Determination of flow stress and the critical strain for the onset of dynamic recrystallization using a hyperbolic tangent function期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

Determination of flow stress and the critical strain for the onset of dynamic recrystallization using a hyperbolic tangent function

Affiliation:	1. Department of Structural Steels, Central Iron and Steel Research Institute, Beijing 100081, China;2. The State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang 110819, China;3. Shougang Research Institute of Technology, Beijing, 100043, China;1. AGH University of Science and Technology, al. Mickiewicza 30, 30-059 Krakow, Poland;2. Institute for Ferrous Metallurgy, ul. Karola Miarki, Gliwice, Poland;1. POSCO Technical Research Laboratories, Pohang 790-300, Republic of Korea;2. Division of Industrial Metrology, Korea Research Institute of Standards and Science, Daejeon 305-340, Republic of Korea;3. Graduate Institute of Ferrous Technology, Pohang University of Science and Technology, Pohang 790-784, Republic of Korea;1. Institute for Metallurgy, Robert-Koch-Straße 42, 38678 Clausthal, Germany;2. Salzgitter Mannesmann Forschung GmbH, Eisenhttenstraße 99, 38239 Salzgitter, Germany

Abstract:	A new model has been developed to estimate the flow stress under hot deformation conditions up to the peak of the stress–strain curves. This model is derived from the general form of hyperbolic function by introducing an additional parameter to bring the results to a more acceptable level. Stress–strain curves and the critical strain of a ‘304 austenitic stainless steel’ are determined with an average percentage error of 1.24. The model is also used to obtain an equation which has the ability of predicting the critical strain for the onset of dynamic recrystallization.

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