The effect of annealing on the paramagnetic and ferromagnetic phases of tempered tool steel was studied by Mössbauer spectroscopy as a function of the annealing parameter. The quantity of the paramagnetic materials first decreased due to the decomposition of austenite. After the minimum, the percentage of iron atoms contributing to the paramagnetic phases increased again showing the precipitation of paramagnetic carbides. In the ferromagnetic α-phase the alloying element concentration decreased monotonically with the annealing parameter.
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