AHSS: A Study of the Effects of Microstructure on the Mechanical Properties and Failure Mechanisms of Advanced High Strength Steels

总的来说，这项工作将侧重于微观组织对极限抗拉强度为1200兆帕及以上的钢的力学性能和成形性的影响。在显微组织方面，主要有两个方面的工作：第一，pi将评估微观组织对0%、25%或50%铁素体与100%、75%或50%马氏体或贝氏体相结合的复杂显微组织的力学行为和成形性的影响。在每个铁素体水平上，马氏体和贝氏体具有相似的强度水平。在所有这些结构中，pi可以改变残余奥氏体的数量和机械稳定性。因此，pi将解决铁素体的数量、保留的奥氏体特征和贝氏体组织（而不是马氏体组织）对加工硬化行为、延展性、韧性和成形性的影响。其次，他们将研究夹杂物对空穴成核的抗性对成形性的影响。在更广泛的影响中，完成上述工作将为如何实现高强度钢板的高成形性提供有用的信息，这将有利于那些实际参与生产和使用这种材料的人。

Broadly speaking this work will focus on the effects of microstructure on the mechanical properties and formability of steels having ultimate tensile strengths of 1200 MPa and higher. Microstructurally, there are two main components to the work, In the first, PIs will evaluate the effects of microstructure on the mechanical behavior and formability of complex microstructures consisting of 0%, 25% or 50 % ferrite combined with 100%, 75% or 50% of either Martensite or Bainite. At each ferrite level the Martensite and Bainite will have similar strength levels. In all of these structures PIs can vary the amount and mechanical stability of the retained austenite. Thus PIs will address the effects of the amount of ferrite, of retained austenite characteristics and of a Bainitic structure as opposed to a Martensitic structure on work hardening behavior, ductility, toughness and formability. In the second, they will examine the effects of the resistance of inclusions to void nucleation on formability. In the broader impact, accomplishing the above will provide useful information on how to achieve high formability in high strength sheet steels which would be of benefit to those actually involved in the production and use of such materials.