Abstract
Current work analyses the effect of laser shock peening on four different chromium based electrochemical coatings i.e. Cr coating, Cr reinforced with 3 mol% yttria stabilized zirconia nanoparticles i.e. Cr-YSZ, Cr reinforced with carbon nanotubes i.e. Cr-CNT, and synergistic reinforcement of YSZ and CNT in Cr i.e. Cr-YSZ-CNT. The coatings were prepared in order to improve mechanical properties as well as wear resistance for gun barrel applications. Cr coating exhibited an increase in hardness from ~8 GPa to ~9.4 GPa and maximum hardness value of up to ~26 GPa was observed for Cr-YSZ-CNT as a result of laser peening. The enhanced hardness can be ascribed to high compressive residual stresses ranging from ~634–1757 MPa, induced by laser shock peening treatment. Fretting wear test results into minimum wear rate of ~1.8 × 10−5 mm3/Nm for Cr-YSZ-CNT, also maximum dislocation density of ~3.0 × 1012 cm−2 which accrue on synergistic reinforcement with YSZ and CNT. The overall performance of coatings in terms of mechanical and tribological properties improved after laser peening, indicated by reduction in wear constant of composite coatings by three orders of magnitude in comparison to that of un-peened Cr coating. YSZ incorporation leads to the Cr matrix strengthening and multifunctional nature of CNTs leads to lubrication of the matrix. Also, intense network of CNTs inhibits the crack propagation. In the nut shell, collaborative role of YSZ and CNT in Cr matrix in addition to laser peening treatment result in establishing Cr-YSZ-CNT as superior coating material competent to limit the problems of wear and erosion not only in defence sector but its applicability can be extended to various fields such as aerospace, automotive, gas turbines, etc.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
