• Title/Summary/Keyword: X-ray diffraction

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Analysis of Rolling Contact Surface on PM-High Speed Steel by X-ray Diffraction (구름접촉을 하는 분말고속도공구강의 X선을 이용한 표면성상해석)

  • 이한영;김용진;배종수
    • Tribology and Lubricants
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    • v.19 no.1
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    • pp.1-8
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    • 2003
  • Recently, PM-high speed steel(PM-HSS) has reportedly been a good alternative material for rolling mill because of its superior performance to conventional HSS. This paper has been aimed to investigate the possibility for application to rolling contact element for PM-HSS by X-ray diffraction technique. The X-ray elastic constant for PH-HSS has been found by X-ray diffraction during the four-point bending test. Residual stress and half-value breadth on the contact surface during rolling contact fatigue process by X-ray diffraction have also been measured. The result of this study shows that the application of X-ray diffraction technique to PM-HSS could be as possible alternative material as conventional HSS. Half-value breadth on rolling contact surface by X-ray diffraction is not changed during rolling contact fatigue process. On the other hand, the residual stress is changed. This suggests that dislocation reaction has been hardly occurred in rolling contact, depending on super-saturated carbon in PM-HSS.

Analysis of Rolling Contact fatigue for PM-High Speed Steel by X-ray Diffraction (X선회절에 의한 분말 고속도공구강의 구름접촉피로 해석)

  • 이한영;노정균;배종수;김용진
    • Proceedings of the Korean Society of Tribologists and Lubrication Engineers Conference
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    • pp.44-49
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    • 2000
  • Recently, PM-high speed steel(PM-HSS) has reportedly been a good alternative material for rolling mill because of its superior peformance to conventional HSS. This paper has been aimed to investigate the possibility for application to rolling contact element for PM-HSS by X-ray diffraction technique. The X-ray elastic constant for PM-HSS has been found by X-ray diffraction during the four-point bending test. Residual stress and half-value breadth on the contact surface during rolling contact fatigue process by X-ray diffraction have also been measured. The result of this study shows that the application of X-ray diffraction technique to PM-HSS could be as possible alternative material as conventional HSS. Half-value breadth on rolling contact surface by X-ray diffraction is not changed during rolling contact fatigue process. On the other hand, the residual stress is changed. This suggests that dislocation reaction has been hardly occurred in rolling contact, depending on supersaturated carbon in PM-HSS.

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High pressure X-ray diffraction study on a graphite using Synchrotron Radiation (고압하에서 방사광을 이용한 흑연에 대한 연구)

  • Kim, Young-Ho;Na, Ki-Chang
    • The Journal of the Petrological Society of Korea
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    • v.3 no.1
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    • pp.34-40
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    • 1994
  • High pressure X-ray diffraction study was carried out on a graphite to investigate its compressibility as well as any possible phase transition to the hexagonal diamond structure at room temperature. Energy dispersive X-ray diffraction method was introduced using a Mao-Bell type diamond anvil cell with Synchrotron Radiation. Polycrystalline sodium chloride was compressed together with graphite for the high pressure determinations. Because of the poor resolution of the X-ray diffraction pattern of graphite, its compressibility was estimated to be almost same as that of NaCl by graphite (002) X-ray diffraction peak only. An observation of any new peak from a possible hexagonal diamond phase seems very unplausible for its definite identification based on the present data. Alternative approaches such as an Wiggler Radiation source as well as a Large Volume high pressure apparatus will be necessary for the detailed studies on a graphite in future.

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Quantitative Analysis of Mineral Composition in Porland Cement Clinker by X-ray Diffraction (포틀랜드 시멘트 클린커 광물조성의 X선구절에 의한 정량분석)

  • Chang, Se-Kyung;Rhee, Jhun;Han, Ki-Sung
    • Journal of the Korean Ceramic Society
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    • v.23 no.2
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    • pp.64-70
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    • 1986
  • In this investigation x-ray diffraction method was mainly studied for quantitative analysis of clinker mineral composition. And also optical microscopic observation and Bogue calculation method were applied to compare with the x-ray diffraction method. In the procedure of x-ray diffraction analysis graphite monochromator automatic divergence slit and spinner for sample holder were used for minimizing the error due to the operation of the equipment. Especially the separation of overlapped peaks were proceeded by micro-processor automatically. The results of x-ray diffraction method for synthesized clinker were consistent with the Bogue value and the results of optical microscopic observation. However the results of quantitative analysis of mineral composition or commercial clinker containing solid solution of minor component were different from the Bogue value. On the other hand they agreed reasonably well with results of the optical mic-roscopic observation.

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Evaluation of Thermal Degradation of 2.25Cr-1Mo Steel Using Ultrasonic Nonlinear Effect and X-ray Diffraction Method (초음파 비선형 음향 효과 및 X-선 회절법을 이용한 2.25Cr-1Mo 강의 열화 손상 평가)

  • Kim, Duk-Hee;Park, Un-Su;Park, Ik-Keun;Byeon, Jai-Won;Kwun, Sook-In
    • Journal of the Korean Society of Safety
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    • v.17 no.4
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    • pp.71-79
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    • 2002
  • It was attempted to evaluate the degree of degradation of thermally aged 2.25-1Mo steek by ultrasonic monlinear parameter(UNP) measurement and X-ray diffraction analysis of extracted carbide. Artificial aging was performed to simulate the microstructural degradation in 2.25Cr-1Mo steel arising from long time exposure at $540{\circ}C$. Microstructural analysis (number of carbides per unit area) and measurements of mechanical properties(Vickers hardness, DBTT) and degradation evaluation parameters(UNP and intensity ration of X-ray diffraction peak of electrolytically extracted carbide) were performed. Both of UNP and intensity ratio of X-ray diffraction peak for M6C carbide to that of M23C6 carbide(IR) increased abruptly in the initial 1000 hour of aging and then changed little. UNP and IR were proposed as potential parameters to evaluate the degree of aging degradation of 2.25Cr-1Mo steel.

