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Author: search.filters.author.Thakre J.G.Subject: search.filters.subject.P91

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    Effect of cooling medium on microstructure evolution and tensile properties of creep-strength-enhanced ferritic steel
    (2018) Pandey C.; Saini N.; Thakre J.G.; Mahapatra M.M.; Kumar P.
    In creep-strength-enhanced ferritic steels, hydrogen-induced cold cracking of weldments is a serious issue. In the present research work, the effect of cooling medium on tensile properties and microstructure evolution of P91 steel weldments has been studied. For water-cooling condition, the diffusible hydrogen metal in deposited metal was measured by the mercury method. The microstructure of weldments in different cooling condition was characterized by using the field-emission scanning electron microscope (FE-SEM) and optical microscope. The fractured tensile test samples were characterized using the FE-SEM. The maximum tensile strength was measured to be 624 MPa for air-cooling medium (very low level of diffusible hydrogen). � 2018 Sociedade Portuguesa de Materiais (SPM)
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    Nano-size Particle Evolution During Heat Treatment of P91 Steel and Their Effect on Micro Hardness
    (2017) Pandey C.; Mahapatra M.M.; Kumar P.; Saini N.; Thakre J.G.
    In the present research work, creep strength enhanced ferritic/martensitic P91 steel was subjected to varying normalizing (950�1150 �C) and tempering temperature (730�800 �C). The varying normalizing and tempering temperature effect on microstructure evolution (precipitate size and their distribution and grain size) and microhardness were performed. The heat treatment consequences on microstructure evolution revealed an increase in grain size, and decrease in fraction area of precipitates, with increase in normalizing temperature. The grain size was found to be decreased with increase in tempering temperature while fraction area of precipitates and precipitate diameter increased. For microstructure characterization, optical microscope and field emission scanning electron microscope were utilized. The microhardness was found to be increased with increase in normalizing temperature while it decreased with increase in tempering temperature. � 2017 The Indian Institute of Metals - IIM