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首页> 外文期刊>Philosophical Magazine Letters >Ductile-to-brittle transition behavior of high-interstitial Fe-Cr-Mn alloys
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Ductile-to-brittle transition behavior of high-interstitial Fe-Cr-Mn alloys

机译：高间质Fe-Cr-Mn合金的韧性到脆性转变行为

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The ductile-to-brittle transition behavior of high-interstitial Fe-Cr-Mn alloys with different N and C contents is discussed in terms of the deformation microstructure and the mode of brittle fracture. The combined addition of N + C improved the low-temperature toughness by decreasing the ductile-to-brittle transition temperature, compared to the addition of N alone, by effectively increasing the free-electron concentration and enhancing the metallic component of interatomic bonding. Transmission electron microscopy observations on deformed regions beneath the fracture surface of Charpy impact specimens tested at low temperatures indicated that α'-martensite was formed at the intersections of deformation twins in the N + C alloy, unlike in the N alloy. Thus, it is suggested that the formation of α'-martensite exerts a beneficial influence on low-temperature toughness because it suppresses the initiation of brittle crack by reducing the internal stresses of intersecting twins. On the other hand, the ductile-to-brittle transition temperature of the N + C alloys increases with increasing C content, which could be explained by the occurrence of intergranular fracture resulting from the excessive content of C above a certain level.
机译：从变形组织和脆性断裂模式两个方面讨论了不同氮碳含量的高间隙Fe-Cr-Mn合金的韧脆转变行为。与单独添加N相比，联合添加N+C通过有效增加自由电子浓度和增强原子间键合的金属成分，降低了韧脆转变温度，从而提高了低温韧性。低温下夏比冲击试样断口下变形区域的透射电镜观察表明，与N合金不同，N+C合金中的α′-马氏体形成于变形孪晶的交叉处。因此，有人认为，α′-马氏体的形成对低温韧性产生了有益的影响，因为它通过降低相交孪晶的内应力来抑制脆性裂纹的萌生。另一方面，N+C合金的韧脆转变温度随着C含量的增加而升高，这可以解释为C含量超过一定水平导致晶间断裂的发生。

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