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Recent regulations on CO2 emissions and fuel consumption imposed on automobiles have driven the requirements for downsizing automobile components to high levels. Therefore, the gear and shaft parts used for power transmission are required to have higher strength and toughness. In response to these circumstances, we developed a surface hardening treatment that combines vacuum carburizing and subsequent induction hardening. This process was called mild-carburizing.1,2) The mild-carburizing treatment forms a normalized microstructure with the required carbon concentration distribution through vacuum carburizing and subsequent slow cooling. Afterward, the induction heating and water quenching are performed to form a martensite (α’) microstructure. The vacuum carburizing treatment was performed at the hyper-eutectoid composition to form pearlite and proeutectoid cementite (θ). Subsequently, water quenching was performed after induction heating between A1 and Acm in order to control the dispersion of undissolved θ and the Crack Propagation Behavior of Impact Fracture in Case Hardening Steel Subjected to Combined Heat Treatment with Excess Vacuum Carburizing and Subsequent Induction Hardening

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Crack Propagation Behavior of Impact Fracture in Case Hardening Steel Subjected to Combined Heat Treatment with Excess Vacuum Carburizing and Subsequent Induction Hardening