Nitrogen implantation in Interstitial-Free steel was evaluated for its impact on metal transfer and 1100 Al rider wear. It was determined that nitrogen implantation reduced metal transfer in a trend that increased with dose; the Archard wear coefficient reductions of two orders of magnitude were achieved using a dose of 2e17？ions/cm2, 100？kV. Cold-rolling the steel and making volumetric wear measurements of the Al-rider determined that the hardness of the harder material had little impact on volumetric wear or friction. Nitrogen implantation had chemically affected the tribological process studied in two ways: directly reducing the rider wear and reducing the fraction of rider wear that ended up sticking to the ISF steel surface. The structure of the nitrogen in the ISF steel did not affect the tribological behavior because no differences in friction/wear measurements were detected after postimplantation heat treating to decompose the as-implanted ε-Fe3N to γ-Fe4N. The fraction of rider-wear sticking to the steel depended primarily on the near-surface nitrogen content. Covariance analysis of the debris oxygen and nitrogen contents indicated that nitrogen implantation enhanced the tribo-oxidation process with reference to the unimplanted material. As a result, the reduction in metal transfer was likely related to the observed tribo-oxidation in addition to the introduction of nitride wear elements into the debris. The primary Al rider wear mechanism was stick-slip, and implantation reduced the friction and friction noise associated with that wear mechanism. Calculations based on the Tabor junction growth formula indicate that the mitigation of the stick-slip mechanism resulted from a reduced adhesive strength at the interface during the sticking phase. 1. Introduction Metal transfer is an insidious process occurring during sliding of metallic contacts that can result in galling [1, 2] as defined by ASTM [3]. The traditional model of metal transfer usually starts with adhesive wear events between interacting asperities. Fractured metal from the cohesively weaker material transfers to the stronger material. As a result, small particles or “transfer elements” of transferred material are stuck on the harder materials surface. The individual fragments of the transferred material resulting from an isolated tribo-interaction are known as “transfer elements.” A transfer element acts like an additional asperity that can continue to interact with the softer material and build-up into a multi-particle debris through a process known as “Mutual Material Transfer” [4,
References
[1]
H. Wallin, An investigation of friction graphs ranking ability regarding the galling phenomenon in dry SOFS contact [Thesis], Faculty of Technology and Science Department of Material Science Karlstad University.
[2]
J. T. Burwell and C. D. Strang, “Metallic Wear,” Proceedings of the Royal Society of London A, vol. 212, Mathematical and Physical Sciences, no. 1111, pp. 470–477, 1952.
[3]
ASTM G98-02, 2009, Standard test method for galling resistance of materials.
[4]
T. Sasada and S. Norose, “Formation and growth of wear particles through mutual material transfer,” in Proceedings of the JSLE-ASLE International Lubrication Conference, pp. 82–91, American Elsevier Publishing, New York, NY, USA, 1976.
[5]
A. Hase and H. Mishina, “Wear elements generated in the elementary process of wear,” Tribology International, vol. 42, no. 11-12, pp. 1684–1690, 2009.
[6]
A. G？？rd, P. Krakhmalev, and J. Bergstr？m, “Wear mechanisms in galling: cold work tool materials sliding against high-strength carbon steel sheets,” Tribology Letters, vol. 33, no. 1, pp. 45–53, 2009.
[7]
S. R. Hummel and B. Partlow, “Comparison of threshold galling results from two testing methods,” Tribology International, vol. 37, no. 4, pp. 291–295, 2004.
[8]
S. R. Hummel, “Development of a galling resistance test method with a uniform stress distribution,” Tribology International, vol. 41, no. 3, pp. 175–180, 2008.
[9]
U. Wiklund and I. M. Hutchings, “Investigation of surface treatments for galling protection of titanium alloys,” Wear, vol. 251, no. 1–12, pp. 1034–1041, 2001.
[10]
S. R. Hummel, “An application of frictional criteria for determining galling thresholds in line contact tests,” Tribology International, vol. 35, no. 12, pp. 801–807, 2002.
[11]
I. L. Singer, “Surface analysis, ion implantation and tribological processes affecting steels,” Applied Surface Science, vol. 18, no. 1-2, pp. 28–62, 1984.
