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Tool Steel Heat Treatment Optimization Using Neural Network Modeling

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Abstract

Optimization of tool steel properties and corresponding heat treatment is mainly based on trial and error approach, which requires tremendous experimental work and resources. Therefore, there is a huge need for tools allowing prediction of mechanical properties of tool steels as a function of composition and heat treatment process variables. The aim of the present work was to explore the potential and possibilities of artificial neural network-based modeling to select and optimize vacuum heat treatment conditions depending on the hot work tool steel composition and required properties. In the current case training of the feedforward neural network with error backpropagation training scheme and four layers of neurons (8-20-20-2) scheme was based on the experimentally obtained tempering diagrams for ten different hot work tool steel compositions and at least two austenitizing temperatures. Results show that this type of modeling can be successfully used for detailed and multifunctional analysis of different influential parameters as well as to optimize heat treatment process of hot work tool steels depending on the composition. In terms of composition, V was found as the most beneficial alloying element increasing hardness and fracture toughness of hot work tool steel; Si, Mn, and Cr increase hardness but lead to reduced fracture toughness, while Mo has the opposite effect. Optimum concentration providing high KIc/HRC ratios would include 0.75 pct Si, 0.4 pct Mn, 5.1 pct Cr, 1.5 pct Mo, and 0.5 pct V, with the optimum heat treatment performed at lower austenitizing and intermediate tempering temperatures.

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Acknowledgment

Research in this work was conducted within the Slovenian Research Agency research group P2-0050 (fracture toughness measurement) and P2-0056 (ANN modeling).

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Authors and Affiliations

  1. Institute of Metals and Technology, Lepi pot 11, 1000, Ljubljana, Slovenia

    Bojan Podgornik (Head of Department), Igor Belič (Researcher), Vojteh Leskovšek (Researcher) & Matjaz Godec (Director)

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  1. Bojan Podgornik
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  2. Igor Belič
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  3. Vojteh Leskovšek
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  4. Matjaz Godec
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Correspondence to Bojan Podgornik.

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Manuscript submitted May 2, 2016.

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Podgornik, B., Belič, I., Leskovšek, V. et al. Tool Steel Heat Treatment Optimization Using Neural Network Modeling. Metall Mater Trans A 47, 5650–5659 (2016). https://doi.org/10.1007/s11661-016-3723-0

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  • DOI: https://doi.org/10.1007/s11661-016-3723-0

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