Study on Friction Properties of Spray Deposited 7075 Aluminium Alloy Drill
Author of the article:TANan Heng;WANG Ze;YAO Yuanyuan;SUN Zhijuan;LI Xiaoping;TAN Wensheng;YAN Chenkai
Author's Workplace：School of Material Engineering,Jiangsu University of Technology,Jiangsu Key Laboratory of Advanced Materials Design and Additive Manufacturing,Changzhou 213001,China;Changzhou Key Laboratory of Large Plastic Parts Intelligence Manufacturing,Changzhou College of Information Technology,Changzhou 213164,China
Key Words：7075 aluminum alloy spray-deposition drill pipe solid solution aging treatment friction properties
Abstract：
7075 aluminum alloy as a drill pipe is widely used in oil and gas drilling, the study of 7075 aluminum alloy friction performance is of great significance. In this paper, 7075 aluminum alloy blanks with uniform grain size were prepared by spray-deposition technology. The average particle size was about 10 μm. Secondly, Drill pipe was extruded at520 ℃ in the semi-solid and then treated by solid solution+failure, the solution temperature is 490±5 ℃, holding time is 12 hours. Finally, the influence of load and velocity on friction coefficient and wear scar was tested under dry friction condition by high temperature friction and wear tester. The experimental results show that under the dry friction condition,the wear extent and the friction coefficient increase with the increase of the load and velocity, and the load has a greater effect on the wear extent and the friction coefficient. Wear mechanism: When the load is less than the critical value of 15 N, wear mechanism dominated by plastic deformation, from plastic deformation into furrow and stripping wear. When the load is greater than 15 N, wear mechanism dominated by the oxidation wear, from plastic deformation into oxidative wear and stripping wear. When the velocity is less than the critical value of 600 r/min, the wear mechanism is dominated by plastic deformation, the greater the speed, the stronger the softening of the material, the stronger the furrow effect caused by the plastic deformation. When the speed is greater than 600 r/min, the wear mechanism is dominated by oxidative wear and stripping wear, from slight wear to severe wear and slight wear.
