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X-Ray Diffraction
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Arex  
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  • AREX is a complete automated instrument for retained austenite measurement according to ASTM E 975 - 03.
  • Accurate measurement of the retained austenite content is important in the development and control of a heat treatment process.
  • X-Ray Diffraction (XRD) is the only method available that can accurately determine retained austenite contents down to 0.5 volume percent.
  • Quantitative determination of retained austenite content in heat-treated steels by x-ray diffractionhas provided a reliable means of controlling properties and ensuring quality.
  • Using “ASTM E 975-03 Standard Practice for X-ray Determination of Retained Austenite inSteel with Near Random Crystallographic Orientation” along with the ARE X, retained austeniteissues can be easily monitored and controlled.
  • Austenite, due to its structural difference from other phases in steel, produces a diffractionpeak at different locations than ferrite and martensite. The amount of a phase in steel ispropo rtional to the integrated intensity of its diffraction peak. In simple terms, the amount ofretained austenite can be correlated to the ratio of the integrated intensity of the austenitepeak to the integrated intensity of peaks associated with the other phases.
  • To characterize the concentration of retained austenite using XRD four diffraction peaks arecollected by the X-ray diffractometer, two for the ferrite/martensite phase and two for theaustenite phase. A comparison of the intensities of the 4 peaks yields the volume percentconcentration of retained austenite in the sample.
  • Features
    • In compliance with ASTM E 975 – 03
    • High stability X-ray generator through precision feedback control circuits
    • Automatic ramp of the high voltage and emission current to preset values
    • High power and brilliant glass and ceramic Mo X-ray tubes: 60 kV
    • High focussing mono-capillary collimator
    • 2? range: 27 to 40°
    • Sample holder: 110 mm x 150 mm
    • High resolution CCD fast detector
    • Acquisition time < 5 min
    • Radiation enclosure with double safety circuit
    • Calibration included

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