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한준희,황농문,김종집,문한규 ( J . H . Hahn,N . M . Hwang,J . J . Kim,H . G . Moon ) 한국열처리공학회 1989 熱處理工學會誌 Vol.2 No.2
In order to improve hardness uniformity of standard-hardness blocks, exprimental procedure was designed using Taguchi Method. For this purpose the following factors were studied : austenitizing temperature, tempering condition, grinding condition, subzero treatment, lapping time, 15㎛ polishing time, final polishing time. These factors were processed and then ten hardness values were measured on each specimen, SN (signal to noise) ratio for each condition was calculated with standard variations of these values. Finally, from the calculated value of ANOVA on SN ratios, the lapping time was found to be the main factor. Better uniformity with longer lapping time implies that residual stress that was formed after quenching is a dominent parameter that affects on the unformity of hardness. Therefore, step-quenching method was adapted to minimize the residual stress. By this modification of quenching procedure, the hardness uniformity was improved remarkably and the yield ratio was increased from 55% to 88%.
Nano-indentation 실험과 유한요소 해석을 연계한 재료의 탄소성 물성 평가법 개발
김윤재(Y.J Kim),송태광(T.K Song),박준협(J-H Park),한준희(J-H Hahn) 한국정밀공학회 2006 한국정밀공학회 학술발표대회 논문집 Vol.2006 No.5월
Determination of elastic properties of nano-scale materials using nano-indentation tests is well established, but that of plastic properties is not yet clear. This paper presents a method to extract plastic properties from nano-indentation test, together with results from detailed elastic-plastic FE analysis. It shows that the plastic properties determined from this method are not unique, in the sense that a number of different plastic properties can give the same load-displacement response from nano-indentation test. Possible ways to overcome such problems are discussed.
Anisotropic domain-wall dynamics in proton-irradiated KH2PO4
S.H. Kim,B.H. Oh,한준희,이철의,J.Y. Choi,K.D. Hahn,C.Y. Jang,윤부현,김준 한국물리학회 2009 Current Applied Physics Vol.9 No.6
KH2PO4 single crystals have been studied by employing complex impedance measurements in view of the domain freezing effect. As a result, distinct behaviors of the anisotropic domain-wall dynamics in the activation energy of domain freezing and the Vogel–Fulcher temperature before and after proton irradiation have been identified in the anisotropic crystal structure.