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Effects of austenitizing temperature on microstructure and mechanical properties of 22Mn2SiVBS steel

Zheng Cao

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Abstract

The relationship between microstructure and mechanical properties of low carbon air cooled bainite steel 22Mn2SiVBS under different austenitizing temperatures was studied with observation of microstructure and test of mechanical properties.The results show that the steel after austenitization at 1 200 ℃ and then air cooling can have the microstructure consisting mostly of granular bainite.The values of αK,σb and σs can each 72.8 J/cm2,978 MPa and 870 MPa respectively.The Brinell hardness can reachs 285 HBW.The combination of excellent strength and toughness of the steel can meet the operating requirement for axle shaft bushing of automobiles.

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What this paper is about

The relationship between microstructure and mechanical properties of low carbon air cooled bainite steel 22Mn2SiVBS under different austenitizing temperatures was studied with observation of microstructure and test of mechanical properties.The results show that the steel after austenitization at 1 200 ℃ and then air cooling can have the microstructure consisting mostly of granular bainite.The values of αK,σb and σs can each 72.8 J/cm2,978 MPa and 870 MPa respectively.The Brinell hardness can reachs 285 HBW.The combination of excellent strength and toughness of the steel can meet the operating requirement for axle shaft bushing of automobiles.

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Available abstract

The relationship between microstructure and mechanical properties of low carbon air cooled bainite steel 22Mn2SiVBS under different austenitizing temperatures was studied with observation of microstructure and test of mechanical properties.The results show that the steel after austenitization at 1 200 ℃ and then air cooling can have the microstructure consisting mostly of granular bainite.The values of αK,σb and σs can each 72.8 J/cm2,978 MPa and 870 MPa respectively.The Brinell hardness can reachs 285 HBW.The combination of excellent strength and toughness of the steel can meet the operating requirement for axle shaft bushing of automobiles.

Key concepts: Microstructure, Brinell scale, Materials science, Bainite, Austempering, Austenite, Metallurgy, Toughness

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