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Grain refinement of P91 steel using double austenitization treatment
, M.M. Mahapatra, P. Kumar, N. Saini, J.G. Thakre, P. Kumar
Published in ASTM International
Volume: 7
Issue: 1
Pages: 445 - 455
The effect of conventional normalizing and tempering (CNT) and double austenitization-based normalizing and tempering (DNT) heat treatments on the microstructure evolution and mechanical properties of creep strength-enhanced ferritic P91 steel were studied. CNT treatment was performed at 1,050°C and air cooled for 1 h and also at 760°C and air cooled for 2 h. In double austenitization- based normalizing heat treatment, steel was austenitized at 1,050°C and air cooled for 1 h and then normalized in a temperature range of 950°C -1,150°C for 1 h followed by water quenching. After the double normalizing, tempering is performed at 760°C for 2 h. A DNT treatment resulted in homogeneous microstructure formation that led to improved mechanical properties as compared to CNT treatment. The incomplete dissolution of precipitates in single-stage tempering resulted in incomplete martensitic structure formation. © 2018 by ASTM International.
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JournalData powered by TypesetMaterials Performance and Characterization
PublisherData powered by TypesetASTM International
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