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首页> 外文期刊>Journal of Materials Engineering and Performance >Low cost corrosion damage mitigation and improved fatigue performance of low plasticity burnished 7075-T6
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Low cost corrosion damage mitigation and improved fatigue performance of low plasticity burnished 7075-T6

机译：低成本的腐蚀损伤减轻和低塑性抛光7075-T6的改善的疲劳性能

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摘要

Low plasticity burnishing (LPB) has been investigated as a surface enhancement process and corrosion mitigation method for aging aircraft structural applications. Compressive residual stresses reaching the alloy yield strength and extending to a depth of 1.25 mm (0.050 in.) deeper than typical corrosion damage is achievable. Excellent surface finish can be achieved with no detectable metallurgical damage to surface and subsurface material. Salt fog exposures of 100 and 500 h reduced the fatigue strength at 2 × 10{sup}6 cycles by 50%. The LPB of the corroded surface, without removal of the corrosion product or pitted material, restored the 2 × 10{sup}6 fatigue strength to greater than that of the original machined surface. The fatigue strength of the corroded material in the finite life regime (10{sup}4 to 10{sup}6 cycles) after LPB was 140 MPa (20 ksi) higher than the original uncorroded alloy and increased the life by an order of magnitude. Ease of adaptation to computer numerical control (CNC) machine tools allows LPB processing at costs and speeds comparable to machining operations. Low plasticity burnishing offers a promising new technology for mitigation of corrosion damage and improved fatigue life of aircraft structural components with significant cost and time savings over current practices.
机译：低塑性抛光（LPB）已被研究用作飞机结构老化的表面增强工艺和缓蚀方法。达到合金屈服强度并延伸到比典型腐蚀损坏更深的1.25毫米（0.050英寸）深度的压缩残余应力是可以实现的。可以实现出色的表面光洁度，而不会对表面和地下材料产生冶金学上的损坏。 100和500 h的盐雾暴露使2×10 6周期的疲劳强度降低了50％。腐蚀表面的LPB不会除去腐蚀产物或点蚀的材料，可使2×10 {sup} 6疲劳强度恢复到大于原始机加工表面的疲劳强度。 LPB后，在有限寿命范围（10 {sup} 4至10 {sup} 6个循环）中，腐蚀材料的疲劳强度比原始未腐蚀合金高140 MPa（20 ksi），从而使寿命延长了一个数量级。 。易于适应计算机数控（CNC）机床，使LPB的加工成本和速度堪比机械加工。低塑性打磨提供了一种有希望的新技术，可以减轻腐蚀损害并改善飞机结构部件的疲劳寿命，与目前的做法相比，可节省大量成本和时间。

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