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首页> 外文期刊>ISIJ international >Effect of Silicon on AHSS As-Cast Microstructure Development and Properties
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Effect of Silicon on AHSS As-Cast Microstructure Development and Properties

机译：硅对AHSS铸态显微组织发展和性能的影响

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摘要

This work linked properties and performance in as-cast condition for 3rd generation advanced high strength steel (AHSS) by examining the effects of chemical composition and microstructure on mechanical properties. Elevated levels of carbon, manganese, and silicon in new AHSS grades lead to a complex evolution of microstructure during solidification that can lead to castability problems. Three lab cast ingots with 0.2 wt% C, 3 wt% Mn, and 0.5, 1.5, and 3 wt% Si were characterized by their microstructure and mechanical properties. Light optical microscopy (LOM) and Scanning Electron Microscopy (SEM) confirmed that the microstructure of steels was mostly granular bainite, with some proeutectoid ferrite allotriomorphs at 3 wt% Si. Tensile testing showed Si increased strength and that ductility of all samples was low. Higher silicon levels were found to promote formation of proeutectoid ferrite allotriomorphs and changed the cracking propagation behavior. Some comparisons between the observed microstructures and those expected in continuously cast slabs were also discussed.
机译：通过检查化学成分和微观结构对机械性能的影响，这项工作将第三代高级高强度钢（AHSS）的铸态条件下的性能与性能联系起来。在新的AHSS等级中，碳，锰和硅的含量升高会导致凝固过程中微观结构的复杂演变，从而可能导致浇铸性问题。三种具有0.2 wt％C，3 wt％Mn和0.5、1.5和3 wt％Si的实验室铸锭的微观结构和机械性能得以表征。光学显微镜（LOM）和扫描电子显微镜（SEM）证实，钢的显微组织主要是粒状贝氏体，在Si含量为3 wt％时有一些前共析铁素体同素异形体。拉伸试验表明Si强度增加，所有样品的延展性均较低。发现较高的硅含量促进原共析铁素体同素异形体的形成并改变了裂纹扩展行为。还讨论了观察到的组织与连续铸坯中预期的组织之间的一些比较。

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  • 来源
    《ISIJ international》 |2019年第5期|858-864|共7页
  • 作者

    Rafael Coura GIACOMIN; Bryan A. WEBLER;

  • 作者单位

    Carnegie Mellon University, 5000 Forbes Ave., Pittsburgh - PA, 15213 USA.;

    Carnegie Mellon University, 5000 Forbes Ave., Pittsburgh - PA, 15213 USA.;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    AHSS; microstructure; cracking; ferrite allotriomorphs; DICTRA;

    机译：AHSS;微观结构破裂铁素体同质异形体迪卡特;

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