업, 원자력산업, 석유화학산업 등의 산업분야에 있어서는 각종 기기의 사용환경이 더욱 가혹하게 되고, 내열기능성이나 내식기능성이 특히 우수한 내열합금의 개발이 강하게 요구되고 있다. 이와 같은 요청에 대응하기 위해서 결정제어합금이나 입자분산강화합금, 섬유분산강화합금 등이 개발되고 있다. 내열합금을 사용하여 각종의 기기를 제조하는 경우에는 고성능, 고정도의 용접, 접합기술이 필요불가결하게 된다. 본 보고에서는 내열합금 중에서도 초내열합금에 초점을 두어 그 용접, 접합법으로서 주로 용접법과 확산접합법에 대한 최근의 연구동향에 대해서 기술한다.
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열분석법에 의한 Cu 를 함유한 HSLA 강의 시효 거동에 관한 연구
박태원,김영우,심인옥,강창윤 대한금속재료학회(대한금속학회) 1995 대한금속·재료학회지 Vol.33 No.1
The aging behavior of Cu-bearing HSLA steels was studied by using differential scanning calorimetry (DSC), transmission electron microscopy and hardness tester. Two heat evolution peaks were observed during DSC scans over the temperature range of 25∼590℃ at a heating rate of 5℃/min. The peaks appeared in low(241∼319℃ : HSLA-A, 224∼310℃ : HSLA-B) and high temperature (514℃∼ 590℃ : HSLA-A, 451∼558℃ : HSLA-B) are attributed to the formation of coherent Cu-clusters and noncoherent ε-Cu phase, respectively. And at a rapid heating rate over 7.5℃/min, another peak between these two peaks was observed in the temperature range of 300∼370℃. This peak is conjectured to be due to the formation of 9R martensite structures proposed by Othen et al. It will be necessary further research to identify this peak clearly. It was confirmed that as aging proceeds, the coherent bcc Cu-clusters transform to noncoherent fcc ε-Cu phase. In the case of the aging to peak hardness at 300℃ and 400℃, the coherent Cu-clusters contributed to the hardening. As aging time and temperature increase over peak hardness, noncoherent ε-Cu are formed and hardness decreases. The activation energy due to the formation of coherent bcc Cu-clusters in HSLA-B steel is 55㎉/mole. And those due to the formation of nonchorent ε-Cu phase in HSLA-A and HSLA-B steels are 59㎉/mole and 51㎉/mole, respectively. These are similiar to the activation energy(58㎉/mole) for the solute diffusion of Cu in α-Fe.
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김동진,김정태,김병훈,강창윤 대한금속재료학회(대한금속학회) 2000 대한금속·재료학회지 Vol.38 No.10
The impact properties of high tensile strength 3Cr-1Mo-V steel were studied in relation to the cooling rate on continuous cooling after austenitization and the effective grain size. The effective grain size is defined as the parallel lath packet and/or the region which cleavage cracks propagate through in a nearly straight fashion. From the experiment it was found that fracture appearance transition temperature(FATT) of 3Cr-1Mo-V steel was linearly correlated with the inverse square root of the mean effective grain size, d^(-½). The mean effective grain size became finer as the cooling rate increased and the linear relation between d^(-½) and logarithm of the cooling rate was obtained. From the above results, dependence of FATT on the cooling rates could be expected by the following equation : FATT(℃) = -41.21·log υ + 16.58, where υ is cooling rate from 800 to 400℃ in ℃/min, 16.58 is constant which related with the mean effective grain size.
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