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

从广义上讲，这项工作将集中在微观结构对具有1200 MPa和更高的极限抗拉强度的钢的机械性能和可成形性的影响。在微观结构上，这项工作有两个主要组成部分，首先，PI将评估微观结构对复杂微观结构的机械行为和可成形性的影响，这些复杂微观结构由0%，25%或50%的铁素体与100%，75%或50%的马氏体或贝氏体组成。在每个铁素体水平下，马氏体和贝氏体将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量和机械稳定性。因此，PI将解决铁素体量、残余奥氏体特性和贝氏体结构（与马氏体结构相对）对加工硬化行为、延展性、韧性和可成形性的影响。在第二部分中，他们将研究夹杂物对空隙成核的阻力对成形性的影响。在更广泛的影响中，实现上述将提供关于如何在高强度钢板中实现高成形性的有用信息，这将有益于实际参与这种材料的生产和使用的那些人。

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.