Cause analysis of stress and fatigue damage of φ140 mm wearable steel ball
To analyze the causes of peeling under wire-cutting and early fatigue damage of 8MnSiCr steel φ140 mm wearable steel ball,the chemical composition,macro and micro structures of the ball were observed and analyzed.The results showed that the residual stress in the ball was not eliminated completely,the tensile stress of the ball surface was maximum.When the segregation caused martensitic transformation unsynchronized,the reheating impact of wire-cutting and the releases of thermal stress and structure stress led to the formation of the crack source in the defect site of larger stress.The crack expanded rapidly,then the peeling and early fatigue damage took place.By improving toughness of the balls,reducing defects and segregation,the residual stress could be reduced and the fatigue damage could be improved.
NETL
NSTL
万方数据
维普
