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Revealing austenite grain boundaries by thermal etching: advantages and. disadvantages

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Figure

Table 1. Chemical composition (% mass)
Table 2. Austenitisation conditions  Steel  Tγ (ºC)  tγ (s)  V  950, 1000, 1050, 1100, 1150, 1200, 1250  180, 300  Ti  950, 1000, 1050, 1100, 1150, 1200, 1225, 1250  180  TiV  950, 1000, 1050, 1100, 1150, 1200, 1250  60  Tγ is austenitisation temperature
Fig. 1. Groove formed at the intersection of a free surface with a grain boundary.
Fig. 2.- Characteristic steady-state profile of a thermal groove formed at a free-surface by a  moving grain boundary
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