Influence factors of cracks formation on surface of copper bearing steel during deformation
LI Chang- rong1,2,ZHANG Lei1,2,LIU Ran1
（1. College of Materials and Metallurgy， Guizhou University， Guiyang 550025， Guizhou， China 2. The Key Laboratory of Metallurgical Engineering and Energy Conservation of Guizhou Province， Guiyang 550025， Guizhou， China）
Abstract：In order to reduce the surface crack in copper bearing steel and suppress the copper brittleness, the influence factors of surface crack in copper bearing steel were studied by controlling the copper mass fraction, deformation temperature, oxidation time and deformation amount in the process of deformation. The results showed that the higher copper mass fraction, the more serious the surface crack. The maximum crack of the steel with different copper mass fraction had a certain critical temperature, which was in the range of temperature of 1 100- 1 150 ℃. And the longer the oxidation time, the deeper the crack depth. Deformation of 42% was the critical point of a large number of cracks on the surface of the sample. The number of cracks increased rapidly with the increase of the deformation. When the deformation rate was 50%, the crack increase speed would slow down and eventually reach saturation.
2017, Vol. 27 
