Gas Nitriding Behaviour of 34CrAlNi7 Nitriding Steel

• Authors: I. Altinsoy , K. Onder , F. Celebi Efe , C. Bindal
• Languages of publication: EN

Abstracts

EN

In this study, gas nitriding behavior of 34CrAlNi7-10 steel was investigated. Single stage processes were carried out at 500°C, 520C and 540C for 10, 20, 30 h, respectively. Nitrogen activity on surface was controlled by the nitriding potential K_{N} which is known as thermodynamical control parameter for controlled gas nitriding process. The presence of nitrides formed on surface of test material was determined by X-ray diffraction analysis technique. The morphology of nitrided layer was studied by optical microscope. The microhardness of surface of nitrided sample in HV_1 was observed between 975 and 1132. Choosing the right nitriding potentials for each temperature, which give the same nitrogen concentration and activity on surface by using the Lehrer diagram, showed that all the samples had almost the same surface roughness of R_{a} = 0.28-0.32 μm after gas nitriding cycles. The measurements showed that the white layer thickness varies between 4.38 μm and 28.80 μm and the growth of the layer was strongly affected by process time and temperature. Diffusion depths as Nht (HV) for each experiment were determined and compared.

Keywords

EN

81.05.Bx; 81.65.Lp

Discipline

• 81.05.Bx: Metals, semimetals, and alloys
• 81.65.Lp: Surface hardening: nitridation, carburization, carbonitridation

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2014
• Volume: 125
• Issue: 2
• Pages: 414-416

Dates

published

2014-02

Contributors

author

I. Altinsoy

• Sakarya University, Engineering Faculty, Department of Metallurgy and Materials Engineering Esentepe Campus, Serdivan, Sakarya, Turkey

author

K. Onder

• Mikrosan Makina ve Kalıp San, A.S. Heat Treatment Department, Izmit, Kocaeli, Turkey

author

F. Celebi Efe

• Sakarya University, Karasu Vocational High School

author

C. Bindal

• Sakarya University, Engineering Faculty, Department of Metallurgy and Materials Engineering Esentepe Campus, Serdivan, Sakarya, Turkey

References

• 1. K. Önder, M.Sc. Thesis, T.C. Sakarya Üniversity, 2013
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• 3. C. Ginter, L. Torchane, J. Dulcy, M. Gantois, A. Malchere, C. Esnouf, T. Turpin, La Metallurgia Italiana 7-8, 29 (2006)
• 4. Y. Lakhtin, doi: 10.1007/BF01153864, Metal Sci. Heat Treatm. 38, 6 (1996)
• 5. M. Korwin, W. Liliental, L. Maldzinski, A. Czelusniak, G. Tymowski, Nitreg Controlled Gas Nitriding an Enviroment-Friendly Process for Surface Hardening of Steel, Nitrex Metal Inc., Canada 1999
• 6. Y. Lakhtin, N. Silina, V. Fedchun, doi: 10.1007/BF00769606, Nature of the High Hardness and Brittleness of the Nitrided Case on Steel 38Kh2MYuA, Plenum Publishing Corporation, 1981, p. 162
• 7. S. Hosmani, R. Schacherl, E. Mittemeijer, Compound Layer Formation on Iron Based Alloys upon Nitriding; Phase Consitution and Pore Formation, Carl Hanser Verlag, HTM, München 2008, p. 139

Identifiers

DOI

10.12693/APhysPolA.125.414