An atomistic approach to the initiation mechanism of galling

Vitos, Levente; Larsson, Karin; Johansson, Börje; Hanson, Magnus; Hogmark, Sture

doi:10.1016/j.commatsci.2005.08.006

Cited by 34 publications

(20 citation statements)

References 19 publications

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“…Nevertheless, galling was not observed within the experimental accuracy according to the definition used throughout this work. A positive role of vanadium nitride in improving of galling resistance against steel has been reported repeatedly [5,[12][13][14], which implies a low adhesion between VN and steel. Therefore, it is assumed that the high volume fraction and distribution of vanadium nitride particles in the Vancron 40 material may have prevented the onset of galling.…”

Section: Discussionmentioning

confidence: 99%

“…In the research done by Vitos et al [5] on VN-Fe(001) and TiN-Fe(001) systems, a better galling performance of VN coatings was predicted. These findings are in good agreement with experimental results, where VN coatings give a better resistance against work material transfer than TiN coatings in sliding against steel [14,15].…”

Section: Introductionmentioning

confidence: 94%

“…By polishing, to remove irregularities and asperities that can act as initiation sites for work material transfer [1,4], the tools life is considerably prolonged in both lubricated and unlubricated systems [3,[5][6][7]. Further, galling can be successfully hindered by modification of the tools surface by PVD or CVD coatings.…”

Section: Introductionmentioning

confidence: 98%

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Galling resistance and wear mechanisms – cold work tool materials sliding against carbon steel sheets

et al. 2006

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One of the major causes for tool failure in sheet metal forming is transfer and accumulation of adhered sheet material to the tool surfaces, generally referred to as galling. In the present work, the galling resistance of several tool materials was investigated against two-phase ferritic-martensitic carbon steel under dry sliding test conditions. Tribological evaluation was carried out at different contact pressures by using a slider-on-flat-surface (SOFS) tribometer. For all selected test conditions, a consistent ranking of the materials was obtained with best performance observed for nitrogen alloyed powder metallurgy tool steel. Worst galling resistance was observed by nodular cast iron.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 94%

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Galling resistance and wear mechanisms – cold work tool materials sliding against carbon steel sheets

et al. 2006

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“…The occurrence of galling has been widely reported in case of sliding of uncoated high-purity titanium against titanium alloys in unlubricated tests. [24][25][26][27] Based on the results from a number of wear tests on uncoated titanium, Wiklund and Hutchings were able to identify the onset of galling at a load as low as 5 N. [24] In the present study, a much higher load of 10 N has been used and this might have helped galling to occur in titanium/steel tribosystem. The SEM results verify the occurrence of the galling of titanium under the given set of test conditions.…”

Section: B Tribomechanical Stress-assisted Deformation and Damagementioning

confidence: 95%

Understanding Friction and Wear Mechanisms of High-Purity Titanium against Steel in Liquid Nitrogen Temperature

Basu

Sarkar²,

Mishra

2008

Metall Mater Trans A

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Although the friction and wear properties of several metallic alloys in unlubricated conditions are widely investigated, such understanding for high-purity metals in cryogenic environment is rather limited. This article reports the tribological properties of high-purity a-titanium (a-Ti), prepared by cold rolling and recrystallization annealing, under liquid nitrogen (LN2) and room temperature (RT) environments against steel (bearing grade: SAE 52100) at varying loads (up to 15 N) and sliding speeds (0.6 to 4.19 m/s). It has been found that the steady-state coefficient of friction (COF) of titanium under LN2 environment (~0.27 to 0.33) is lower than that at RT COF (~0.33 to 0.58) irrespective of sliding speed. For cryogenic sliding conditions, the COF decreased steadily with sliding speed to a mean value of about 0.28 and no appreciable variation in COF is noticed for sliding speed of more than 1.5 m/s. The wear rate under both environment conditions was of the order of 10 -3 mm 3 N -1 m -1 irrespective of variation in operating parameters, but the RT wear rate was found to be higher compared to the LN2 case. Overall, the experimental results demonstrate improved tribological properties of high-purity titanium at LN2 temperature compared to the RT. Flow localization at tribological interfaces because of the large strain rate and subsequent damage accumulation at the titanium test piece are some of the attributes of the wear of Ti at LN2 temperature. In addition, the galling of titanium was also observed to occur under large contact stress and sliding speed conditions.

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“…However, the reported research on the TiN/Fe interfaces consists of only few studies of the separation of the TiN(001)/bcc Fe(001) system [8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%