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Microstructure Characterization and Mechanical Properties of Modified 9Cr Steel
Author(s) -
Mandal Anup,
Bandyopadhyay Tapas Kumar
Publication year - 2017
Publication title -
steel research international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.603
H-Index - 49
eISSN - 1869-344X
pISSN - 1611-3683
DOI - 10.1002/srin.201600317
Subject(s) - materials science , tempering , microstructure , ultimate tensile strength , metallurgy , martensite , niobium , tensile testing , ductility (earth science) , forging , carbide , titanium , texture (cosmology) , composite material , quenching (fluorescence) , chromium , creep , physics , quantum mechanics , artificial intelligence , computer science , image (mathematics) , fluorescence
The work describes the effect of heat treatment on microstructure, and mechanical behavior titanium and niobium modified 9% chromium steel. The initial cast and forged microstructures consist of martensitic structure. The martensitic structure changes with increasing tempering temperature. Fine precipitates are found during tempering at 700 °C. Precipitates are carbides of chromium, niobium, and titanium. The room temperature tensile behavior of the steel is strongly dependent on processing and subsequent heat treatment. The tensile properties (YS and UTS) increase with increasing tempering temperature from 700 to 750 °C. The tensile properties of the steel improve in case of rolling sample compared to forging sample due to texture formation. But tensile properties decrease with increasing tempering time from 1 to 5 h at a fixed temperature (700 °C). The high‐temperature tensile test result shows that YS and UTS decrease whereas ductility increases with increasing temperature. True stress also decreases with increasing temperature.