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 ENG  Vol.3 No.9 , September 2011
Effects of Gas Nitriding on the Mechanical and Corrosion Properties of SACM 645 Steel
Abstract: The effects of the nitrided case produced by gas nitriding processes on the mechanical and corrosion resistance properties of the JIS SACM 645 steel were studied in this paper. JIS SACM 645 steel specimens with different substrate hardness were gas nitrided at 530?C for various nitriding durations. Nitrided specimens were characterized by means of optical and scanning electron microscopy, X-ray diffraction, glow discharge optical spectrometry, microhardness profiling, wear test, torsion mode fatigue test as well as electrochemical corrosion test in an aerated 3.5% NaCl solution. The surface hardness values of the nitrided specimens with Fe3N and Fe4N phases precipitated in the case layer were observed higher than 1000 HV0.1. Mass loss measurement of the wear test showed increases of wear resistance of the nitrided specimens, and the mass losses of the specimens were strongly influenced by nitriding durations. Electrochemical measurements showed that corrosion current density of the specimens was significantly decreased after nitriding and the corrosion potential was shifted to the noble direction as the increase of the nitriding durations. The fatigue limit of the specimen nitrided for 96 h rose 44% to 600 MPa in exceeding the untreated specimen in this study.
Keywords: Nitriding, Steel, Wear, Fatigue
Cite this paper: nullS. Yeh, L. Chiu and H. Chang, "Effects of Gas Nitriding on the Mechanical and Corrosion Properties of SACM 645 Steel," Engineering, Vol. 3 No. 9, 2011, pp. 942-948. doi: 10.4236/eng.2011.39116.
References

[1]   C. M. Suh and H. K. Jang, “Effects of Surface Hardening and Residual Stress on the Fatigue Characteristics of Nitrided SACM 645 Steel,” International Journal of Modern Physics B, Vol. 17, No. 8-9, 2003, pp. 1633-1639.

[2]   C. M. Suh, J. K. Hwang, K. S. Son and H. K. Jang, “Fatigue Characteristics of Nitrided SACM 645 According to the Nitriding Condition and Notch,” Materials Science and Engineering A, Vol. 392, No. 1-2, 2005, pp. 31-37. doi:10.1016/j.msea.2004.07.066

[3]   J. Baranowskaa and S. E. Franklin, “Characterization of Gas-Nitrided Austenitic Steel with an Amorphous/ Nanocry-Stalline Top Layer,” Wear, Vol. 264, No. 9-10, 2008, pp. 899-903.

[4]   S. Abisset, F. Maury, R. Feurer, M. Ducarroir, M. Nadal and M. Andrieux, “Gas and Plasma Nitriding Pretreatments of Steel Substrates before CVD Growth of Hard Refractory Coatings,” Thin Solid Films, Vol. 315, No. 1-2, 1998, pp. 179-185. doi:10.1016/S0040-6090(97)00787-6

[5]   C. Allen, C. X. Li, T. Bell and Y. Sun, “The Effect of Fretting on the Fatigue Be-haviour of Plasma Nitrided Stainless Steels,” Wear, Vol. 254, No. 11, 2003, pp. 1106-1112.

[6]   K. Genel, M. Demirkol and M. Capa, “Effect of Ion Nitriding on Fatigue Behaviour of AISI 4140 Steel,” Materials Science and Engineering A, Vol. 279, No. 1-2, 2000, pp. 207-216. doi:10.1016/S0921-5093(99)00689-9

[7]   N. Limodin and Y. Verreman, “Fatigue Strength Improvement of a 4140 Steel by Gas Nitriding: Influence of Notch Severity,” Materials Science and Engineering A, Vols. 435-436, 2006, pp. 460-467. doi:10.1016/j.msea.2006.07.034

[8]   A. Celik and S. Karadeniz, “Improvement of the Fatigue Strength of AISI 4140 Steel by an Ion Nitriding Process,” Surface and Coatings Technology, Vol. 72, No. 3, 1995, pp. 169-173. doi:10.1016/0257-8972(94)02348-4

[9]   J. H. Sung, J. H. Kong, D. K. Yoo, H. Y. On, D. J. Lee and H. W. Lee, “Phase Changes of the AISI 430 Ferritic Stainless Steels after High-Temperature Gas Nitriding and Tempering Heat Treat-ment,” Materials Science and Engineering A, Vol. 489, 2008, pp. 38-43.

[10]   H. W. Lee, J. H. Kong, D. J. Lee, H. Y. On and J. H. Sung, “A Study on High Temperature Gas Nitriding and Tempering Heat Treatment in 17Cr–1Ni–0.5C,” Materials & Design, Vol. 30, No. 5, 2009, pp. 1691-1696.

[11]   D. Q. Peng, T. H. Kim, J. H. Chung and J. K. Park, “Development of Ni-tride-Layer of AISI 304 Austenitic Stainless Steel during High-Temperature Ammonia Gas-Nitriding,” Applied Surface Science, Vol. 256, No. 24, 2010, pp. 7522-7529. doi:10.1016/j.apsusc.2010.05.100

[12]   F. Ashrafizadeh, “In-fluence of Plasma and Gas Nitriding on Fatigue Resistance of Plain Carbon (Ck45) Steel,” Surface and Coatings Technology, Vols. 174-175, 2003, pp. 1196-1200. doi:10.1016/S0257-8972(03)00460-2

[13]   M. Pellizzari, A. Molinari and G. Straffelini, “Thermal Fatigue Resistance of GAS and Plasma Nitrided 41CrAlMo7 Steel,” Materials Sci-ence and Engineering, Vol. A352, 2003, pp. 186-194.

[14]   CNS: 14288-G2272, 2006, 1-6.

[15]   P. Buch-hagen and T. Bell, “Simulation of the Residual Stress Devel-opment in the Diffusion Layer of Low Alloy Plasma Nitrided Steels,” Computational Materials Science, Vol. 7, No. 1-2, 1996, pp. 228-234. doi:10.1016/S0927-0256(96)00085-7

[16]   S. H. Yeh, L. H. Chiu and H. Chang, “Influence of Vacuum Heat Treatment an Salt-Bath Nitrocarburization on the Corrosion Behavior of JIS SKD61 and DH31S Hot Work Steels,” Advanced Materials Research, Vol. 47-50, 2008, pp. 686-689.

[17]   K. Hussain, A. Tauqir, A. Haq and A. Q. Khan, “Influence of Gas Nitriding on Fatigue Resistance of Maraging Steel,” International journal of fatigue, Vol. 21, No. 2, 1999, pp. 163-168. doi:10.1016/S0142-1123(98)00063-2

[18]   R. L. O. Basso, R. J. Candal, C. A. Figueroa, D. Wisnivesky and F. Alvarez, “Influ-ence of Microstructure on the Corrosion Behavior of Nitrocar-burized AISI H13 Tool Steel Obtained by Pulsed DC Plasma,” Surface and Coatings Technology, Vol. 203, No. 10-11, 2009, pp. 1293-1297. doi:10.1016/j.surfcoat.2008.10.006

 
 
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