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On the microstructure control of the bendability of advanced high strength steels

机译：先进高强度钢弯曲性能的组织控制

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摘要

The formability of newly developed steel grades is a key parameter for their successful implementation in the car body. In the present work, the influence of the microstructure on formability during air bending is studied. First and third-generation advanced high strength steels with tensile strengths above 1000 MPa are investigated, which exhibit a broad range of microstructural constituents (ferritic bainite, bainite, martensite, and retained austenite). Interrupted bending experiments are performed on two grades of dual phase and complex phase steels, respectively, in order to reveal the microscopic deformation and failure processes. The formability in hole expansion tests is determined and used as a measure for the resistance of the materials against crack formation. The macroscopic deformation behavior of the materials is taken into account by measuring the differential strain hardening exponent and performing finite element simulations of the air bending process. Advantages and disadvantages of various microstructural features are worked out, and it is explained why the first-generation dual phase steel exhibits the lowest and the third-generation complex phase steel the best formability during air bending.
机译：新开发的钢种的可成形性是其在车身中成功实施的关键参数。在目前的工作中，研究了微结构对空气弯曲过程中可成形性的影响。研究了抗拉强度超过1000 MPa的第一代和第三代高强度高强度钢，这些钢具有广泛的显微组织成分（铁素体贝氏体，贝氏体，马氏体和残余奥氏体）。为了揭示微观形变和破坏过程，分别在两种等级的双相和复相钢上进行了间断弯曲实验。确定孔扩展测试中的可成形性，并将其用作衡量材料抗裂纹形成能力的方法。通过测量微分应变硬化指数并执行空气弯曲过程的有限元模拟，可以考虑材料的宏观变形行为。研究了各种微观结构特征的优缺点，并解释了为什么第一代双相钢在空气弯曲过程中表现出最低的价格，而第三代复相钢表现出最好的成形性。

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