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Fundamental Study on the Austenite Formation and Decomposition of low-Si, Al added Nb-Mo TRIP steels

机译：低Si，Al添加Nb-Mo TRIP钢的奥氏体形成和分解的基础研究

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摘要

TRIP (Transformation Induced Plasticity) steels are under development for automotive applications that require high strength and high formability. Conventional TRIP steels consist of a multiphase microstructure consisting of a ferrite matrix with a dispersion of bainite and metastable retained austenite. The high ductility exhibited by these steels results from the transformation of the metastable retained austenite to martensite during straining. In conventional TRIP steel processing, the multiphase microstructure is obtained by controlled cooling from the austenite+ferrite region to an isothermal holding (bainitic)temperature. During this holding, bainite forms and carbon is rejected out into the austenite, which stabilizes the austenite to room temperature.In this research project, a fundamental study in a low-Si, Mo-Nb added cold rolled TRIP with and without Al additions was conducted, where the austenite formation in the two-phase region and the characteristics of the decomposition of intercritically annealed austenite were analyzed. The systematic study of the recrystallization of ferrite during intercritical annealing was also of primary importance. Similarly, this study intended to obtain a fundamental knowledge of the decomposition behavior of intercritically annealed austenite by controlled cooling rates. Of special interest was to study the effect of the initial hot band microstructure and intercritically annealed austenite on the formation of bainite during the isothermal holding temperature as well as the formation of epitaxial ferrite during cooling from the intercritical annealing temperature to the isothermal holding temperature. Furthermore, the influence of the starting hot band microstructure and processing parameters during TRIP steel processing on the type, amount, and composition of retained austenite and its stability were evaluated. During this research study, techniques such as OM, SEM, EBSD, TEM, XRD and Magnetometry analysis were used to fully characterize the corresponding microstructures.
机译：TRIP（相变诱导塑性）钢正在开发用于要求高强度和高成形性的汽车应用。常规的TRIP钢由多相组织组成，该组织由具有贝氏体和亚稳态残留奥氏体的分散体的铁素体基体组成。这些钢表现出的高延展性归因于在应变过程中亚稳态残留奥氏体向马氏体的转变。在常规的TRIP钢加工中，通过从奥氏体+铁素体区域到等温保持（贝氏体）温度的受控冷却来获得多相组织。在此保温过程中，贝氏体形式和碳被排除在奥氏体中，从而使奥氏体稳定在室温。在这项研究项目中，一项对低硅，Mo-Nb的基本研究是添加冷轧的TRIP，添加和不添加Al进行了分析，分析了两相区的奥氏体形成和临界退火奥氏体的分解特性。进行临界退火过程中铁素体再结晶的系统研究也很重要。同样，本研究旨在通过控制冷却速率获得有关临界退火奥氏体分解行为的基础知识。特别感兴趣的是研究在等温保持温度期间初始热带组织和临界退火的奥氏体对贝氏体形成的影响，以及从临界间退火温度冷却至等温保持温度期间外延铁素体的形成。此外，评估了TRIP钢加工过程中起始热带组织和工艺参数对残余奥氏体的类型，数量和组成及其稳定性的影响。在本研究过程中，使用了OM，SEM，EBSD，TEM，XRD和磁力分析等技术来充分表征相应的微结构。

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