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首页> 外文期刊>Materials Science and Engineering >Influence of the Al and Mn content on the structure-property relationship in density reduced TRIP-assisted sheet steels
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Influence of the Al and Mn content on the structure-property relationship in density reduced TRIP-assisted sheet steels

机译：Al和Mn含量对密度降低的TRIP辅助钢板中组织性能关系的影响

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摘要

In the present study four different density reduced TRIP steel concepts with varying Mn and Al contents were investigated with regard to their microstructure, mechanical properties and retained austenite (RA) stability. For the hot rolled strips, scanning electron microscopy (SEM) revealed a microstructure consisting of ferrite and two types of carbides. Using both X-ray diffraction (XRD) and SEM with backscattered electron (BSE)-detection, the carbides were identified as cementite for the steel grades containing 2.8 and 3.3 wt% Al and kappa-carbides for the compositions with 5.2 wt% Al. The microstructure of the laboratory continuously annealed cold rolled sheets consisted of numerous inclusions of bainite and RA, embedded in a ferritic matrix. As an aftermath of the increased Al content, resulting in an increased ferrite content, the bainitic transformation was significantly reduced, which led to a destabilization of RA and in turn to the formation of martensite upon final cooling to room temperature (RT). With increasing Al- and Mn-contents the tensile strength rose from 720 to 1050 MPa, whereas the total elongation decreased from 39% to 17%. Both highest mechanical and chemical RA stability were found for the steel grades containing 2.8 and 3.3 wt% Al, resulting in the superior combination of strength and ductility, namely R(m)XA(80) of almost 30,000 MPa% by a density reduction up to almost 5%.
机译：在本研究中，研究了四种不同密度降低的TRIP钢概念，这些概念具有不同的Mn和Al含量，涉及其微观结构，力学性能和残余奥氏体（RA）稳定性。对于热轧带钢，扫描电子显微镜（SEM）显示了由铁素体和两种碳化物组成的显微组织。使用X射线衍射（XRD）和SEM结合背向散射电子（BSE）检测，对于含2.8和3.3 wt％Al的钢种，碳化物被确定为渗碳体，对于含5.2 wt％Al的组合物，碳化物被确定为κ碳化物。实验室连续退火冷轧薄板的微观结构由许多贝氏体和RA夹杂物组成，并嵌入铁素体基体中。由于增加了铝含量，导致铁素体含量增加，贝氏体转变显着减少，这导致RA不稳定，最终冷却至室温（RT）时又形成马氏体。随着Al和Mn含量的增加，抗拉强度从720 MPa增加到1050 MPa，而总伸长率从39％降低到17％。含有2.8和3.3 wt％的Al的钢种均具有最高的机械和化学RA稳定性，从而通过强度降低达到强度和延展性的优异组合，即R（m）XA（80）几乎达到30,000 MPa％。几乎达到5％。

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