Abstract
A low carbon Cr-Ni steel has been used to investigate the formation of upper bainite. Experimental results indicate that the start temperatures of the three morphologies of upper bainite in this steel,i.e., carbide-free bainite, bainite with carbide between and within ferrite laths, are about 600°, 500δ, and 425 °C, respectively; the habit plane of bainitic ferrite in this steel is close to (1 7 11)α, which is 13.3 deg away from (0 ll)α; and the orientation relationship between cementite and ferrite is consistent with Bagaryatskii’s. By means of the superelement approach, a thermodynamic treatment which applies to Fe-C alloys is extended into that suitable for low alloy steels, and calculation shows that the driving force for bainite formation at BS temperatures is insufficient to compensate for shear strain energy.
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Formerly Graduate Student, Department of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai, People’s Republic of China.
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Mou, Y., Hsu (Xu Zuyao), T.Y. Bainite formation in low carbon Cr-Ni steels. Metall Trans A 19, 1695–1701 (1988). https://doi.org/10.1007/BF02645137
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DOI: https://doi.org/10.1007/BF02645137