High Pressure X-Ray Diffraction Study on a Goethite using Synchrotron Radiation (방사광을 이용한 괴타이트에 대한 고압 X-선 회절연구)

  • 김영호;이지은
    • Journal of the Mineralogical Society of Korea
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    • v.10 no.2
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    • pp.75-81
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    • 1997
  • High pressure X-ray diffraction study was carried out on a natural FeO(OH)-goethite to investigate its compressibility at room temperature. Energy dispersive X-ray diffraction method was employed using Mao-Bell type diamond anvil cell with Synchrotron Radiation. MgO powder was compressed together with goethite for the high pressure determinations. Bulk modullus was determined to be 147.9 GPa by the Birch-Murnaghan equation of state under assumption of K0' of 4. This value was subjected to compare with its structural analogs and related materials.

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Preparation of Epitaxial $LaSrCoO_3/SrTiO_3(100)$ Structures by The Chemical Solution Process (화학적 용액법에 의한 에피탁샬 $LaSrCoO_3/SrTiO_3(100)$ 구조의 제조)

  • 이형민;황규석;송종은;류현욱;강보안;윤연흠;김병훈
    • Journal of the Korean Ceramic Society
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    • v.36 no.10
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    • pp.1075-1079
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    • 1999
  • LaSrCoO3 thin films were spin-coated onto the SrTiO3(100) substrates by the chemical solution process. X-ray diffraction $\theta$-2$\theta$ scans and X-ray diffraction $\beta$ scans were used to determine the crystallinity and in -plane alignment behavior of the films. The X-ray diffraction pattern showed the film obtained by annealing at 80$0^{\circ}C$ was highly oriented. The X-ray diffraction pole-figure analysis and reciprocal-space mapping (2$\theta$-$\Delta$$\omega$ scans) of the resulting film showed that the film comprising the pseduocubic phase had an epitaxial relationship with the SriO3 substrate.

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Assessment of Fatigue Life for Pipeline Welds Using X-ray Diffraction Method (X선 회절을 이용한 배관용접부의 피로수명 평가)

  • Lee, Sang-Guk;Yu, Geun-Bong;Kim, Ui-Hyeon;Choe, Hyeon-Seon
    • Proceedings of the KWS Conference
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    • pp.73-75
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    • 2005
  • The objective of this study is to estimate the feasibility of X-ray diffraction method application for fatigue life assessment of the high-temperature pipeline steel such as main steam pipe, reheater pipe and header etc. in power plant. In this study, X-ray diffraction tests using various types of specimen simulated low cycle fatigue damage were performed in order to analyze fatigue properties when fatigue damage conditions become various stages such as 1/4, 1/2 and 3/4 of fatigue life, respectively. As a result of X-ray diffraction tests for specimens simulated fatigue damages, we conformed that the variation of the full width at half maximum intensity decreased in proportion to the increase of fatigue life ratio.

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An Study on the Structure of Maghemite(${\gamma}$-Fe$_2$O$_3$) I -Rietveld Analysis of Powder XRD Patterns- (마게마이트(${\gamma}$-Fe$_2$O$_3$)대한 연구 I -분말 X-선 회절무늬의 Rietveld 분석-)

  • 신형섭
    • Journal of the Korean Ceramic Society
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    • v.35 no.10
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    • pp.1113-1119
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    • 1998
  • Crystal structure of needle-shaped maghemite(${\gamma}$-{{{{ { {Fe }_{2 }O }_{3 } }}) has been studied by the Rieveld analysis of powder X-ray diffraction patterns. The tetragonal space group P41,.3212 and cubic space group P41,.32 have been have been used for the refinement of X-ray diffraction patterns. The crystal system of maghemite is closed to tetragonal more than cubic. The tetragonal lattice parameters are a=8.3460$\AA$ and c=25.034$\AA$ The standard X-ray diffraction pattern of the tetragonal maghemite analyzed with space group P41,.3212 is proposed.

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Studies on Nanostructured Amorphous Carbon by X-ray Diffraction and Small Angle X-ray Scattering

  • Dasgupta, K.;Krishna, P.S.R.;Chitra, R.;Sathiyamoorth, D.
    • Carbon letters
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    • v.4 no.1
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    • pp.10-13
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    • 2003
  • The structural studies of amorphous isotropic carbon prepared from pyrolysis of phenol formaldehyde resin have been carried out using X-ray diffraction. X-ray diffraction from as prepared sample at $1000^{\circ}C$ and a sample treated at $1900^{\circ}C$ revealed that both are amorphous even though there are small differences in short range order. It is found that both are graphite like carbon (GLC) with predominantly $sp^2$ hybridization. Small angle X-ray scattering results show that as prepared sample mainly consists of thin two dimensional platelets of graphitic carbon whereas they grow in thickness to become three dimensional materials of nano dimensions.

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