The effect of single and double quenching and tempering heat treatments on the microstructure and mechanical properties of AISI 4140 steel |
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| Affiliation: | 1. Los Alamos National Laboratory, Materials Science and Technology Division, PO Box 1663, Los Alamos, NM 87545, USA;2. Oak Ridge National Laboratory, Center for Nanophase Materials Science, PO Box 2008, Oak Ridge, TN 37831, USA;3. Colorado School of Mines, 1500 Illinois St., Golden, CO 80401, USA;1. School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China;2. School of Advanced Engineering, University of Science and Technology Beijing, Beijing 100083, China;3. Fushun Special Steel Co. Ltd., Fushun 113001, China;1. Department of Mechanical Engineering, Osmania University, Hyderabad, 500007, India;2. CSIR-National Metallurgical Laboratory Jamshedpur, 831 007, India;3. CSIR- Indian Institute of Chemical Technology, Tarnaka, Hyderabad, 500007, India;1. Department of Mechanical & Manufacturing Engineering, Manipal Institute of Technology, Manipal Academy of Higher Education, Manipal 576104, Karnataka, India;2. Department of Mechanical Engineering, National Institute of Technology, Surathkal 575025, Karnataka, India |
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| Abstract: | This investigation is concerned to evaluate the effect of double quenching and tempering (DQT) with conventional quenching and tempering (CQT) heat treatment processes on microstructure and mechanical behavior of a commercially developed hot rolled AISI 4140 type steel. Comparison of microstructure and mechanical properties of DQT and CQT heat treated specimens have been established in details. Optical and scanning electron microscopies have been used to follow impurity concentration and microstructural changes, and their relation to the associated mechanical properties. The results indicate that the improvement of mechanical properties particularly impact toughness of DQT heat treated specimens is much higher than that of the CQT condition, and this observation is rationalized in terms of finer austenite grain size developed in the DQT condition providing much finer martensitic packets within the grains and a lower level of impurity concentration of sulfur (S) and phosphorus (P) near the prior austenite grain boundaries as well. |
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