@article{oai:mie-u.repo.nii.ac.jp:00004917,
 author = {Tamaki, Koreaki and 玉置, 維昭 and Suzuki, Jippei and 鈴木, 実平},
 journal = {Research reports of the Faculty of Engineering, Mie University},
 month = {Dec},
 note = {application/pdf, Hardness of tempered steels was investigated for five types of low alloy steels, including high strength steels and ferritic heat resisting steels. Tempering was carried out by two different ways ; the quenched specimen was held at a constant temperature, and it was subjected to a rising temperature with a given heating rate. Hardness of tempered steel is a function of the tempering parameter including temperature and time. In this paper, three parameters were employed for three tempering processes of  1)decomposing martensite,  2)delaying softening by the alloy elements and  3)secondary hardening by precipitating fine carbides, such as Mo2C and V4C3. Although these parameters have the similar form of the conventional tempering parameter, λ, three different values of activation energies were employed for three processes. The changes of hardness brought by three processes were expressed by the functions of a linear, logistigue and Gaussian distribution, respectively. The measured hardness could be approximated by the total of three functions.},
 pages = {9--20},
 title = {Estimation for Hardness of Tempered Steels},
 volume = {16},
 year = {1991}
}