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High strength steels are used for various important components such as rolling bearings to ensure safety. Strength designs for these components require material properties at the local areas. The objective of the present study is to evaluate the local mechanical properties of high strength steels by the dual-indenter method. Non-dimensional Π function is developed for 118 degree trigonal pyramid indenter using finite-element method. Dual-indenter method is conducted by indenters with the apex angles of 115 and 118 degrees for SUJ2 and SUJ3. The results reveal that good agreements are achieved between stress-strain curves of tensile testing and those of the dual-indenter method. The local mechanical properties are evaluated by the dual-indenter method for induction-hardened and carburized components.There are some differences in stress-strain curves at the locations of the components by the influence of the heat treatments. 緒 言

We used first-principles calculations based on density functional theory and the Boltzmann transport equation with an empirical relaxation time scheme to investigate the thermoelectric (TE) properties of Bi2(Se x Te1-x )3 alloys. We examined various TE indicators and found that Bi2SeTe2 shows relatively highest TE performance in Bi2(Se x Te1-x )3 alloys than bulk Bi2Te3. The result indicated that it is difficult to find the favorable Se composition for Bi2(Se x Te1-x )3 via power factor. The findings suggested that our computational framework provides a useful guide for the effect of Se incorporation on TE performance of Bi2(Se x Te1-x )3 alloys.

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