AHSS:Development of Nano-acicular Duplex Steels

AHSS：纳米针状双相钢的开发

• 批准号: 0726888
• 负责人: David Van Aken
• 金额: $ 8.66万
• 依托单位: Missouri University of Science and Technology
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2008
• 资助国家: 美国
• 起止时间: 2008-01-01 至 2012-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0726888&HistoricalAwards=false
• 关键词: AHSS; Development; Nano; acicular; Duplex

Advanced high strength steels (AHSS) with duplex microstructures of ferrite and austenite will be developed analogous to high strength and fracture resistant titanium alloys that have acicular microstructures. The project team will address issues of current scientific importance with regard to bainitic phase transformations, phase transformation toughening and direct calculations of the physical properties of iron solid solutions. Systematic calculations of the electronic structure and crystal lattice distortions will be performed using the highly precise first-principles full potential linearized augmented plane wave (FLAPW) method. Theoretical calculations will examine atomic clustering and the effect of alloying elements on the drift of light impurities (C, N, and B). Full understanding of the atomic level properties will allow us to design steels with acicular microstructures on a smaller scale with greater strength and toughness. The advanced high strength steels under investigation will facilitate the design of lighter weight vehicles that are more fuel efficient, but maintain passenger safety with improved crash worthiness. These new steels will keep steel competitive both in performance and cost with respect to aluminum and other lightweight materials. This program will help recruit and train individuals to work in the steel industry. The steel industry has always been an avenue of social change. Historically many ?new? Americans gained entrance into the middle class through this industry. We expect to continue this tradition and under-represented groups will be benefactors of this research either directly as student research assistants or indirectly through employment in the steel industry.

将开发具有铁素体和奥氏体双相微观结构的先进高强度钢（AHSS），类似于具有针状微观结构的高强度和抗断裂钛合金。该项目团队将解决当前在贝氏体相变、相变增韧和铁固溶体物理性质的直接计算方面具有重要科学意义的问题。 将使用高精度第一原理全势线性化增强平面波（FLAPW）方法对电子结构和晶格畸变进行系统计算。理论计算将检查原子簇以及合金元素对轻杂质（C、N 和 B）漂移的影响。 对原子级特性的充分了解将使我们能够设计出具有更大强度和韧性的更小尺寸的针状微观结构钢。正在研究的先进高强度钢将有助于设计更轻的车辆，这些车辆的燃油效率更高，但可以通过提高耐撞性来维持乘客的安全。 这些新型钢材将使钢材在性能和成本方面相对于铝和其他轻质材料保持竞争力。该计划将帮助招聘和培训在钢铁行业工作的人员。 钢铁行业一直是社会变革的一个途径。 历史上有很多？新的？美国人通过这个行业进入了中产阶级。 我们希望延续这一传统，代表性不足的群体将直接作为学生研究助理或通过在钢铁行业就业间接成为这项研究的捐助者。