Investigation nitride coating surface properties and wear on the hot work tool steel AISI H11 in the method pulsed plasma nitriding
Subject Areas :کیانوش طاهرخانی 1 , خیرالله محمدی 2 , حسین تارقلی زاده 3
1 - دانشگاه علم و صنعت ایران
2 - دانشگاه صنعتی مالک اشتر
3 - دانشگاه صنعتی مالک اشتر
Keywords: Plasma Nitriding, Different Geometryو Duty Cycle, Wear, AISI H11,
Abstract :
In this research, the effects of plasma nitriding parameters investigated on samples with different geometry. Samples were prepared were nitrided under the atmosphere content of 20%H2-80%N2, at the temperature of 520 c, the duty cycles of 30%, 50%, 80% and with frequencies of 10 kHz for 6 hours. Then the property of grooves surfaces investigate by experiments of the SEM, Roughness and Micro Hardness measurement. The results of the experiments showed that the surface of the plasma nitriding samples are covered by cauliflower form of particles that formation of this particles in plasma nitriding samples are due to sputtering of the surface during the process. With increasing thickness of the groove, frequency and duty cycle, roughness of surfaces raise. Also micro hardness rise with increasing the thickness of the groove and duty cycle resulting from the increase in percent of deposition particle nitride. The Hollow cathode phenomena occurred in sample with 2mm groove and 80% duty cycle in CPN. This will result in over heating of the sample which leads to a decrease hardness of the surface and an increasing in the Roughness of the surface. Then after the process plasma nitriding, the results of the pin on disk wear test showed that the nitrides coating have wear resistance better than the reference sample before treatment plasma nitriding.
[1] L. O. Rodrigo, O. P. Heloise, S. Vanessa, J. R. Israel, A. C. Silvia, A. Fernando, S. DE. Souza, A. Spinelli & A. Carlos, “Microstructure and corrosion behaviour of pulsed plasma-nitrided AISI H13 tool steel”, Corrosion Science, Vol. 204, pp. 3623-3628, 2010.
[2] M. Olzon-Dionysio, M. Campos & M. Kapp, S. DE. Souza, “Influences of plasma nitriding edge effect on properties of 316 L stainless steel, Surface and Coatings Technology”, Vol. 204, pp. 3623-3628, 2010.
[3] E. A. Ochoa, D. Wisnivesky, T. Minea, M. Ganciu, C. Tauziede, P. Chapon & F. Alvarez, “Microstructure and properties of the compound layer obtained by pulsed plasma nitriding in steel gear”, Surface & Coatings Technology, Vol. 1203, pp. 1457-61, 2009.
[4] N. P. Such & O. E. Kim, “On microscopic mechanism of friction and wear”, Wear, Vol. 146, pp. 199-208, 1991.
[5] W. Kovacs & W. Russell, “An introduction to ion nitriding- What is it? Why it is used? Where it is used?”, Ion Nitriding Conference Proceedings, Cleveland (OH), USA, Vol. 15, pp. 9-17, 1986.
[6] K. Ozbaysal & O. T. Inal, “Structure and properties of ion nitrided stainless steels”, Material Science and Engineering, Vol. 21, pp. 4318-4326, 1986.
[7] F. Ashrafizade, “Influence of Plasma and gaz nitriding on fatigue resistance of plain carbon steel, Surface and Coatings Technology”, Vol. 173-174, pp. 1196-1200, 2003.
[8] B. Y. Jeong & M. H. Kim, “Effect of pulse frequency and temperature on the nitride layer and surface characteristics of plasma nitrided stainless steel”, Surface and Coatings Technology, Vol. 137, pp. 249-254, 2001.
[9] G. H. Jeong, M. S. Hwang, Y. Jeong, M. Hokim & C. Lee, “Effect of the duty factor on the surface characteristics of the plasma nitride and diamond-like carbon coated high-speed steel”, Surface and Coatings Technology, Vol. 124, pp. 222-227, 2000.
[10] G. Nayal, DB. Lewis, M. Lembke & E. Cockremje, “Influence of sample geometry on the effect of pulse plasma nitriding of M2 steel”, Surface and Coatings Technology, Vol. 57, pp. 147, 1999.
[11] CZ. Li & T. Bell, “Principals mechanisms and applications of active screen plasma nitriding”, Heat Treatment of Metal, Vol. 30 pp. 1-7, 2003.
[12] L. Shen, L. Wang & J. Xu, “Plasma nitriding of AISI 304 austenitic stainless steel assisted with hollow cathode effect”, Surface & Coatings Technology, 2012.
[13] Z. Soltani Asadi & F. Mahboubi, “Effect of component geometry on the plasma nitriding behavior of AISI 4340”, Materials and Design, Vol. 49, pp. 1-6, 2011.
[14] C. Zaho, CX. Li, H. Dong & T. Bell, “Study on the active screen plasma nitriding and it is nitriding mechanism”, Surface and Coatings Technology, Vol. 201, pp. 15-20, 2006.
[15] SH. Ahangarani, AR. Sabour & F. mahboubi, “Surface modification of 30Cr Ni Mo8 low-alloy steel by active screen step and conventional plasma nitriding metods”, Surface and Coatings Technology, Vol. 254, pp. 27-35, 2007.
[16] M. Hutching, “Tribology, Friction and Wear of Engineering Materials”, Edward Arnold Pub, Great Britain, London, 1992.
[17] L. H. Chiu, C. F. Yang & P. M. Liu, “Wear resistance of JIS SKD61 tool steels with Cr based coatings”, Surface Engineering, Vol. 16, pp. 257-261, 2000.
[18] S. Y. Sirin, K. Sirin & E. Kaluc, “Effect of the ion nitriding surface hardening process on fatigue behavior of AISI 4340steel”, Material Characterization, Vol. 59, pp. 351-358, 2008.
[19] F. Mahboubi & K. Abdolvahabi, “The effect of temperature on plasma nitriding behavior of DIN 1.6959 low alloy steel”, Vacuum, Vol. 81, pp. 239-243, 2006.
