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Fe-4Cr-o.4C강에 있어서 마르텐사이트조직에 관한 연구
원상백 대한금속재료학회(대한금속학회) 1981 대한금속·재료학회지 Vol.19 No.2
Morphology, dependence of prior austenite grain size and packet size upon austenitizing temperature, distribution of lath width, and habit plane of martensitic structure in Fe-4Cr-0.4C steel has been studied by optical microscopy and transmission electron microscopy. The results obtained are as follows. 1) Optical microstructures of martensitic Fe-4Cr-0.4C steel consist of lath martensite and lens martensite. Also the four types of morphology are observed by electron microscopy. The most common morphologies are a regular paralleled martensite and an irregular dovetailed lath martensite, while the remainder of microstructures consists mainly of groups of internally twinned martensite and autotempered laths. 2) Prior austenite grain size and packet size, increased with austenizing temperature, and also the numbers of lath contained in a prior austenite grain or a packet are increased with austenizing temperature. 3) The mean width of lath in Fe-4Cr-0.4C steel is about 0. 23㎛ and most of lath widths are below 0.5㎛. 4) Martensite habit plane of Fe-4Cr-0.4C steel is nearly {110}α'
페라이트-마르텐사이트 복합조직강의 결정입 미세화에 미치는 Si 첨가의 영향
원상백,배동수 대한금속재료학회(대한금속학회) 1987 대한금속·재료학회지 Vol.25 No.10
In order to clarify the effects of small addition of silicon content on the grain size refinement in ferrite-martensite duplex steel, the average grain size, distribution of martensite phase and mechanical properties of this steel were investigated in this work. The results obtained are as follows; 1. The average grain size of the duplex steel containing Si below 0.2 wt% decreases with increasing Si content but the duplex steels exhibit different effects of grain size refinement depending upon the types of heat treatment cycle. 2. The duplex steel containing 0.1 wt% Si has the finest grain size (about 1 ㎛), and exhibits excellent mechanical properties (260 MPa yield strength, 640 MPa tensile strength, 28% total elongation and 25% uniform elongation). 3. The finer the starting structure, the finer the grain size of the duplex steel. 4. The grain size of the duplex steel decreases with increasing intercritical annealing temperature for a given holding time.
Fe-4Cr-0.4C 강의 마르텐사이트에 있어서 준안정탄화물의 석출 및 잔류오스테나이트의 분해에 관한 열분석적 연구
원상백 대한금속재료학회(대한금속학회) 1981 대한금속·재료학회지 Vol.19 No.9
The precipitation of metastable carbide and the decomposition of retained austenite in martensitic Fe-4Cr-O. 4C steel has been studied by micro-Vickers hardness test, transmission electron microscopy and calorimetry. The results obtained are as follows. 1) Under the argon atmosphere of 1.01×10^5 Pa, the relation between apparatus constant k of DSC used in this study and absolute temperature T gives the equation as k=1.419-9.198×10^(-4) T, where 323˚K≤T≤773˚K. 2) There are three exothermic peaks in DSC curve of martensitic Fe-4Cr-0.4C steel. The first peak corresponds to the precipitation of ξ-carbide in the first stage of tempering, the second to the decomposition of retained austenite in the second stage of tempering, and the third to the precipitation of cementite in the third stage of tempering. 3) Activation energies for the first stage and the second stage of tempering in martensitic Fe-4Cr-0.4C steel are 134.3KJ/㏖ and 153.6KJ/㏖, respectively. 4) The time indices for the first stage of tempering are determined to be 0.86 at 373˚K and 1.00 at 423˚K from the Johnson-Mehl's equation. 5) It is found that Differential Scanning Calorimetry is convenient to study the kinetics of carbide precipitation from the martensite.
Fe-Ni 2 원계합금에 있어서 매씨브변태에 관한 연구
원상백 대한금속재료학회(대한금속학회) 1984 대한금속·재료학회지 Vol.22 No.3
In order to discuss on the mechanism of massive transformation, the effect of the cooling rate on massive transformation start temperature, massive transformation peak temperature and massive transformation finish temperature, and the free energy change accompanied with massive transformation of Fe-Ni binary alloy, have been studied by means of Differential Thermal Analysis (DTA). The results obtained are as follows. 1) The λtype heat evolution attributed to massive transformation, has been observed in the DTA curve. Also, the serration of heat evolution has been observed in the DTA curie scanned below a certain cooling rate. It has been found that the mechanism of massive transformation has been explained by the occurance of serration in the heat evolution. 2) Massive transformation start temperature has been constant, independent on the cooling rate. However, massive transformation peak temperature and massive transformation finish temperature have decreased with the cooling rate, and its behavior has distinguished into the three region. 3) Massive transformation start temperature has decreased with Ni content in Fe-Ni binary alloy, however the free energy change accompanied with massive transformation has increased with Ni content in it. 4) Massive transformation has not occurred but maitensite transformation has occurred at a cooling rate below 2.5×10^(-1)˚K/s.
白鑄鐵에 있어서 加熱冷却處理가 黑영化 現象에 미치는 影響
김형자,원상백 國立釜山工業專門學校 1975 論文集 Vol.15 No.-
This study was attemped to research the effect of thermal cycling on graphitization in white cast iron. The results optained are summarized as follows. (1) The effect of thermal cycling on graphitization promoted the nucleation capacity and graphite growth. (2) The nucleation capacity and the graphite growth was increased with the number of thermal cycling. (3) The effect of themal cycling on graphitization was similar to it of stress.