roperties of the three P91 steels tested in this work are shown in Table 1. Note that hereon for brevity, the
as-received material is denoted ‘P91-A’. Of the two ex-service P91 steel materials tested, one was previously in
operation for over 110,000 hours at 590°C (denoted P91-B) and the other at 600°C for over 100,00 hours (denoted
P91-C). Metallographic analysis has been performed on the as-received material P91-A and the ex-service material
P91-B, as shown in Figure 1, where the materials was etched using Villela agent (containing 1g of picric acid, 5ml
of HCI and 100 ml of ethanol). Similar microstructures are seen in both as received and ex-service materials where
the expected lath martensite microstructure is observed
roperties of the three P91 steels tested in this work are shown in Table 1. Note that hereon for brevity, the as-received material is denoted ‘P91-A’. Of the two ex-service P91 steel materials tested, one was previously in operation for over 110,000 hours at 590°C (denoted P91-B) and the other at 600°C for over 100,00 hours (denoted P91-C). Metallographic analysis has been performed on the as-received material P91-A and the ex-service material P91-B, as shown in Figure 1, where the materials was etched using Villela agent (containing 1g of picric acid, 5ml of HCI and 100 ml of ethanol). Similar microstructures are seen in both as received and ex-service materials where the expected lath martensite microstructure is observed
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