Evaluation of Local Mechanical Properties of High Strength Steels by Indentation Method

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  • 高強度鋼のインデンテーション法による局所力学特性評価

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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.

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