[12]
J. K. Hirvonen, C. A. Carosella, R. A. Kant, I. Singer, R. Vardiman, and B. B. Rath, “Improvement of metal properties by ion implantation,” Thin Solid Films, vol. 63, no. 1, pp. 5–10, 1979.
[13]
T. Fujihana, Y. Okabe, and M. Iwaki, “Effects of implantation temperature on the hardness of iron nitrides formed with high nitrogen dose,” Nuclear Instruments and Methods in Physics Research Section B, vol. 39, no. 1–4, pp. 548–551, 1989.
[14]
T. Fujihana, A. Sekiguchi, Y. Okabe, K. Takahashi, and M. Iwaki, “Effects of room temperature carbon, nitrogen and oxygen implantation on the surface hardening and corrosion protection of iron,” Surface and Coatings Technology, vol. 51, no. 1–3, pp. 19–23, 1992.
[15]
H. Dimigen, K. Kobs, R. Leutenecker, H. Ryssel, and P. Eichinger, “Wear resistance of nitrogen-implanted steels,” Materials Science and Engineering, vol. 69, no. 1, pp. 181–190, 1985.
[16]
A. A. Youssef, P. Budzynski, J. Filiks, A. P. Kobzev, and J. Sielanko, “Improvement of wear and hardness of steel by nitrogen implantation,” Vacuum, vol. 77, no. 1, pp. 37–45, 2004.
[17]
W. C. Oliver, R. Hutchings, and J. B. Pethica, “The wear behavior of nitrogen-implanted metals,” Metallurgical and Materials Transactions A, vol. 15, no. 12, pp. 2221–2229, 1984.
[18]
P. Tarkowski, P. Budzynski, and W. Kasietczuk, “Adhesive character of wear processes in nitrogen-implanted iron,” Vacuum, vol. 78, no. 2–4, pp. 679–683, 2005.
[19]
R. Wei, P. J. Wilbur, W. S. Sampath, D. L. Williamson, and J. L. Wang, “Effects of Ion implantation conditions on the tribology of ferrous surfaces,” Tribology, vol. 113, pp. 166–173, 1991.
[20]
I. M. Feng, “Metal transfer and wear,” Journal of Applied Physics, vol. 23, no. 9, pp. 1011–1019, 1952.
[21]
D. A. Rigney, “The roles of hardness in the sliding behavior of materials,” Wear, vol. 175, no. 1-2, pp. 63–69, 1994.
[22]
C. C. Viáfara and A. Sinatora, “Influence of hardness of the harder body on wear regime transition in a sliding pair of steels,” Wear, vol. 267, no. 1–4, pp. 425–432, 2009.
[23]
D. W. Borland and S. Bian, “Unlubricated sliding wear of steels: towards an alternative wear equation,” Wear, vol. 209, no. 1-2, pp. 171–178, 1997.
[24]
D. Tabor, “Junction growth in metallic friction: the role of combined stresses and surface contamination,” Proceedings of the Royal Society of London A, vol. 251, no. 1266, pp. 378–393, 1959.
[25]
D. Rafaja, “X-ray diffraction and X-ray reflectivity applied to the investigation of thin films,” Advances in Solid State Physics, vol. 41, pp. 275–286, 2001.
[26]
M. Kopcewicz and J. Jagielski, “Phase transformations in nitrogen-implanted α-iron,” Journal of Applied Physics, vol. 71, no. 9, pp. 4217–4226, 1992.
[27]
A. A. Youssef, P. Budzynski, J. Filiks, A. P. Kobzev, and J. Sielanko, “Improvement of wear and hardness of steel by nitrogen implantation,” Vacuum, vol. 77, no. 1, pp. 37–45, 2004.
[28]
G. Bhargava, I. Gouzman, C. M. Chun, T. A. Ramanarayanan, and S. L. Bernasek, “Characterization of the “native” surface thin film on pure polycrystalline iron: a high resolution XPS and TEM study,” Applied Surface Science, vol. 253, no. 9, pp. 4322–4329, 2007.
[29]
N. P. Suh, N. Saka, and S. Jahanmir, “Implications of the delamination theory on wear minimization,” Wear, vol. 44, no. 1, pp. 127–134, 1977.
