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首页> 外文学位 >The Influence of Manganese Content and Temperature on the Relative FCC/HCP Phase Stability and Strain-Hardening Behavior of High-Manganese TRIP/TWIP Steels.
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The Influence of Manganese Content and Temperature on the Relative FCC/HCP Phase Stability and Strain-Hardening Behavior of High-Manganese TRIP/TWIP Steels.

机译：锰含量和温度对高锰TRIP / TWIP钢的相对FCC / HCP相稳定性和应变强化行为的影响。

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摘要

High-manganese austenitic transformation- and twinning-induced plasticity (TRIP/TWIP) steels are a new class of advanced high strength steels (AHSSs) that have received significant research interest over the last decade owing to their superior combination of strain-hardening, strength and ductility compared to other types of steel [1] [2] [3] [4] [5] [6] [7] [8] (see Figure 1-1). The automotive industry is highly interested in these steels as a means to reduce vehicle weight (through down gauging), increase crash worthiness and improve manufacturing efficiency through better room temperature formability. The performance requirements of structural automotive components are largely being driven by more stringent fuel economy and safety requirements. New corporate average fuel economy (CAFE) standards will require the average fuel economy of a manufacturer's fleet of cars and light trucks to be 54.5 miles per gallon (MPG) by 2025 [9]. Increasingly rigorous crash requirements, like the Insurance Institute for Highway Safety (IIHS) offset frontal impact test [10], require materials that can dissipate large amounts of energy during crashes in order to protect vehicle occupants. While lighter-weight materials such as Aluminum and Magnesium will play a role in meeting these requirements, AHSSs currently offer substantial cost savings over the aforementioned materials and are the preferred material to meet these targets [11]. Figure 1-2 shows the estimated production costs/savings associated with reducing vehicle mass with several types of material solutions. AHSSs are currently the only material which can reduce vehicle mass and production costs simultaneously. In fact, several automotive manufacturers, such as Volkswagen [12], have begun replacing aluminum with thinner gauge AHSS to retain weight savings while lowering costs. The multinational steel manufacturer POSCO has recently produced the first commercially available high-Mn TWIP steel [13] proving that these materials have the potential to play an important part in automotive design in the coming years. However, there are still many aspects of these steels and their unique deformation mechanisms that are not well understood. Further research is necessary to ensure TRIP and TWIP steels become a major part of the solution to the challenges of the automotive community.
机译：高锰奥氏体相变和孪生诱导可塑性（TRIP / TWIP）钢是一类新型的高级高强度钢（AHSS），由于其应变硬化，强度的卓越组合，在过去十年中受到了广泛的研究兴趣与其他类型的钢[1] [2] [3] [4] [5] [6] [7] [8]相比，延展性和延展性（见图1-1）。汽车行业对这些钢非常感兴趣，这些钢可以减轻车辆的重量（通过向下计量），提高防撞性能并通过改善室温成形性来提高制造效率。更加严格的燃油经济性和安全性要求在很大程度上推动了汽车结构件的性能要求。新的公司平均燃油经济性（CAFE）标准将要求到2025年，制造商的汽车和轻型卡车车队的平均燃油经济性为54.5英里每加仑（MPG）[9]。越来越严格的碰撞要求，例如高速公路安全保险协会（IIHS）抵消正面碰撞试验[10]，要求使用能够在碰撞过程中耗散大量能量的材料，以保护车辆乘员。虽然轻质材料（例如铝和镁）将在满足这些要求方面发挥作用，但相比于上述材料，AHSS目前可节省大量成本，并且是实现这些目标的首选材料[11]。图1-2显示了使用几种类型的材料解决方案减少车辆重量所带来的估计生产成本/节省。 AHSS目前是唯一可以同时减少车辆质量和生产成本的材料。实际上，一些汽车制造商，例如大众[12]，已经开始用更薄规格的AHSS代替铝，以保持重量的减轻，同时降低成本。跨国钢铁制造商POSCO最近生产了第一批市售的高锰TWIP钢[13]，证明了这些材料在未来几年中有可能在汽车设计中发挥重要作用。但是，这些钢的许多方面及其独特的变形机理仍未得到很好的理解。为了使TRIP和TWIP钢成为解决汽车行业挑战的主要方法，有必要进行进一步的研究。

著录项

  • 作者

    Pierce, Dean Thomas.;

  • 作者单位

    Vanderbilt University.;

  • 授予单位 Vanderbilt University.;
  • 学科 Materials science.
  • 学位 Ph.D.
  • 年度 2014
  • 页码 181 p.
  • 总页数 181
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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