Plastic Behavior of Laser Cladding Sample under Repeated-Impact Load
Low stress repeated impact experiments and test were carded out on medium carbon steel and stainless steel samples which is clad with highstrength Co-based or Ni-based alloy. The results showed that under low stress repeated impact load, which is much lower than the yield strength of material, plastic deformation will be occurred on the coating and part of its below base material. The average plastic deformation degree caused by each impact is increased at first, and then declined with the increase of impact times. Accumulated impact will lead to macroscopic plastic deformation and material hardening. The degree of deformation and the size of deformation area are related to the impact stress value and the materials strength. The degree of deformation and hardening decline from the exterior to the interior, and only occur on the impact surface and a certain depth below, forming a deformable area. Based on our analysis, we consider that low stress repeated impact deformation is a kind of accumulative fatigue damage. The energy absorbed by material under repeated impact load, is larger than that absorbed at the same peak value of stress under static load or static fatigue load. Moreover, the energy absorbability is inversely proportional to the impact distance. Repeated impact may increase the movability of atom, reduce the critical shearing stress, that make the dislocation be initiated and increased easily.
Laser Cladding Repeated Impact Load Low Stress Plastic Behavior
S.H.Shi G.Y, Fu
College of Mechanical Electronic Engineering,Soochow University,Suzhou,215021,China
国际会议
常州
英文
294-298
2009-11-19（万方平台首次上网日期，不代表论文的发表时间）