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首页> 外文学位 >Strain-induced precipitation in ferrite during isothermal aging of niobium-microalloyed steel.
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Strain-induced precipitation in ferrite during isothermal aging of niobium-microalloyed steel.

机译：铌微合金钢在等温时效过程中应变诱导的铁素体析出。

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摘要

In niobium (Nb) microalloyed steels one of the strengthening mechanisms is precipitation of Nb(C, N). Precipitation in austenite has been studied and applied for many decades, but its precipitation in ferrite has been paid less attention. Some of the findings are somewhat contradictory.;Due to environmental and resource saving consideration in recent years, more and more scrap has been recycled and re-used. Thus, tramp elements inevitably exist in steel such as Cu, Sn, Ni and so on. These elements may influence properties of steels at some extent although they are very little in content.;The X80 steel examined in this thesis contains up to 0.09%wt. Nb, as well as 0.4% Cu, both of which can potentially precipitate in ferrite. However, most research has shown that Cu levels below 0.5% in steel do not precipitate out under normal processing conditions.;In the present work, this X80 steel was processed by a variety of thermomechanical treatments. The as hot deformed mechanical properties were tested and microstructures were characterized by field emission gun scanning electron microscopy (FEG-SEM). At low aging temperatures, simulating the coiling stage in steel hot rolling, many fine Cu precipitates were observed in ferrite compared to a few relatively large Nb containing precipitates. These results were rationalized, and the consequences were discussed.
机译：在铌（Nb）微合金钢中，强化机制之一是Nb（C，N）的析出。研究和应用奥氏体中的沉淀已有数十年的历史，但在铁素体中的沉淀却很少受到关注。其中一些发现有些矛盾。；由于近年来考虑到环境和资源节约的考虑，越来越多的废料已经被回收利用。因此，在钢中不可避免地存在诸如铝，铜，锡，镍等的杂质元素。尽管这些元素含量很少，但它们可能在一定程度上影响钢的性能。;本文研究的X80钢的含量最高为0.09％。 Nb和0.4％Cu都可能在铁素体中沉淀。但是，大多数研究表明，在正常的加工条件下，钢中的Cu含量低于0.5％不会析出。在目前的工作中，这种X80钢是通过各种热机械处理方法加工的。测试了热变形后的机械性能，并通过场发射枪扫描电子显微镜（FEG-SEM）对微观结构进行了表征。在低时效温度下，模拟钢热轧的卷取阶段，与少量相对较大的含Nb的析出物相比，在铁素体中观察到许多细小的Cu析出物。将这些结果合理化，并讨论后果。

著录项

  • 作者

    Wei, Qingfeng.;

  • 作者单位

    McGill University (Canada).;

  • 授予单位 McGill University (Canada).;
  • 学科 Engineering Materials Science.
  • 学位 M.Eng.
  • 年度 2005
  • 页码 105 p.
  • 总页数 105
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 工程材料学;
  • 关键词

  • 入库时间 2022-08-17 11:41:40

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