Comparison of Experimental Curves of Alloy Steels after Gas Nitriding

Yıl 2021, Cilt: 7 Sayı: 2, 46 - 49, 31.07.2021

Naim Syla Fisnik Aliaj Njomza Elezaj Bashkim Dalipi

https://doi.org/10.22399/ijcesen.798206

Öz

This study is concerned with experimental curves of: hardness, residual stress and concentration of nitrogen at the precipitation layer at alloy steels after gas nitriding. The purpose of this treatment is that through experimental curves to identify the relationship and causality between hardness, on one side, and on the other, residual stress respectively concentration of nitrogen. Comparing the shape and slope of these curves we can conclude that, concentration of diffused nitrogen on the steel lattice, respectively ferrite, is a cause of increased hardness at the precipitation layer. More to the point, as a result of nitrogen diffusion, residual stress emerge which cause increase of hardness. The intensity and slope of the curves of hardness depends on the intensity and slope of the nitrogen concentration respectively residual stress.

Anahtar Kelimeler

hardness, residual stress, nitrogen concentration, nitriding, steel

Kaynakça

• I. Altinsoy, G. F. Çelebi Efe, T. Yener, K. G. Önder, and C. Bindal, Effect of double stage nitriding on 34CrAlNi7-10 nitriding steel, Acta Phys. Pol. A 132 (2017) 663-666. DOI: 10.12693/APhysPolA.132.663
• C. W. Kang, S. R. Meka, T. Steiner, R. E. Schacherl, and E. J. Mittemeijer, Microstructural evolution of 31CrMoV9 steel upon controlled gaseous nitriding treatment, HTM - J. Heat Treat. Mater. 71 (2016) 181-190. DOI: 10.3139/105.110296
• N. Syla, N. Elezaj, F. Aliaj, Z. Tolaj, and A. Zeqiraj, Finite element modeling of 31CrMoV9 steel hardness curves after gas nitriding, Indian J. Chem. Technol. 26 (2019) 358-361
• N. Syla, B. Dalipi, N. Elezaj, F. Aliaj, Z. Tolaj, and A. Zeqiraj, Finite element (FE) modeling of the nitrogen concentration profile in 31CrMoV9 steel after gas nitriding, Emerg. Mater. Res. 9 (2020) 375-377. DOI: 10.1680/jemmr.18.00154
• D. Mohamed, B. N. Eddine, and D. Nacer, Effect of substrate preheating, roughness, and particle size on splat morphology of thermal sprayed coatings, Int. J. Comput. Exp. Sci. Eng. 1 (2015) 16-18
• N. Ozsoy, and M. Ozsoy, Optimization of surface roughness in the turning process of AISI 4340 tempering steel, Emerging Mater. Res. 9 (2020). DOI: 10.1680/jemmr.18.00141
• E. Altuncu, and M. Tarim, Laser cladding of martensitic stainless steels on armor steels, Emerging Mater. Res. 9 (2020). DOI: 10.1680/jemmr.18.00120
• N. Syla, A. Zeqiraj, N. Hasi, and N. Elezaj, Investigation of the compound layer formed by steel 16MnCr5 after gas nitriding, Emerging Mater. Res. 9 (2020). DOI: 10.1680/jemmr.18.00117
• E. J. Mittemeijer, in ASM Handbook: Fundamentals of Nitriding and Nitrocarburizing, Eds. J. L. Dossett and G. E. Totten, Vol. 4A (ASM International, Ohio, 2013) pp. 619-646. DOI: 10.31399/asm.hb.v04a.a0005818
• Z. Pokorný, D. Dobrocký, J. Kadlec, and Z. Studený, Influence of alloying elements on gas nitriding process of high-stressed machine parts of weapons, Met. Mater., 56 (2018) 97–103. DOI: 10.4149/km_2018_2_97
• N. Syla, F. Aliaj, and B. Dalipi, The law of growth of nitrided layer in 31CrMoV9 steel, Acta Phys. Pol. A 130 (2016) 83-86. DOI: 10.12693/APhysPolA.130.83
• M. A. Terres, L. Ammari, and A. Chérif, Study of the Effect of Gas Nitriding Time on Microstructure and Wear Resistance of 42CrMo4 Steel, Mater. Sci. Appl. 8 (2017) 93–507. DOI: 10.4236/msa.2017.86034
• W. A.-R. Dhafer, V. Kostyk, K. Kostyk, A. Glotka, and M. Chechel, The choice of the optimal temperature and time parameters of gas nitriding of steel, Eastern-European J. Enterp. Technol. 3 (2016) 44-50. DOI: 10.15587/1729-4061.2016.69809
• N. Syla, F. Aliaj, and M. Rama, Hardness curves for 31CrMoV9 steel after gas nitriding, Acta Phys. Pol. A 132 (2017) 484-486. DOI: 10.12693/APhysPolA.132.484
• N. Syla, F. Aliaj, Z. Tolaj, N. Mahmudi, and A. Zeqiraj, “The gas nitriding behavior of 31CrMoV9 grade steel,” J. Eng. Appl. Sci. 13 (2018) 6713-6718
• I. C. Noyan, J. B. Cohen. Residual stress – measurement by diffraction and interpretation, Springer-Verlag, New York, 1987
• F. Aliaj, and N. Syla, Influence of Al Content and Bias Voltage on the Microstructure of Ti1-xAlxN Hard Coatings, J. Eng. Appl. Sci., 5 (2010) 394–402. DOI: 10.3923/jeasci.2010.394.402
• P. S. Prevéy, Current applications of XRD diffraction residual stress measurement, Dev. Mater. Charact. Technol. ASM Int., 513 (1996) 103-110