Influence of Compound Laser Life-extension Treatment onMechanical Properties of Key Parts of Pellet Traveling Grate

摘要

An new composite strengthening and prolongation technique was discussed on the key components of pellet travelinggrate, which are prone to thermal vibration fatigue, contact fatigue and wear resistance under the alternating high/lowtemperature. CO, laser remelting was used to subject the key components of pellet traveling grate, improving thematerial's surface hardness, and the advanced surface treatment technique by utilizing intense laser shockwave wasadopt. The impact of residual compressive stress generated by laser shock processing on fatigue life of surface crackswas discussed, and laser shock could effectively alleviate the residual stress at the surface and significantly improve thefatigue life and anti-stress corrosion performance. The result shows that composite laser treatment could effectively closeup and repair cracks.