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Quantitative research on effects of Nb on hot deformation behaviors of high-Nb microalloyed steels

机译：铌对高铌微合金钢热变形行为影响的定量研究

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摘要

The hot deformation behaviors of six high-Nb steels were investigated by hot compression methods on a Gleeble-3500 thermo-mechanical simulator. The amount of Nb in solution and/or in precipitates of the specimens deformed at different conditions was determined by inductively coupled plasma-atomic emission spectrometry (ICP-AES). The effects of dissolved Nb and precipitates on hot deformation behavior were discussed. The results show that Nb cannot be completely dissolved in the high-Nb steels during the reheating process, and the undissolved precipitates do not influence the dynamic recrystallization due to their larger size. Moreover, the undissolved precipitates more effectively influence the peak stress instead of peak strain. Strain induced precipitation occurs during the hot deformation process. However, the precipitates cannot delay the dynamic recrystallization because of the longer induction period. The deformation activation energy presents a perfect linear correlation as a function of the amount of Nb in solutions, and each addition of Nb by 1 wt% would lead to an increase of the deformation activation energy by 1599.9±137.7kJ/mol.
机译：通过热压缩方法在Gleeble-3500热机械模拟器上研究了六种高Nb钢的热变形行为。通过电感耦合等离子体原子发射光谱法（ICP-AES）确定在不同条件下变形的样品的溶液和/或沉淀物中的Nb量。讨论了固溶Nb和析出物对热变形行为的影响。结果表明，在再加热过程中Nb不能完全溶解在高Nb钢中，并且未溶解的析出物由于尺寸较大而不会影响动态再结晶。而且，未溶解的沉淀物更有效地影响峰值应力而不是峰值应变。在热变形过程中会发生应变诱发的沉淀。然而，由于更长的诱导期，沉淀物不能延迟动态再结晶。变形激活能呈现出与溶液中Nb量成函数关系的理想线性关系，每添加1 wt％Nb将导致变形激活能增加1599.9±137.7kJ / mol。

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  • 来源
    《Materials Science and Engineering》 |2011年第2011期|p.277-284|共8页
  • 作者

    Ya-bin Cao; Fu-ren Xiao; Gui-ying Qiao; Xiao-bing Zhang; Bo Liao;

  • 作者单位

    Key Laboratory of Metastable Materials Science & Technology, College of Materials Science and Engineering, Yanshan University, Qinhuangdao 066004, China;

    Key Laboratory of Metastable Materials Science & Technology, College of Materials Science and Engineering, Yanshan University, Qinhuangdao 066004, China;

    Key Laboratory of Metastable Materials Science & Technology, College of Materials Science and Engineering, Yanshan University, Qinhuangdao 066004, China;

    Key Laboratory of Metastable Materials Science & Technology, College of Materials Science and Engineering, Yanshan University, Qinhuangdao 066004, China;

    Key Laboratory of Metastable Materials Science & Technology, College of Materials Science and Engineering, Yanshan University, Qinhuangdao 066004, China;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    dynamic recrystallization; strain induced precipitation; dissolved nb; deformation activation energy;

    机译：动态再结晶;应变诱发析出;固溶铌;变形活化能;

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