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T, Anilkumar
- Effect of Polymer Quenchants on the Toughness and Hardness of Different Medium Carbon Low Alloy Steels.
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Authors
Affiliations
1 Associate Professor, Dept. of Mechanical Engineering, Ramaiah Institute of Technology, Bangalore, Karnataka, India., IN
2 Professor & Head, Dept. of Mechanical Engineering, G. Madegowda Institute of Technology, Mandya, Karnataka, India., IN
3 Senior Grade Lecturer, Dept. of Mechanical Engineering (W&SM), SJ Polytechnic, Bangalore, Karnataka, India., IN
1 Associate Professor, Dept. of Mechanical Engineering, Ramaiah Institute of Technology, Bangalore, Karnataka, India., IN
2 Professor & Head, Dept. of Mechanical Engineering, G. Madegowda Institute of Technology, Mandya, Karnataka, India., IN
3 Senior Grade Lecturer, Dept. of Mechanical Engineering (W&SM), SJ Polytechnic, Bangalore, Karnataka, India., IN
Source
Journal of Mines, Metals and Fuels, Vol 70, No 10A (2022), Pagination: 226-234Abstract
In the present study, medium carbon low alloy (MCLA) steels like AISI 5140 (EN18) and AISI 4140 (EN19) are treated in different quenching media under solutionizing temperature of 855°C. Quenched in SAE 250 oil, polyethylene glycol (PEG) (10% and 30%), and water. The quenched samples are step-tempered at 575°C and at 220°C sequentially with 60 minute soaking time. BHN, YS, UTS and tensile toughness are determined for the untreated and heat-treated samples. It is found that there is an excellent correlation, with correlation coefficients of 0.97. The standard generalized equation for these two steels are established. Tensile toughness = 19000 + 12 BHN- 215 El. The study revealed that the PEG is better in terms of cost, fire-resistant and biodegradable. 30% polymer quenched samples result in better tensile toughness properties as compared to 10% polymer quenched samples.
Keywords
Medium Carbon Low Alloy Steel (MCLA), AISI 5140, AISI 4140, Polyethylene Glycol (PEG), Tensile Toughness, Percentage Elongation.
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