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利用高功率、短脉冲Nd∶YAG激光对6061-T651铝合金进行表面冲击强化处理,并分别在200℃、300℃、400℃和500℃的温度下对其进行性能测试,从残余应力、显微硬度和微观组织等方面分析了激光冲击处理(LSP)对其在高温条件下性能的影响。研究结果表明中高温条件下激光冲击6061-T651铝合金的强化效果明显。200℃和400℃时试件的最大残余压应力出现在次表层,且温度越高残余压应力释放得越快,激光冲击硬化层深度约为0.3mm,500℃时的晶粒平均尺寸要比400℃时的大,晶粒尺寸和强化相是提高硬度的主要原因,不连续且粗大的晶界析出物提高了6061-T651铝合金的抗腐蚀性能。
The high-power, short-pulse Nd:YAG laser was used to perform the surface impact strengthening on 6061-T651 aluminum alloy. The properties of the aluminum alloy were tested at 200 ℃, 300 ℃, 400 ℃ and 500 ℃ respectively. The residual stress, Microhardness and microstructure of laser shock processing (LSP) on the performance of its performance at high temperature. The results show that under high temperature laser shock 6061-T651 aluminum alloy strengthening effect is obvious. The maximum residual compressive stress of the specimen appears at the subsurface at 200 ℃ and 400 ℃, and the higher the temperature is, the faster the residual compressive stress is released. The depth of the laser shock hardened layer is about 0.3mm. The average grain size at 500 ℃ The major, grain size and strengthening phase at 400 ℃ are the main reasons for increasing the hardness. The discontinuous and coarse grain boundary precipitates improve the corrosion resistance of 6061-T651 aluminum alloy.