While meeting the lightweight requirements of aerospace vehicles, titanium alloy parts also need to meet the requirements of long life and high reliability, which requires titanium alloy parts to have good fatigue resistance. However, medical titanium plate is a typical difficult-to-machine material. Adhesive wear of the tool during machining may cause complex surface stress. In addition, its poor thermal conductivity leads to a local temperature rise. Therefore, it is difficult to control the surface integrity of titanium alloy parts after machining. The industry uses a large number of anti-fatigue surface modifications (or surface deformation strengthening technology, Surfacemechanicaltreatment) to improve the surface integrity of titanium alloy parts, thereby achieving a long life and high-reliability requirements. In the anti-fatigue surface modification, mechanical shot peening (Shotpeening) and laser shock peening (Laser shock peening or Laserpeening) have strong structural adaptability and are widely studied in the industry. A series of researches have also been carried out on some surface strengthening technologies adapted to special structures, such as Cold expansion adapted to pore structures and Ultrasonic impact treatment or Ultrasonic impact peening adapted to welded structures.
No comments:
Post a Comment