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首页> 外文期刊>Materials Science and Engineering >High toughness in the intercritically reheated coarse-grained (ICRCG) heat-affected zone (HAZ) of low carbon microalloyed steel
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High toughness in the intercritically reheated coarse-grained (ICRCG) heat-affected zone (HAZ) of low carbon microalloyed steel

机译：低碳微合金钢的临界再加热粗晶粒（ICRCG）热影响区（HAZ）具有高韧性

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摘要

Motivated by the small lattice mismatch between ferrite and vanadium nitride (VN), we describe here the welding thermal cycle simulation that provides high toughness in the ICRCG HAZ of low carbon V-N steel. This unique behavior is attributed to the formation of ultra-fine grained ferrite along prior austenite grain boundaries generated by the first pass welding thermal cycle with high misorientation boundaries, where V(C, N) precipitates provide potential nucleation sites for ferrite, leading to extraordinary refinement of martensite/austenite (M/A) constituent. Nitrogen stimulates the precipitation behavior of V(C, N). The nucleation of high density of V(C, N) precipitates consumes carbon-content in the austenite, leading to decrease in the carbon-content in the M/A constituent, with consequent decrease in hardness. The increase in toughness is explained in terms of Griffith's crack propagation theory.
机译：受铁素体和氮化钒（VN）之间小的晶格失配的影响，我们在此描述焊接热循环模拟，该模拟为低碳V-N钢的ICRCG HAZ提供了高韧性。这种独特的行为归因于沿具有高取向差边界的首道焊接热循环沿先前的奥氏体晶粒边界形成超细晶粒铁素体，其中V（C，N）沉淀物为铁素体提供了潜在的成核位点，从而导致异常马氏体/奥氏体（M / A）成分的细化。氮刺激V（C，N）的沉淀行为。 V（C，N）析出物的高密度成核会消耗奥氏体中的碳含量，从而导致M / A成分中的碳含量降低，从而导致硬度降低。用格里菲斯的裂纹扩展理论解释了韧性的增加。

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  • 来源
    《Materials Science and Engineering》 |2014年第10期|323-328|共6页
  • 作者

    Jun Hu; Lin-Xiu Du; Jian-Jun Wang; Hui Xie; Cai-Ru Gao; R.D.K. Misra;

  • 作者单位

    The State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang 110819, China;

    The State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang 110819, China;

    Institute of Materials Research, School of Material and Metallurgy, Northeastern University, Shenyang 110819, China;

    The State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang 110819, China;

    The State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang 110819, China;

    Laboratory for Excellence in Advanced Steel Research, Center for Structural and Functional Materials, University of Louisiana at Lafayette, Lafayette, LA 70504-4130, USA;

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  • 正文语种 eng
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  • 关键词

    ICRCG HAZ; Peak temperature; Toughness; Ultra-fine grain; V-N microalloyed steel;

    机译：红十字国际委员会危险品;峰值温度韧性;超细晶粒;V-N微合金钢;

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