Synergy Effect of Ultrasonic Nanocrystalline Surface Modification and Laser Surface Texturing on Friction and Wear Behavior of Graphite Cast Iron

Abstract

An ultrasonic nanocrystalline surface modification (UNSM) process followed by laser surface texturing (LST) was applied to graphite cast iron to improve the friction and wear behavior. The surface hardness of the UNSM-treated and UNSM + LST-treated specimens was increased significantly compared to the polished and the LST-treated specimens. The friction and wear behavior of the specimens was assessed using a ball-on-disk friction tester at an applied load of 10 N and a speed of 5cm/s in both dry and lubrication conditions. The friction coefficient of the UNSM-, LST-and the UNSM+LST-treated specimens reduced in both dry and lubrication conditions compared to the polished specimen by 64, 30, and 64%, and 63, 67, and 75%, respectively. In lubrication condition, the friction coefficient of the UNSM-and LST-treated specimens was further reduced by about 30 and 25% by UNSM+LST processes. In dry Downloaded by [University of Kentucky Libraries] at 00:44 25 June 2016 ACCEPTED MANUSCRIPT ACCEPTED MANUSCRIPT 2condition, the UNSM+LST-treated specimen exhibited a reduction in the friction coefficient of 46% compared to the LST-treated specimen, whereas no reduction in friction coefficient was found compared to the UNSM-treated specimen. The wear resistance of the UNSM-, LST-and the UNSM + LST-treated specimens was enhanced by 22%, 11%, and 37% in the dry condition, respectively whereas a minuscule wear was observed in lubrication condition that was difficult to quantify in our experiment. The synergy effect of UNSM and LST processes was effectively combined to improve the friction and wear behavior of graphite cast iron.

Graphene Coating via Chemical Vapor Deposition for Improving Friction and Wear of Gray Cast Iron at Interfaces

“…The lower friction for the uncoated specimen after a few minutes of sliding is due to the lubricative nature of uniformly distributed graphite flakes to some extent. [2][3][4]6 Then, the friction of the uncoated specimen became unstable and higher. As we already reported in our study, the effect of the graphite flakes remains until and unless the flakes chip-out completely.…”

“…As we already reported in our study, the effect of the graphite flakes remains until and unless the flakes chip-out completely. 6 Holes and cracks may appear due to the chipping out of the flakes from their respective positions. These holes and cracks appeared in the contact region make the surface rougher and resulted in an unstable and higher friction.…”

“…Relatively low friction and wear of the material is mainly due to the uniform distribution of the graphite flakes on the materials as discussed in previous studies. , The graphite flake behaves as a solid lubricating additive on the surface. However, there is much scope for the improvement in friction and wear of the material by employing the surface modification processes such as laser surface texturing , and ultrasonic nanocrystalline surface modification as explained in our previous studies. Currently, many studies have focused on thin-film coatings and achieved an excellent improvement in the friction and wear .…”

Surface Texture-Based Surface Treatments on Ti6Al4V Titanium Alloys for Tribological and Biological Applications: A Mini Review

“…While under the negative effects of friction in normal applications, the service performance of Ti6Al4V engineering components would be decreased and then the lifecycle of the whole equipment might also be reduced [ 100 , 101 ]. Surface texture-based surface treatments developed by different scientists and engineers have provided promising approaches to overcome the relevant issues [ 42 , 43 , 44 , 45 , 46 , 47 , 48 , 49 , 50 , 51 , 52 , 53 , 54 , 55 , 56 , 57 , 58 , 59 , 60 , 61 , 62 , 63 , 64 , 65 , 66 , 67 , 68 , 69 , 70 , 71 , 72 , 73 , 74 , 75 , 76 , 77 , 78 , 79 , 80 , 81 , 82 , 83 , 84 , 85 , 86 , 87 , 88 ,…”

“…With the advantages of surface modification technologies and surface texturing in improving the tribological performance of materials, some duplex treatments of surface modification-surface texturing have been developed. One kind is the “surface texturing + surface modification”, the other kind is the “surface modification + surface texturing”, as shown in Figure 2 [ 63 , 64 , 65 , 66 , 67 , 68 , 69 , 70 , 71 , 72 , 73 , 74 , 75 , 76 ]. These works have created a database and provided reference information for practical applications of surface modification-surface texturing duplex treatments.…”