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Time-Temperature-Hardness Diagrams of Tempered Steels Tamaki, Koreaki 玉置, 維昭 Suzuki, Jippei 鈴木, 実平 Tempered hardness Tempering parameter Low alloy steel Secondary hardening Precipitation of carbide application/pdf Tempered hardness were investigated for carbon steels and low alloy steels containing chromium, molybdenum and vanadium. The renges of temperature and time were 675 to 975 K and 35 to 3.5 ×<special>106</special> s, respectively. The following results were obtained. 1)The tempered hardness of carbon steels can be approximated with a linear function of the tempereing parameter, λ proposed recently by T.Inoue, and is roughly a reciprocal proportion to the conventional tempering parameter, P. 2)The tempered hardness of low alloy steels, however, can not be expressed by the function of tempering parameter, because the secondary hardening or the delay of softening occur due to the precipitation of carbide, and therfore, the activation energy changes with the advance of tempering. 3)Time-temperature-hardness diagrams are proposed for showing the tempered hardness of low alloy steels. Faculty of Engineering, Mie University 1990-12-20 eng departmental bulletin paper VoR http://hdl.handle.net/10076/3959 https://mie-u.repo.nii.ac.jp/records/4903 0385-6208 AA00816341 Research reports of the Faculty of Engineering, Mie University 15 9 22 https://mie-u.repo.nii.ac.jp/record/4903/files/AA008163410150004.PDF application/pdf 724.5 kB 2017-02-18