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    Volume 7, Issue 1 (September 2018)

    Grain Refinement of P91 Steel Using Double Austenitization Treatment

    (Received 12 June 2018; accepted 3 August 2018)

    Published Online: 24 September 2018

    CODEN: MPCACD

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    Abstract

    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.

    Author Information:

    Pandey, Chandan
    Department of Mechanical Engineering, SRM IST-Delhi NCR Campus, Modinagar,

    Mahapatra, M. M.
    School of Mechanical Sciences, Indian Institute of Technology, Bhubaneswar, Odisha,

    Kumar, Pradeep
    Department of Mechanical and Industrial Engineering, Indian Institute of Technology Roorkee, Uttrakhand,

    Saini, N.
    Department of Mechanical and Industrial Engineering, Indian Institute of Technology Roorkee, Uttrakhand,

    Thakre, J. G.
    Department of Mechanical and Industrial Engineering, Indian Institute of Technology Roorkee, Uttrakhand,

    Kumar, Prakash
    Department of Production Engineering, Birla Institute of Technology, Mesra, Jharkhand


    Stock #: MPC20180094

    ISSN:2379-1365

    DOI: 10.1520/MPC20180094

    Author
    Title Grain Refinement of P91 Steel Using Double Austenitization Treatment
    Symposium ,
    Committee A01