Affiliation:
1. Dept of Mechanical Engineering Vignan's lara institute of technology & science Guntur-522213; e-mail:
Abstract
Abstract
To reveal the prior austenite grain (PAG) boundaries in Ferritic Martensitic steels with reduced activation by a peculiar etchant mixture of hydrochloric acid, nitric acid, and water has been developed. Etching with this system successfully delineates both, inside the grain and grain boundaries in RAFM steels at annealing temperatures 950–1250 °C and observed the abnormal grain growth at 1250 °C. Other two etchants Vilella's and Waterless Kalling's agents are uneffective at 1250 °C and do not reveal the abnormal grain growth. The specimens were austenitized at temperatures in the range 950–1250 °C. The suitable etching agent is successful to observe the micro structural features of RAFM steels.
Subject
Metals and Alloys,Mechanics of Materials,Condensed Matter Physics,Electronic, Optical and Magnetic Materials