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This research discusses the machine component distortion problem after the hardening process. This research focuses on the inside diameter of the hole and gap width dimension changes in components. Austenite temperature, quench medium, and material thickness were examined to determine their effect on distortion. The components are made of AISI 4140 machinery steel group. Another idea in this study is to substitute the material with AISI 4340 to minimize the risk of distortion. This study used a Navy C-Ring specimen. This study applies the Design of Experiment, followed by statistical analysis with ANOVA and Response Surface optimization. The austenite temperature of 895.2°C, oil quench medium, and 8 mm thickness are the best hardening parameters for AISI 4140, which reduce inside diameter distortion up to 82.51% and reduce gap width distortion up to 78.16%. Austenite temperature of 900°C, oil cooling medium, and 8 mm thickness is the best hardening parameter for AISI 4340, which reduces inside diameter distortion by up to 62.23% and reduces gap width distortion by up to 86.61%. Material substitution of AISI 4140 with AISI 4340 can be done by considering the risk of warping.

Experimental investigation of SC108 clamping components hardening parameter based on AISI 4140 steel to distortion minimization