摘要
飞锤是发动机的重要部件,针对飞锤在发动机燃油喷射系统中作高速旋转运动,并受交变应力的影响,容易发生疲劳断裂这一问题,使用波长为1.06μm,脉宽为23ns的激光冲击飞锤成品零件的危险截面部位,用水作为激光冲击的约束层材料.冲击后,受冲击部位没有明显的宏观变形,但显微硬度提高了大约20%;显微结构发生了显著的变化;抗疲劳断裂时间得到了延长,转动强化交变应力试验1500小时后仍未断裂.试验证明采用激光冲击强化技术,能在不增加飞锤的重量和不改变飞锤的宏观外形的条件下,有效提高飞锤的抗疲劳断裂性能,适合于实际生产.
Flying hammer plays an important role in engine system. It rotates with high speed in fuel in- jection system and is affected by alternating stress which causes fatigue fracture in critical section easily. To solve this problem, a laser with 1.06μm wavelength and 23 ns FMWH was used to shock the flying hammer＇ s critical section with water overlay. After laser shock processing, the shock zone has no obvious macro deformation, but the microhardness was improved by about 20%. Micro structure was also transformed and fatigue strength was increased. Fatigue fracture had not happened after 1 500 hours enhanced alternating stress experiment. The experiment indicates that laser shock processing is applicable to the industrial products.
出处
《江苏大学学报（自然科学版）》
EI
CAS
北大核心
2005年第5期369-371,共3页
Journal of Jiangsu University：Natural Science Edition
基金
国家自然科学基金资助项目(50275068)
国家高技术研究发展计划项目(2002AA421120
2002AA336030)
关键词
飞锤
激光冲击强化
危险截面
抗疲劳强度
flying hammer
laser shock processing
critical section
fatigue strength
