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首页> 外文期刊>Journal oflaser Applications >Corrosion performance and restoration of laser-formed metallic alloy sheets
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Corrosion performance and restoration of laser-formed metallic alloy sheets

机译：激光成形金属合金薄板的腐蚀性能和修复

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摘要

Previous studies of laser forming have been focused on understanding the laser forming mechanisms, investigating the effects of important laser process parameters on deformed shape, and modeling the forming process. Although microstructures and mechanical properties have received some attention, no work has addressed corrosion behavior of laser-formed components. However, laser forming is a thermal process with substantial thermal cycles required; sensitization of microstructures to corrosion may be anticipated. This paper investigates the corrosion performance of various laser-formed metallic alloy sheets, including AA 2024-T3, AA 7075-T6, and AA 5083-O aluminum alloys, and AISI 304 austenitic and AISI 430 ferritic stainless steels using various standard corrosion testing methods. The results showed that the laser forming process induced different degrees of sensitization within the irradiated zones and the heat-affected zones (HAZs), leading to significant intergranular corrosion attacks for most of the alloys. Materials characterization of the microstructural evolution, in terms of elemental segregation, precipitate distribution, and phase transformation within the laser irradiated zones and HAZs using field emission gun-scanning electron microscopy and TEM, provided evidence of an increased susceptibility to localized corrosion. However, an improved resistance to intergranular corrosion after laser forming was observed for AA 5083-O alloy. In order to restore the corrosion properties of laser-formed AA 7075-T6 components, postforming heat treatments (PFHTs), involving solution treatment at 480℃ for times of 0.5, 2, and 4 h followed by artificial aging at 120℃ for 20 h, were carried out. The results indicated that both corrosion resistance and microhardness were fully recovered to those of the original T6 condition via appropriate PFHT.
机译：以前的激光成型研究集中在理解激光成型机理，研究重要的激光工艺参数对变形形状的影响以及对成型工艺进行建模方面。尽管微结构和机械性能引起了人们的关注，但是还没有任何工作解决激光成形部件的腐蚀行为。但是，激光成型是需要大量热循环的热过程。可以预期微结构对腐蚀的敏感性。本文使用各种标准腐蚀测试方法研究了各种激光成形金属合金薄板的腐蚀性能，包括AA 2024-T3，AA 7075-T6和AA 5083-O铝合金以及AISI 304奥氏体和AISI 430铁素体不锈钢。结果表明，激光成形过程在辐照区和热影响区（HAZs）内引起了不同程度的敏化，从而导致大多数合金发生明显的晶间腐蚀。使用场发射枪扫描电子显微镜和TEM进行的微观结构演化的材料表征，包括元素隔离，沉淀物分布和激光辐照区和HAZ内的相变，提供了对局部腐蚀敏感性提高的证据。但是，对于AA 5083-O合金，观察到激光成型后的抗晶间腐蚀性能得到改善。为了恢复激光成形的AA 7075-T6部件的腐蚀性能，需要进行后成形热处理（PFHT），包括在480℃固溶处理0.5、2和4 h，然后在120℃进行人工时效20 h。 ，进行了。结果表明，通过适当的PFHT，耐蚀性和显微硬度均可完全恢复到原始T6条件。

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  • 来源
    《Journal oflaser Applications》 |2009年第2期|76-81|共6页
  • 作者

    Z. Liu; C. Guzman; H. Liu; A. Anacleto; T. Francisco; M. Abdoalshafie; L. Ma; O. Abodunrin; P. Skeldon;

  • 作者单位

    Corrosion and Protection Centre, School of Materials, The University of Manchester, Manchester M60 1 QD, United Kingdom;

    Corrosion and Protection Centre, School of Materials, The University of Manchester, Manchester M60 1 QD, United Kingdom;

    School of Mechanical Engineering, Shandong Institute of Light Industry, Jinan 250353, People's Republic of China;

    Corrosion and Protection Centre, School of Materials, The University of Manchester, Manchester M60 1 QD, United Kingdom;

    Corrosion and Protection Centre, School of Materials, The University of Manchester, Manchester M60 1 QD, United Kingdom;

    Corrosion and Protection Centre, School of Materials, The University of Manchester, Manchester M60 1 QD, United Kingdom;

    Corrosion and Protection Centre, School of Materials, The University of Manchester, Manchester M60 1 QD, United Kingdom;

    Corrosion and Protection Centre, School of Materials, The University of Manchester, Manchester M60 1 QD, United Kingdom;

    Corrosion and Protection Centre, School of Materials, The University of Manchester, Manchester M60 1 QD, United Kingdom;

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  • 正文语种 eng
  • 中图分类
  • 关键词

    laser forming; laser bending; aluminum alloy; stainless steel; corrosion;

    机译：激光成型激光弯曲铝合金;不锈钢;腐蚀;

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