Authors : Sumar Hadi Suryo, A.P. Bayuseno, Paryanto and A. Ridho Pangeran
Abstract: In material aspect, AISI 4140 steel is categorized into low alloy steel or steel having alloy #2.5 %. AISI 4140 is mostly used in components requiring good mechanical properties such as bucket teeth excavator. However, hardness value of AISI 4140 material does not fulfill standard of bucket teeth (40 HRC). This is why this research using Taguchi method aiming to search optimum hardness value based on its heat treatment is conducted. Several factors influencing hardness value of AISI 4140 are hardening temperature (830, 850 and 880°C), holding time (30, 45 and 60 min), quenching media (oil, water, salt water) and tempering temperature (400, 500 and 600°C). From calculation using Taguchi method, optimum conditions in every level of factors are hardening temperature is 830°C, restraint duration is 45 min, quenching media is oil and tempering temperature is 400°C. Besides from ANOVA calculation, factors influencing ASI 4140 material hardness value are tempering temperature (96%) and quenching media (1.5%). The result of confirmation experiment reveals that hardness value of test result having optimum condition is 46.03 HRC. Mechanical properties of AISI 4140 material obtained from test result with optimum condition is 1515.745 N/mm2 % elongation is 12.7% and impact strength is 5.67 kg/cm2.
Sumar Hadi Suryo, A.P. Bayuseno, Paryanto and A. Ridho Pangeran, 2018. Parameter Optimization of Heat Treatment on AISI 4140 Material Hardness Value for Bucket Teeth Application Using Taguchi Method. Journal of Engineering and Applied Sciences, 13: 5873-5880.