Effect of Kind Rolling on the Properties of Plasma-Formed Nitride Layers on Fe93Ni4Ti3

Fayez Mahomoud El-Hossary, Sayed Mohammed Khalil, Magdy Abdel Wahab Kassem, Khaled Lotfy

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DOI: 10.4236/jmp.2010.13022                

Abstract

The nitriding behavior of cold rolled Fe93Ni4Ti3 specimens was compared with that of hot rolled specimens of the same materials. Radio frequency (rf) nitriding was performed for 10 minutes in a 10-2 mbar nitrogen atmosphere. The continuous plasma power was varied from 300-550 W in steps 50 W or less. Results of optical microscopy (OM), x-ray diffraction (XRD) and microhardness measurements (Hv) are presented and discussed with regard to the influence of kind rolling on the nitriding behavior, particularly nitride formation and nitride layer growth on mechanical properties. The results show a remarkable increase of nitrogen diffusivity and microhardness of cold rolled nitride samples. These best results may be attributed to enhancement of the defect and/or a compressive stress.

Keywords

Cold Rolled, Hot Rolled-Radio Frequency (Rf), Microhardness, Optical Microscopy (OM), X-Ray Diffraction (XRD)

Conflicts of Interest

The authors declare no conflicts of interest.

References

[1]	F. M. El-Hossary, “The Influence of Surface Microcracks and Temperature Gradients on the Rf Plasma Nitriding Rate,” Surface and Coatings Technology, Vol. 150, No. 2, 2002, pp. 277-281.
[2]	F. M. EL-Hossary, N. Z. Negm, S. M. Khalil, A. M. Abd Elrahman and D. N. Mcllroy, “RF Plasma Carbonitriding of AISI Austenitic Stainless Steel,” Surface and Coatings Technology, Vol. 141, No. 2-3, 2001, pp. 194-201.
[3]	C. B. Craus, A. R. Chezan, N. G. Chechenin, D. O. Boerma and L. Niesen, “Soft Magnetism in Nitrided Fe93Ni4Cr3 and Fe94Ni4Ti2 Cold–Rolled Alloys,” Journal of Magnetism and Magnetic Materials, Vol. 263, No. 1-2, 2003, pp. 47-56.
[4]	G. Edrem and Y. Taptik, “Effect of Hot Rolling Conditions to Produce Deep Drawing Quality Steels for Continuous Annealing Process,” Journal of Material Processing Technology, Vol. 170, No. 1-2, 2005, pp. 17- 23.
[5]	H. Katoh, H. Takachi, N. Takahashi and M. Abe, “Cold Rolled Steel Sheets Produced by Continuous Annealing, Technology Continuously Annealed Cold-Rolled Steel,” 1984, pp. 37-38.
[6]	H. Ferkel, M. Glatzer, Y. Estrin and R. Z. Valiev, “RF Plasma Nitriding of Severely Deformed High Alloyed Steel,” Scripta Material Science, Vol. 46, No. 9, 2002, pp. 623-628.
[7]	F. Mahboubi and K. Abdolvahabi, “The Effect of Temperature on Plasma Nitriding Behavior of DIN 1.6959 Low Alloy Steel,” Vacuum, Vol. 81, No. 3, 2006, pp. 239-243.
[8]	H. Ferkel, M. Glatzer, Y. Estrin, R. Z. Valiev, C. Blawert and B. L. Mordike, “RF Plasma Nitriding of Severely Deformed Iron-Based Alloys,” Materials Science and Engineering A, Vol. 348, No. 1-2, 2003, pp. 100-110.
[9]	G. Pantazopoulos, P. Psyllaki, D. Kanakis, S. Antoniou, K. Papadimitriou and J. Sideris, “Tribological Properties of a Liquid Nitrocarburised Special Purpose Cold Work Tool Steel,” Surface and Coatings Technology, Vol. 200, No. 20-21, 2006, pp. 5889-5895.
[10]	H. Ferkel, Y. Estrin, C. Blawert and R. Z. Valiev, “RF Nitriding of Severely Deformed Armco Iron and St2 K50,” Surface and Coatings Technology, Vol. 173-174, 2003, pp. 1164-1170.
[11]	A. R. Chezan, C. B. Craus, N. G. Chechenin, T. Vystavel, L. Niesen, J. T. M. De Hosson and D. O. Boerma, “On the Formation of Ultra-Fine Grained Fe-Base Alloys Via Phase Transformations,” Materials Science and Engineering A, Vol. 367, No. 1-2, 2004, pp. 176-184.
[12]	F. M. El-Hossary, S. M. Khalil, K. Lotfy and M. A. Kassem, “The Influence of Hot-Rolled Temperature on Plasma Nitriding Behavior of Iron-Based Alloys,” Journal of Low Temperature Physics, Vol. 156, No. 1-2, 2009, pp. 38-47.
[13]	M. U. Devi and O. N. Mohanty, “Plasma-Nitriding of Tool Steels for Combined Percussive Impact and Rolling Fatigue Wear Applications,” Surface and Coatings Tech- nology, Vol. 107, No. 1, 1998, pp. 55-64.