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Metals 2017, 7(3), 75; doi:10.3390/met7030075

A Novel Methods for Fracture Toughness Evaluation of Tool Steels with Post-Tempering Cryogenic Treatment

1
Department of Engineering “E. Ferrari”, University of Modena and Reggio Emilia, Modena 41125, Italy
2
Stav, Barberino del Mugello, Florence 50031, Italy
*
Author to whom correspondence should be addressed.
Academic Editor: Filippo Berto
Received: 11 January 2017 / Revised: 6 February 2017 / Accepted: 20 February 2017 / Published: 27 February 2017
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Abstract

Cryogenic treatments are usually carried out immediately after quenching, but their use can be extended to post tempering in order to improve their fracture toughness. This research paper focuses on the influence of post-tempering cryogenic treatment on the microstructure and mechanical properties of tempered AISI M2, AISI D2, and X105CrCoMo18 steels. The aforementioned steels have been analysed after tempering and tempering + cryogenic treatment with scanning electron microscopy, X-ray diffraction for residual stress measurements, and micro- and nano-indentation to determine Young’s modulus and plasticity factor measurement. Besides the improvement of toughness, a further aim of the present work is the investigation of the pertinence of a novel technique for characterizing the fracture toughness via scratch experiments on cryogenically-treated steels. Results show that the application of post-tempering cryogenic treatment on AISI M2, AISI D2, and X105CrCoMo18 steels induce precipitation of fine and homogeneously dispersed sub-micrometric carbides which do not alter hardness and Young’s modulus values, but reduce residual stresses and increase fracture toughness. Finally, scratch test proved to be an alternative simple technique to determine the fracture toughness of cryogenically treated steels. View Full-Text
Keywords: fracture toughness; scratch test; residual stress; tool steel; cryogenic treatment fracture toughness; scratch test; residual stress; tool steel; cryogenic treatment
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Sola, R.; Giovanardi, R.; Parigi, G.; Veronesi, P. A Novel Methods for Fracture Toughness Evaluation of Tool Steels with Post-Tempering Cryogenic Treatment. Metals 2017, 7, 75.

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