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- W2906292219 abstract "Abstract The primary aim of the present study was to investigate the impacts of tempering (at 200–300 °C) on microstructure and mechanical properties of commercial spring steel of 60Si2CrV grade under “Quenching and Partitioning” heat treatment. Three different heat treatment routes were applied: (a) oil quenching and tempering at 300 °C (Q-T), (b) bath quenching at 160 °C followed by partitioning at 300 °C for 300 s (Q-P), and (c) the same Q-P treatment followed by tempering at 200 °C, 250 °C, and 300 °C for 90 min (Q-P-T), and it was found that due to the formation of tempered martensite/carbide-free bainite/retained austenite (16 vol%) structure, Q-P treatment significantly improved the tensile/impact behavior of spring steel as compared to the Q-T treatment. Moreover, stress relief tempering at 200–300 °C caused a two-fold increase in ductility (up to 9%) and manifested improved ultimate tensile strength (2022–2065 MPa) and U-notched impact toughness (64–64 J/cm2) in comparison to Q-P treatment. Further, tempering at 200–250 °C resulted in the impact fracture of steel in combination of quasi-cleavage facets with dimpled ruptured profile; tempering at 250–300 °C led to the partial transformation of retained austenite into bainite accompanied with increase in carbon content in austenite; tempering at 300 °C caused 30% decrease in impact toughness of spring steel as compared to Q-P treatment due to the formation of cementite carbide precipitation. In addition, the structural properties of spring steel in different tempering stages were analyzed using SEM, TEM, XRD, dilatometric and magnetometric measurements." @default.
- W2906292219 created "2019-01-01" @default.
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- W2906292219 date "2019-02-01" @default.
- W2906292219 modified "2023-10-17" @default.
- W2906292219 title "Effects of stress relief tempering on microstructure and tensile/impact behavior of quenched and partitioned commercial spring steel" @default.
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- W2906292219 doi "https://doi.org/10.1016/j.msea.2018.12.106" @default.
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