激光复合处理K24超合金表面残余应力

Residual stress of K24 superalloy surface by laser multiple processing

利用激光冲击技术对经激光淬火形成的K24超合金先进行了复合处理,用X-350A型X射线应力仪测定了激光复合处理区的残余应力,同时分析了复合处理区在500℃回火处理工艺后的残余应力变化规律,并对K24超合金复合处理区疲劳寿命的影响进行了研究。结果表明,激光冲击处理K24超合金淬火区后的残余压应力为600 MPa以上,经500℃回火处理81、6 h后残余应力仍然大于基体的残余压应力,其回火稳定性较好,有利于提高K24超合金的疲劳寿命。

The K24 superalloy specimens was treated by the laser multiple processing and its residual stresses were measured by a model X-350A X-ray stress tester. The measurement shows that the compressive residual stress of the laser multiple processed K24 superalloy surface exceeds 600 MPa, and after 8 and 16 h tempering treatment at 500 ℃, the residual stresses still exceed the average residual stress of the K24 base body,showing a good stability against the tempering,which is of help to improvement of the fatigue life of the K24 superalloy.