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자동차 부품 정밀가공면의 소성스트레인 측정을 위한 새로운 기법의 개발
김태영(T. Y. Kim),반야풍(Y. Iino),문상돈(S. D. Mun) 한국자동차공학회 1996 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1996 No.6_2
Metal cutting leaves a plastically deformed layer in the precision machined surface in motor parts, such as torsion beam, rear axle and hole of engin piston. This residual phenomenon affects in various forms the physical properties of machined components such as the fatigue strength. the dimensional instability, microcracks and the stress corrosion cracking. There is an alternative way to determine the residual strain in plastically deformed materials by measuring the plastically deformed layer after a subsequent recrystallization process.<br/> The purpose of this investigation is to explore a new technique for measuring plastic strain in machining applications, and in particular, to find the effect of cutting parameters, on the plastic strains in motor parts.<br/>
슈퍼 오스테나이트 스테인리스강의 열화손상에 대한 비파괴적 평가
권일현,백승세,유효선,Kwon, Il-Hyun,Baek, Seung-Se,Iino, Y.,Yu, Hyo-Sun 대한기계학회 2002 大韓機械學會論文集A Vol.26 No.7
This research was undertaken to clarify effects of thermal aging on electrochemical and mechanical properties of superaustenitic stainless steel and to detect the material degradation nondestructively. The steel was artificially aged at $300{\sim}650^{\circ}C$ for $240{\sim}10,000h$ and the mechanical properties were investigated at $-196{\sim}650^{\circ}C$ using small punch(SP) test. Also, the change in electrochemical properties caused by effects of thermal aging on superaustenitic stainless steel was investigated using electrochemical anodic polarization test in a KOH electrolyte. Carbides and ${\eta}-phase(Fe_2Mo)$ precipitated in the grain boundaries seem to deteriorate the mechanical properties by decreasing cohesive strength in the grain boundaries and to promote the current density observed in electrochemical polarization curves, The electrochemical and mechanical properties of superaustenitic stainless steel decreased significantly in the specimen aged at $650^{\circ}C$ corresponding to the sensitization temperature for conventional austenitic stainless steels.
질소처리된 슈퍼오스테나이트 스테인리스강의 시효손상 평가
권일현(Il-Hyun Kwon),이송인(Song-In Lee),백승세(Seung-Se Baek),Y. Iino,유효선(Hyo-Sun Yu) 대한기계학회 2001 대한기계학회 춘추학술대회 Vol.2001 No.8
To ensure the structural integrity and design life-time of the superaustenitic stainless steel containing 0.17wt% N and 5.5wt% Mo induced by artificially thermal aging treatment, material damage evaluation of the superaustenitic stainless steel was conducted by small punch (SP) and electrochemical polarization technique. The material damage in high-temperature and short-time aged material was higher than that in low-temperature and long-time aged material. A reasonable agreement was found between the results obtained from small punch and electrochemical polarization tests, depending on SP energy and the current density corresponding to the passivation film formation.