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고탄소 크롬강의 切削性에 미치는 機械的 性質 및 其他組織의 影響
陳載寬,金東健 전북대학교 공업기술연구소 1992 工學硏究 Vol.23 No.-
Machinability dependson tool material, working condition, capability of machine, lubricant and properties of workpiece. The property of workpiece and working conditions are very important for machinability. The purpose of this study is to investigate the effect of material properties on machinability in high carbon chromium steels. Test piece was made several types of microstructures and hardness with various spheroidization annealing condition. It is carried out at constant cutting condition with various material properties. Those results show that machinability is affected by only microstructure above 270HB, below RZ4. Also, tool life is increased with sulphur content.
회전접촉피로수명에 미치는 합금원소 및 침질탄화처리의 영향
진재관,김동건 ( Jai Koan Jin,Dong Keon Kim ) 한국열처리공학회 1994 熱處理工學會誌 Vol.7 No.4
This study has been carried out to evaluate effects of alloying elements and nitrocarburizing on rolling contact fatigue life. Manganese has a significant influence on the distribution of retained carbides and microstructural changes after rolling contact fatigue test. The effect of the manganese addition stabilized fine retained carbide particles during rolling contact fatigue life test, and so increased fatigue life markedly. High carbon chromium bearing steel with different matrixes were nitrocarburized by austenitic nitrocarburizing process at 850℃ for 4hrs. Rolling contact fatigue life of the nitrocarburized specimen was increased 2 times than full hardening treated.
고탄소 크롬 베어링 강에서의 잔류 오스테나이트 변화에 따른 회전접촉 피로거동
진재관,김동건 ( Jai Koan Jin,Dong Keon Kim ) 한국열처리공학회 1994 熱處理工學會誌 Vol.7 No.3
In order to study the effect of retained austenite on rolling contact fatigue in high-carbon chromium bearing steel, retained austenite was controlled by only tempering temperature, individually 200, 220 and 240℃. Among various microstructural alteration during rolling contact fatigue test, plate-like carbide most related to the flaking at sub-surface of contact pressure. The plate-like carbides formed during rolling contact fatigue test decrease with increasing tempering temperature, and fatigue life is much more improved. The retained austenite was decreased with the tempering temperature, and that decreased plate-like carbide formation. Therefore fatigue life is much more improved with decreasing retained austenite.