Influence of Multiphase High Silicon Steel (Retained Austenite-RA, Ferrite-F, Bainite-B and Pearlite-P) and Carbon Conte
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ORIGINAL PAPER
Influence of Multiphase High Silicon Steel (Retained Austenite-RA, Ferrite-F, Bainite-B and Pearlite-P) and Carbon Content of RA-Cγ on Rolling/Sliding Wear Rajan Kumar 1 & Ravi Kumar Dwivedi 1 & Siraj Ahmed 1 Received: 29 May 2020 / Accepted: 1 September 2020 # Springer Nature B.V. 2020
Abstract In this research work, heat-treatment processes have been utilized to obtain multiphase microstructure in the silicon rich steel samples, silicon in the steel helps in the development of multiphase microstructure and to keep away from carbide precipitation development through the austempering. The desired multiphase microstructure (Retained austenite-RA, Ferrite-F, Bainite-B and Pearlite-P) consisting of continuous cooling (CC) for 0, 20 and 40 s respectively after austenization followed by austempering at (300, 350 and 400 °C) to form a high wear resistance multiphase steels with microstructure varies amount of F,B, P and RA during continuous cooling. Steels with varies retained austenite up to (5±1.1 to 18±1.9%) along with excellent specific wear rate (2.038 × 10−9-1.061 × 10−8 m3/N-m) were obtained. Further, the rolling/sliding wear rate has been obtained through the disc-ondisc experimental setup. The effect of continuous cooling on retained austenite, carbon content of retained austenite on specific rolling/sliding SWR (specific wear rate) has been studied; phase fraction (P, B and F) and the materials characterization with the help of XRD, AFM and FE-SEM. Keywords Wear . Multiphase steel . FE-SEM . XRD . AFM
1 Introduction Design and Developed of steels having high wear resistance capability combined with high toughness and also economically beneficial has been the foremost required viewpoint for metallurgists. Within the recent years, steels containing various alloying elements like silicon with retained austenite (RA) along with other micro-constituents like martensite (M), ferrite (F), pearlite (P) and bainite (B) as the constituent phases which produce during various heat treatment processes like quenching, intercritical annlealing, normalising and austempering and isothermal or continuous cooling transformation have emerged as a superior and modest choice for the railways and automotive industry [1–3]. In most of the common multi-phase steel, martensite and bainite microstructure * Rajan Kumar [email protected] 1
Department of Mechanical Engineering, Maulana Azad National Institute of Technology Bhopal, Bhopal 462003, India
for the most part add to strength and hardness, while the ferrite is soft phase which alters the strain hardening rate during the underlying phase of yielding to reinforce ductility. The aggregate commitment of different phases leads to better predominant mechanical and physical properties as hardness, strength toughness, ductility, wear and corrosion resistance etc. [4]. However, the mechanical properties can be additionally improved past those gotten in the multiphase framework by combining retained austenite phase constituent in the microstructure. This is often ma
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