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구조용 압연강재와 스테인리스 강재의 MIG 용접에 대한 기계적 특성연구
임종영(J. Y. Lim),윤명진(M. J. Yoon),김상윤(S. Y. Kim),김태규(T. G. Kim) 한국기계가공학회 2014 한국기계가공학회지 Vol.13 No.1
It is well known that fatigue failures occur on welded structures in industrial application due to repetitive load force. In order to decrease the incidence of fatigue failure, we analyzed the mechanical properties based on structural aspects in rolled steel(SS 400) welded onto stainless steel (STS 304) by the MIG welding method as well as the structure of rolled steel welded onto itself. We compared the hardness, tensile and fatigue properties with two types of samples which had no defects on the welding parts as observed by X-ray topographic analysis. It was found that the tensile and fatigue strength levels of SS 400 welded onto STS 304 by the MIG welding methodwere higher than those of STS 304 welded onto itself.
Zinc Ferrite의 生成機構에 관한 硏究(第一報)
吳伊植,尹明鎭 釜山工業大學校 1981 論文集 Vol.22 No.2
To determine the mechnism by which zinc ferrite forms when ferrous zinc sulphide ore is roasted, the experiment has been carried out under given conditions by sufficiently mixing zinc oxides with ferric oxide in mole ratio (ZnO/Fe₂O₃=1) way. The resluts obatined from this experiment are summarized as follows; (1) Formation of zinc ferrite was not comfirmed by D.T.A thermal analysis property. (2) Formation of zinc ferrite was confirmed by X-ray diffraction analysis in formed compound at alternation of various temperature and it was greatly formed increased temperature, 1.e, zinc ferrite was not confirmed at less than 700℃, but was found at above 700℃, (3) Zinc leaching rate of synthetic zinc ferrite on sulphuric acid solution was similiar at low temperature (680℃), but decreased at above 700℃.