Prediction of flow stress in Ti–6Al–4V alloy with an equiaxed α + β microstructure by artificial neural networks |
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Authors: | NS Reddy You Hwan Lee Chan Hee Park Chong Soo Lee |
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Affiliation: | aDepartment of Materials Science and Engineering, Pohang University of Science and Technology, Pohang, Kyungbuk 790-784, Republic of Korea;bWire Rod Research Group, Technical Research Laboratories, POSCO, Pohang, Kyungbuk 790-785, Republic of Korea |
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Abstract: | Flow stress during hot deformation depends mainly on the strain, strain rate and temperature, and shows a complex and nonlinear relationship with them. A number of semi-empirical models were reported by others to predict the flow stress during hot deformation. This work attempts to develop a back-propagation neural network model to predict the flow stress of Ti–6Al–4V alloy for any given processing conditions. The network was successfully trained across different phase regimes (α + β to β phase) and various deformation domains. This model can predict the mean flow stress within an average error of 5.6% from the experimental values, using strain, strain rate and temperature as inputs. This model seems to have an edge over existing constitutive model, like hyperbolic sine equation, and has a great potential to be employed in industries. |
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Keywords: | Hot deformation Neural networks Hyperbolic sine function Flow stress |
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