Small-angle X-ray scattering investigation of the martensite unmixing in maraging alloy using synchrotron radiation

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Abstract
The unmixing of lath martensite in a maraging alloy at temperatures ranging from 348 to 458°C has been studied by small-angle X-ray scattering using synchrotron radiation. The scattering patterns were first analysed using a two-phase model which leads to the time evolution of the size and the volume fraction of the scattering spherical precipitates of the ω phase. The structure function was scaled independently of time. When another type of precipitation occurs simultaneously with that of the ω phase, the scaling behaviour is no longer followed. The scale length is the ω particle size which varies with time as t α with 0·217 ≤ α ≤0·270 depending on the temperature.