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[論文] STS 420 스테인레스 강의 기계적 성질 및 피로균열전파에 미치는 템퍼링 온도의 영향
박용식(Y.S.Park),임병수(B.S.Lim) 한국자동차공학회 1992 오토저널 Vol.14 No.4
An experimental investigation has been carried out to determine the effect of tempering temperature on the fatigue crack propagation behavior and mechanical properties using the quenched and tempered STS420 martensitic stainless steel.<br/> Heat treatments of tempering for two hours at the five different temperatures of 150℃, 300℃, 450℃, 600℃ and 700℃ have been performed on the martensite obtained by air cooling the specimens austenitized for one hour at 1010℃. Tensile strength, yield strength, hardness, ?K_th. C and m values of differently tempered specimens have been investigated by tensile, hardness and fatigue tests.
SNCM220 강 권축의 침탄 열처리를 통한 피로 강도 개선에 관한 연구
이호성(H. S. Lee),임병수(B. S. Lim) 한국자동차공학회 1996 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1996 No.11_1
To find out the reason of fracture, specimens were made from the fractured winding shaft and the mechanical properties as well as their microstructures were investigated. Several heat treatments, including caburizing and tempering, were carried out to improve the microstructure, mechanical properties and rotating bending fatigue characteristics. Through these experiments, following conclusions were obtained, (1) Carburized and tempered specimens showed greatly improved mechanical properties including impact energy, hardness and strength. (2) The fatigue strength of the carburized and tempered specimens increased more than twice than that of the original fractured winding shaft.<br/>
[論文] SM45C강의 피로 균열 성장에 미치는 미세조직의 영향
김현철(H. C. Kim),임병수(B. S. Lim) 한국자동차공학회 1991 오토저널 Vol.13 No.2
To determine the effects of microstructure on the fatigue crack propagation behavior in SM45C steel, experimental investigations have been carried out with the specimens of different grain sizes and different spacings between the Fe₃C particles. Fatigue and tensile tests were conducted and the quantitative analysis of the relations between the threshold stress intensity range and grain size, interparticle spacing and yield stress were carried out. Some of the conclusions obtained are as fallows; (1) △Kth was observed to increase with grain size and the spacing between the Fe₃C particles. (2) In both pearlite and spheroidite microstructures, △Kth was increased when yield stress was decreased.
진공침탄한 SCM 415 강의 기계적 성질에 관한 연구
김대욱(D.W.Kim),이영제(Y.Z.Lee),임병수(B.S.Lim) 한국자동차공학회 1998 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1998 No.5_2
High cycle fatigue and dry wear characteristics of vaccum carburized low alloy steel, SCM415(0.149% C), were evaluated after various heat treatments including direct quenching, single reheat quenching and sub-zero treatment. Comparing the fatigue and wear characteristics of carburized specimens to those of hot annealed of reheat quenched specimens, the wear resistant property as well as bending fatigue limits of vacuum carburized steels were substantially superior to other heat treated steels. Test results indicated that the carburized and reheat treated specimens have higher fatigue limits than the carburized and direct-quenched specimens and the specimens followed by sub-zero treatment. The wear wolumes of sub-zero treated specimens with higher surface hardness show slightly lower values than those of non sub-zero treated specimens. This is attributed to the reduction of retained austenite amount of the surface and an increase of surface hardness by the sub-zero treatment effect.<br/>