Development of a combined technology for hardening the surface layer of steel 38Cr2MoAl

Authors

DOI:

https://doi.org/10.15587/1729-4061.2017.100014

Keywords:

structural steel, surface hardening, combined treatment, laser treatment, nitriding, layer thickness, hardness

Abstract

Development of new combined strengthening technologies for treatment of steel surface layer is a topical issue. Influence of conditions of combined hardening treatment on variation of properties of the surface layer of 38Cr2MoAl steel was studied. Experimental data have shown that thickness of the hardened layer of 38Cr2MoAl steel, depending on the process conditions of combined treatment, varied in the range 0.18 to 0.69 mm with the surface hardness being 10.5–12.5 GPa. Mathematical models of the hardened layer thickness and surface hardness were obtained depending on variation of velocity of the laser beam travel and duration of nitriding of steel following the combined treatment. In their structure, the models are regression equations. These regularities have practical technological significance and ensure prediction of values of the hardened layer thickness and surface hardness. Nomograms of simultaneous influence of velocity of the laser beam travel and duration of nitriding on thickness of the hardened steel layer and surface hardness were constructed. Nomograms make it possible to determine concrete conditions of hardening processing, starting from specified thickness of the hardened layer or the surface hardness of 38Cr2MoAl steel, respectively and also to solve inverse problems. This method is suitable for hardening hard-to-reach part sectios and local contact areas.

Author Biographies

Alaa Fadhil І Idan, National Technical University «Kharkiv Polytechnic Institute» Kyrpychova str., 2, Kharkіv, Ukraine, 61002

Postgraduate student

Department of Foundry production

Oleg Akimov, National Technical University «Kharkiv Polytechnic Institute» Kyrpychova str., 2, Kharkіv, Ukraine, 61002

Doctor of Technical Sciences, Professor, Head of Department

Department of Foundry production

Kateryna Kostyk, National Technical University «Kharkiv Polytechnic Institute» Kyrpychova str., 2, Kharkіv, Ukraine, 61002

PhD, Associate Professor

Department of Foundry production

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Published

2017-04-26

How to Cite

Idan A. F. І., Akimov, O., & Kostyk, K. (2017). Development of a combined technology for hardening the surface layer of steel 38Cr2MoAl. Eastern-European Journal of Enterprise Technologies, 2(11 (86), 56–62. https://doi.org/10.15587/1729-4061.2017.100014

Issue

Vol. 2 No. 11 (86) (2017): Materials Science

Section

Materials Science

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Copyright (c) 2017 Alaa Fadhil І Idan, Oleg Akimov, Oleg Akimov, Oleg Akimov, Oleg Akimov, Kateryna Kostyk, Oleg Akimov, Kateryna Kostyk, Kateryna Kostyk, Kateryna Kostyk, Kateryna Kostyk

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