[30]
T. Kayaba, K. Kato, and K. Hokkirigawa, “Theoretical analysis of the plastic yielding of a hard asperity sliding on a soft flat surface,” Wear, vol. 87, no. 2, pp. 151–161, 1983.
[31]
M. Fishkis, “Metal transfer in the sliding process,” Wear, vol. 127, no. 1, pp. 101–110, 1988.
[32]
R. L. Jackson and I. Green, “A finite element study of elasto-plastic hemispherical contact against a rigid flat,” Journal of Tribology, vol. 127, no. 2, pp. 343–354, 2005.
[33]
L. Kogut and I. Etsion, “A finite element based elastic-plastic model for the contact of rough surfaces,” Tribology Transactions, vol. 46, no. 3, pp. 383–390, 2003.
[34]
M. Antler, “Processes of metal transfer and wear,” Wear, vol. 7, no. 2, pp. 181–203, 1964.
[35]
M. Antler, “Wear, friction, and electrical noise phenomena in severe sliding systems,” ASLE Transactions, vol. 5, no. 2, pp. 297–307, 1962.
[36]
A. D. Berman, W. A. Ducker, and J. N. Israelachvili, “Origin and characterization of different stick-slip friction mechanisms,” Langmuir, vol. 12, no. 19, pp. 4559–4562, 1996.
[37]
T. Sasada, M. Oike, and N. Emori, “The effect of abrasive grain size on the transition between abrasive and adhesive wear,” Wear, vol. 97, no. 3, pp. 291–302, 1984.
[38]
D. A. Rigney, L. H. Chen, M. G. S. Naylor, and A. R. Rosenfield, “Wear processes in sliding systems,” Wear, vol. 100, no. 1–3, pp. 195–219, 1984.
[39]
D. A. Rigney, “Sliding wear of metals,” Annual Review of Materials Science, vol. 18, pp. 141–163, 1988.
[40]
J. Jiang, F. H. Stott, and M. M. Stack, “A mathematical model for sliding wear of metals at elevated temperatures,” Wear, vol. 181–183, no. 1, pp. 20–31, 1995.
[41]
R. L. Deuis, C. Subramanian, and J. M. Yellup, “Dry sliding wear of aluminium composites—a review,” Composites Science and Technology, vol. 57, no. 4, pp. 415–435, 1997.
[42]
I. M. Hutchings, Tribology: Friction and Wear of Engineering Materials, Arnold, London, UK, 1992.
[43]
H. J. Kim, A. Emge, S. Karthikeyan, and D. A. Rigney, “Effects of tribooxidation on sliding behavior of aluminum,” Wear, vol. 259, no. 1–6, pp. 501–505, 2005.
[44]
P. Budzynski, A. A. Youssef, Z. Surowiec, and R. Paluch, “Nitrogen ion implantation for improvement of the mechanical surface properties of aluminum,” Vacuum, vol. 81, no. 10, pp. 1154–1158, 2007.
[45]
A. Galerie, M. Caillet, and M. Pons, “Oxidation of ion-implanted metals,” Materials Science and Engineering, vol. 69, no. 2, pp. 329–340, 1985.
[46]
G. Dearnaley, “The alteration of oxidation and related properties of metals by ion implantation,” Nuclear Instruments and Methods, vol. 182-183, no. 2, pp. 899–914, 1981.
[47]
K. M. Jasim and E. S. Dwarakadasa, “SEM studies of wear debris in Al-Si alloys,” Journal of Materials Science Letters, vol. 8, no. 11, pp. 1285–1287, 1989.
[48]
H. J. Cho, W. J. Wei, H. C. Kao, and C. K. Cheng, “Wear behavior of UHMWPE sliding on artificial hip arthroplasty materials,” Materials Chemistry and Physics, vol. 88, no. 1, pp. 9–16, 2004.
[49]
K. M. Jasim and E. S. Dwarakadasa, “Effect of sliding speed on adhesive wear of binary Al-Si alloys,” Journal of Materials Science Letters, vol. 12, no. 9, pp. 650–653, 1993.
[50]
U. Beerschwinger, T. Albrecht, D. Mathieson, R. L. Reuben, S. J. Yang, and M. Taghizadeh, “Wear at microscopic scales and light loads for MEMS applications,” Wear, vol. 181–183, no. 1, pp. 426–435, 1995.
