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Determination of factors ınfluencing distortion of carburized quenching of steel shafts using DoE with computer simulations
Date
2016-12-01
Author
Yılmaz, Hasan
Yazır, Büşra
Yıldız, Seçil
Davut, Kemal
Şimşir, Caner
Metadata
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Carburizing treatments involve longer holdings at the austenite region, which can produce a range of different prior-austenite grain sizes (PAGS) depending on the growth behavior. The PAGS influences hardenability, phase transformation kinetics and hence the final phase fraction; and therefore the final mechanical properties. Since the high-temperature austenite structure is transformed during subsequent cooling steps, controlling the formation of desired austenitic structure during carburizing treatment is difficult and particularly important. This study aims at predicting the PAGS during carburizing by using a model based on ideal grain growth law. In order to construct the validity of the model, SAE 8620H steel samples were austenitized at 3 different temperatures (850o C, 900o C, 925o C) for 3 different durations (15 min, 8 h, 24h), and then cooled at a rate of 350o C/s to ensure transformation to martensite. The PAGS of those samples were determined by metallographic examination using optical microscope. The PAGS were then determined by Heyn Intercept Method, performed on at least 5 micrographs per specimen. The results show that the grain growth behavior of the present 8620H steel can be explained by ideal grain growth law. The model parameters determined from the present experimental results agree reasonably well with the other studies on same steel grade.
URI
http://www1.metalurji.org.tr/immc2016/IMMC2016_Bildiriler.pdf
https://hdl.handle.net/11511/87101
Conference Name
18th International Metallurgy and Materials Congress , 29 Sept. - 01 Oct. 2016
Collections
Department of Metallurgical and Materials Engineering, Conference / Seminar
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H. Yılmaz, B. Yazır, S. Yıldız, K. Davut, and C. Şimşir, “Determination of factors ınfluencing distortion of carburized quenching of steel shafts using DoE with computer simulations,” Istanbul, Turkey, 2016, p. 485, Accessed: 00, 2021. [Online]. Available: http://www1.metalurji.org.tr/immc2016/IMMC2016_Bildiriler.pdf.