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首页> 外文期刊>Materials Science and Engineering >Precipitation behavior during thin slab thermomechanical processing and isothermal aging of copper-bearing niobium-microalloyed high strength structural steels: The effect on mechanical properties
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Precipitation behavior during thin slab thermomechanical processing and isothermal aging of copper-bearing niobium-microalloyed high strength structural steels: The effect on mechanical properties

机译：含铜铌微合金高强度结构钢的薄板坯热机械加工和等温时效过程中的析出行为：对力学性能的影响

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摘要

We describe here the precipitation behavior of copper and fine-scale carbides during thermo-mechanical processing and isothermal aging of copper-bearing niobium-microalloyed high strength steels. During thermo-mechanical processing, precipitation of ε-copper occurs in polygonal ferrite and at the austenite-ferrite interface. In contrast, during isothermal aging, nucleation of ε-copper precipitation occurs at dislocations. In the three different chemistries investigated, the increase in strength associated with copper during aging results only in a small decrease in impact toughness, implying that copper precipitates do not seriously impair toughness, and can be considered as a viable strengthening element in microalloyed steels. Precipitation of fine-scale niobium carbides occurs extensively at dislocations and within ferrite matrix together with vanadium carbides. In the presence of titanium, titanium carbides act as a nucleus for niobium carbide formation. Irrespective of the nature of carbides, copper precipitates and carbides are mutually exclusive.
机译：我们在此描述含铜铌微合金高强度钢在热机械加工和等温时效过程中铜和小尺寸碳化物的析出行为。在热机械加工过程中，ε-铜的析出发生在多边形铁素体和奥氏体-铁素体界面处。相反，在等温时效过程中，ε-铜沉淀的成核在位错处发生。在所研究的三种化学方法中，时效过程中与铜有关的强度增加只会导致冲击韧性略有下降，这意味着铜沉淀物不会严重损害韧性，并且可以认为是微合金钢中可行的强化元素。在位错处和铁素体基质中，碳化钒与碳化铌一起大量析出。在钛的存在下，碳化钛充当碳化铌形成的核。无论碳化物的性质如何，铜析出物和碳化物都是互斥的。

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  • 来源
    《Materials Science and Engineering》 |2011年第30期|p.8772-8780|共9页
  • 作者

    R.D.K. Misra; Z. Jia; R. OMalley; S.J. Jansto;

  • 作者单位

    Center for Structural and Functional Materials, University of Louisiana at Lafayette, P.O. Box 44130, Lafayette, LA 70503, USA;

    Center for Structural and Functional Materials, University of Louisiana at Lafayette, P.O. Box 44130, Lafayette, LA 70503, USA;

    Nucor Steel Decatur, LLC Sheet Mill 4301, Iverson Blvd., Trinity, AL 35673, USA;

    CBMM-Reference Metals Company. 1000 Old Pond Road, Bridgeville, PA 15017, USA;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    microalloyed steels; copper; mechanical properties;

    机译：微合金钢;铜;机械性能;

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