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首页> 外文期刊>Materials Science and Engineering >Microstructural evolution and tensile properties of Fe-llMn-10Al-1.2C medium-Mn lightweight steel
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Microstructural evolution and tensile properties of Fe-llMn-10Al-1.2C medium-Mn lightweight steel

机译：Fe-LLMN-10AL-1.2C中型轻质钢的微结构演化与拉伸性能

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摘要

In the present study, the variations of microstructure and tensile properties were investigated as a function of aging time using a Fe-llMn-10Al-1.2C medium-Mn lightweight steel. The 1000 °C-annealed specimen revealed an austenite matrix containing nano-sized particles of intra-granular (IG) k-carbide and a small amount of a-ferrite. After aging at 550 °C for 3 min, pre-existing IG k-carbide grew up rapidly and relatively coarse k-carbide formed at the y-austenite grain boundary (GB). With aging for 10 min, the C-depleted zones, close to the coarsened GB k-carbide particles, were transformed to filmy grain boundary ferrite (GBF). When aging time increased to 30 min, the eutectoid reaction (γ→α + k) occurred preferentially at the coarse particles of GB k-carbide. The eutectoid reaction continued with increasing aging time up to 720 min, and finally the specimen had a eutectoid matrix (α+k) with a few of a-ferrite. The annealed specimen possessed high strengths (yield strength (YS) of 1242 MPa and ultimate tensile strength (UTS) of 1314 GPa) with moderate elongation (El) of 22.2%. The YS value of aged specimens was improved to ～1.35 GPa by the growth of IG k-carbide particles after aging for 3 min, and increased further up to ～1.54 GPa by the formation of eutectoid structure after aging for 720 min.
机译：在本研究中，使用Fe-LLMN-10AL-1.2C介质-MN轻质钢作为老化时间的函数研究了微观结构和拉伸性能的变化。 1000°C退火标本揭示了含有颗粒内颗粒状（Ig）k-碳化物的纳米尺寸颗粒的奥氏体基质和少量A-铁素体。在550℃下老化3分钟后，在Y奥族岩晶界（GB）上形成的预先存在的Ig k-碳化物迅速且相对粗的K-碳化物。随着衰老10分钟，将C-耗尽的区域靠近较粗的GB k-碳化物颗粒，转化为薄膜晶界铁氧体（GBF）。当老化时间增加至30分钟时，在GB k碳化物的粗颗粒处优先发生eutectoid反应（γ→α+ k）。共析反应继续增加老化时间，高达720分钟，最后，样品具有带有少量A-铁素体的共析基质（α+ k）。退火标本具有高强度（屈服强度（ys）的1242MPa和最终拉伸强度（UTS）的1314GPa），中等伸长率（EL）为22.2％。通过在老化3分钟后的Ig k-碳化物颗粒的生长改善了老化标本的Ys值通过Ig k-碳化物颗粒的生长，通过在老化后的720分钟后形成共析结构，进一步增加至约1.54gPa。

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  • 来源
    《Materials Science and Engineering》 |2020年第21期|140256.1-140256.9|共9页
  • 作者

    Degang Liu; Hua Ding; Dong Han; Minghui Cai; Young-Kook Lee;

  • 作者单位

    School of Materials Science & Engineering Northeastern University Shenyang 110819 China Department of Materials Science and Engineering Yonsei University 50 Yonsei-ro Seodaemun-gu 03722 Seoul Republic of Korea Key Laboratory of Lightweight Structural Materials Liaoning Province Shenyang 110819 China;

    School of Materials Science & Engineering Northeastern University Shenyang 110819 China Key Laboratory of Lightweight Structural Materials Liaoning Province Shenyang 110819 China;

    School of Materials Science & Engineering Northeastern University Shenyang 110819 China Key Laboratory of Lightweight Structural Materials Liaoning Province Shenyang 110819 China;

    School of Materials Science & Engineering Northeastern University Shenyang 110819 China Key Laboratory of Lightweight Structural Materials Liaoning Province Shenyang 110819 China;

    Department of Materials Science and Engineering Yonsei University 50 Yonsei-ro Seodaemun-gu 03722 Seoul Republic of Korea;

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  • 正文语种 eng
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  • 关键词

    Medium-Mn lightweight Steel; K-Carbide; Age-strengthening; Eutectoid reaction; Yield strength;

    机译：中型MN轻质钢;k碳化物;年龄加强;eutectoid反应;屈服强度;

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