摘要
选用不同涂层对QT700曲轴激光冲击处理,研究激光冲击强化条件下,QT700曲轴的硬度和表面残余应力等力学性能的变化.发现在激光冲击过程中,黑漆涂层、铝箔涂层和硅酸乙脂涂层均能有效提高冲击试样的表面硬度和表面应力.经过激光连续冲击后,在曲轴试件表面能形成1.0 mm厚的硬化层,其表面硬度最大能达到590 HV.激光脉冲功率从2.8 GW/cm2提高到3.6GW/cm2时,轴颈表面残余压应力相应由326 MPa提高到495 MPa,两次冲击后提高幅值更大.
Laser shock processing （LSP） employs high-energy laser pulses from a solid-state laser to create intense shock waves in a material. Three different coatings were used on QT700 crankshaft during laser shock processing. The effect of the laser shock processing on hardness and surface residual stress of QT700 crankshaft was studied. Three different ablative coatings, black paint, aluminum foil and silica acid black paint are used to protect QT700 crank shaft from surface melting by the laser pulse, which adversely increase surface hardness and surface residual stress. The depth of hardening by laser processing of QT700 crankshaft reaches to 1.0 mm, the surface hardness reaches to 590 HV after connective laser processing. When laser pulse energy density increases from 2.8 GW/cm^2 to 3.6 GW/cm^2, the surface residual stress of QT700 crankshaft increases from 326 MPa to 495 MPa. Fatigue life and abrasion of QT700 crank shaft increase obviously.
出处
《江苏大学学报（自然科学版）》
EI
CAS
北大核心
2007年第4期289-292,共4页
Journal of Jiangsu University：Natural Science Edition
基金
国家自然科学基金资助项目(50675089)
江苏省高校自然科学基础研究项目(07KJB460012)
关键词
QT700曲轴
激光冲击
残余应力
表面硬度
涂层
QT700 crankshaft
laser shock processing
residual stress
surface hardness
coating
作者简介
任旭东（1977-）。男，江苏南通人，讲师，博士研究生（renxd@ujs．edu．cn），主要从事激光冲击成形研究．
张永康（1963-），男，江苏张家港人，教授，博士生导师（ykzhang@ujs．edu．cn），主要从事激光冲击成形和激光无损检测研究
