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    Volume 9, Issue 2 (July 2020)

    Special Issue Paper

    Hot Deformation Studies and Optimization of Hot Working Parameters in Custom 465® Martensitic Precipitation Hardenable Stainless Steel

    (Received 12 April 2019; accepted 2 August 2019)

    Published Online: 08 November 2019

    CODEN: MPCACD

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    Abstract

    Hot deformation studies and optimization of hot working parameters and corresponding microstructure control were explored in Custom 465® ultrahigh-strength precipitation hardenable martensitic stainless steel. Hot compression tests were carried out in the temperature range of 800°C–1,100°C and at five different strain rates (0.001–10 s−1). Processing maps were developed based on the results of hot compression tests, employing principles of the Dynamic Materials Model, and various domains of microstructure evolution (in the austenite phase) were identified. The stable and unstable domains as well as domains indicating dynamic recrystallization (DRx) were identified from the processing map. The domain for DRx was confirmed by detailed microstructural investigations (prior austenite grains) of the respective water-quenched specimens, as well as from the inflections in hardening curves. The optimum conditions for processing Custom 465 steel were suggested as T = 1,075°C and ϵ, ˙, , =, 10, , −, 3, , , s, −, 1, , , , , , and can be used for initial ingot breakdown (cogging) operations and T = 925°C and ϵ, ˙, , =, 10, , −, 3, , , s, −, 1, , , , , , for finish forging operations to obtain grain size control. The value of the activation energy for hot deformation was calculated to be 543.88 kJ/mol for this steel.

    Author Information:

    Anoop, C. R.
    Materials and Mechanical Entity, Liquid Propulsion Systems Centre, Valiamala Post Office (ISRO), Thiruvanathapuram,

    Singh, R. K.
    Aerospace Materials Lab, Materials and Mechanical Entity, Liquid Propulsion Systems Centre, Valiamala Post Office (ISRO), Thiruvanathapuram,

    Kumar, Ravi Ranjan
    Materials and Mechanical Entity, Liquid Propulsion Systems Centre, Valiamala Post Office (ISRO), Thiruvanathapuram,

    Jayalakshmi, M.
    Materials and Mechanical Entity, Liquid Propulsion Systems Centre, Valiamala Post Office (ISRO), Thiruvanathapuram,

    Narayana Murty, S. V. S.
    Materials and Metallurgy Group, Vikram Sarabhai Space Center (ISRO), Thumba Post Office, Thiruvananthapuram,

    Thomas Tharian, K.
    Materials and Metallurgy Group, Vikram Sarabhai Space Center (ISRO), Thumba Post Office, Thiruvananthapuram,


    Stock #: MPC20190087

    ISSN:2379-1365

    DOI: 10.1520/MPC20190087

    Author
    Title Hot Deformation Studies and Optimization of Hot Working Parameters in Custom 465® Martensitic Precipitation Hardenable Stainless Steel
    Symposium ,
    Committee A01