M. Sozanska et al., Use of quantitative metallography in the evaluation of hydrogen action during martensitic transformations, MAT SCI E A, 275, 1999, pp. 485-490
Experiments based on image analysis method and electrochemical potentiostat
ic tests were performed with particular attention to the influence of hydro
gen on the stabilisation of austenite of Fe-32 wt.%Ni alloy. This alloy exh
ibits great hydrogen absorption capacity (25 wt. ppm) and this presence mod
ifies the martensitic transformation essentially at temperatures near M-S (
-40 degrees C). In the whole range of the quenching temperatures, the diffe
rence between the volume fraction of martensite, measured on specimens with
hydrogen or without hydrogen, is constant. It was found that the value of
the interfacial area of the martensite plate groups S-V is the best paramet
er describing the interfacial area between martensite and austenite. It was
also found that there is a general relationship, expressed by a linear fun
ction, between this morphological parameter and an anodic current I. (C) 19
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