Distribution law of damage for chrome coating in tank gun barrel
The use of chrome plating technology on the inner bore of an artillery barrel can effectively improve its service life.The damage patterns of chrome-plated barrels and non-chrome-plated barrels are not consistent.This paper employs a combination of theoretical calculations and physicochemical property analysis to investigate the damage degradation pattern of the chrome layer in chrome-plated barrels after multiple firings.Theoretical studies find that the barrel ablation wear is mainly concentrated on the forced cone and the beginning of the rifling and the maximum pressure zone.The peak ablation wear on the barrel chamber is 0.22 mm for 500 projectiles.Following this,after completing over 700 shots,the change in the diameter of the lands within the barrel is measured,and the relationship between the number of shots and the cumulative increase in the barrel bore diameter at the muzzle is statistically analyzed to judge chrome layer peeling.Finally,at the starting point of the rifling and the maximum pressure zone,characteristic points are selected for microscopic morphology observation,and the mass fraction of surface element is obtained.Comprehensive analysis of theoretical calculations and physicochemical properties indicates that the pressure and temperature conditions are severest at the starting point of the rifling and the maximum pressure zone,leading to evident chrome layer peeling.From the maximum pressure zone to the barrel muzzle,the extent of chrome layer peeling gradually decreases.This study provides a certain technical reference for revealing the damage patterns and failure mechanisms of the chrome layer inside the barrel.
barrel borechrome layer damagerifling starting pointmaximum pressure zone
万方数据
维普
