Journals Information
Manufacturing Science and Technology(CEASE PUBLICATION) Vol. 3(5), pp. 259 - 265
DOI: 10.13189/mst.2015.030511
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Prediction of Hardness for Partially Quenched Boron Steel Using Quench Factor Analysis
J. Y. Choi 1,*, J. H. Kim 1, D. H. Ko 1, P. K. Seo 2, D. C. Ko 3, B. M. Kim 4
1 Precision Manufacturing System Division, Pusan Nat'l University, South Korea
2 Department of Production, Shinyoung Co. Ltd., South Korea
3 Industrial Liaison Innovation Center, Pusan Nat'l University, South Korea
4 School of Mechanical Engineering, Pusan Nat'l University, South Korea
ABSTRACT
The mechanical properties of hot stamped boron steel have been generally predicted by many empirical models based on the Kirkaldy's equation. Although predicting previous models are well-developed for prediction of mechanical properties, use of those models is still limitary in case of partial quenching process for tailored properties of component. Therefore, this study predicted the mechanical property of partially quenched boron steel by heated tools using the FE-simulation coupled with quench factor analysis (QFA). The dilatometry test of boron steel is performed at various ranges of cooling rates from 0.5 to 70℃ /s of which results are used to determine the material constants (K1~K8) of QFA and the time-temperature-property (TTP) diagram of boron steel. And then, FE-simulation of partial quenching is carried out to obtain the cooling curves according to heating temperatures of tool. The extracted results from FE-simulation are combined with the QFA to calculate the hardness distribution of partially quenched parts. Finally, experiment of partial quenching is performed to verify the predicted results and to examine the effect of tool temperatures on the hardness of formed part. The predicted hardnesses of U-channel parts are in good agreement with the measured ones within a maximum error of 7.4%.
KEYWORDS
Quenching Factor Analysis, Time-temperature-property Diagram, Hardness, Partial Quenching, Tool Tempering, Dilatometry Test
Cite This Paper in IEEE or APA Citation Styles
(a). IEEE Format:
[1] J. Y. Choi , J. H. Kim , D. H. Ko , P. K. Seo , D. C. Ko , B. M. Kim , "Prediction of Hardness for Partially Quenched Boron Steel Using Quench Factor Analysis," Manufacturing Science and Technology(CEASE PUBLICATION), Vol. 3, No. 5, pp. 259 - 265, 2015. DOI: 10.13189/mst.2015.030511.
(b). APA Format:
J. Y. Choi , J. H. Kim , D. H. Ko , P. K. Seo , D. C. Ko , B. M. Kim (2015). Prediction of Hardness for Partially Quenched Boron Steel Using Quench Factor Analysis. Manufacturing Science and Technology(CEASE PUBLICATION), 3(5), 259 - 265. DOI: 10.13189/mst.2015.030511.