Hello everyone,
I have some HSLA alloys, these alloys were carried out austenitization process at different temperature and time then quenched in water.
I am going to reveal the prior austenite grain size (PAG). is tempering treatment necessary (what temperature and time?) and please let me know which percentages of picric acid is suitable?
Many Thanks in advance!
Dear Seyed,
I am not a steel guy but I found following book in my library. “Metallographie” Schumann, V.E.B., Leipzig 1962.
Etchant for austenite grainsize of quenched and tempered steels:
5cm3 hydrochloric acid
1 g. picric acid
100 cm3 ethyl alcohol
The best results after tempering the martensite for 15 minutes at 200-250°C.
I hope this helps,
Cor van Ettinger
Suggestion by Cornelis Joannes van Ettinger seems quite good. Additionally, you may refer the following literature:
Sinha et al, "Delineation of Prior Austenite Grain Boundaries in a Low-Alloy High-Performance Steel"
Zhang and Guo, "A general etchant for revealing prior-austenite grain boundaries in steels"
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