Metall. Res. Technol.
Volume 115, Number 4, 2018
Trends in heat treatment and surface engineering
|Number of page(s)||10|
|Published online||22 August 2018|
Short time austenitizing effects on the hardenability of 0.55 wt. pct. Carbon steels
Advanced Steel Processing and Products Research Center, Department of Metallurgical and Materials Engineering, Colorado School of Mines, Golden,
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Accepted: 4 April 2018
Three laboratory melted steels containing 0.55 wt. pct. C were preconditioned by austenitizing at 900 °C and oil quenching. The oil quenched specimens were induction heated at a rate of 50 °C/s to 850 °C and the hardenability was determined for austenitizing times of 2 and 10 s. Alloy compositions of the three steels in wt. pct. were 0.8 Mn, 0.2 Mn–2.1 Ni, and 0.8 Mn–0.5 W. The changes in transformation behavior were determined on a quenching dilatometer and are described by CCT diagrams, hardness, and metallographic examination. The progression of transformation to austenite on heating was determined by metallographic examination of specimens quenched from several peak-heating temperatures. Changes in austenite grain size with the induction heating time were also characterized. The quench rate required to attain fully martensitic microstructures increased as the austenitizing time was reduced from 10 to 2 s. Conventional hardenability calculation methods did not accurately forecast the hardness and microstructure under conditions of rapid induction hardening.
Key words: induction heating / austenite transformation / austenite grain size / hardenability
© EDP Sciences, 2018
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