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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：在变形微观结构和脆性骨折模式方面讨论了具有不同N和C含量的高间质Fe-Cr-Mn合金的韧性到脆性转变行为。通过有效地增加自由电子浓度并增强间隙键合的金属成分，通过降低N + C的组合加入N + C通过降低延伸脆性转变温度来提高低温韧性。在低温下测试的夏巴冲击样品的断裂面下的变形区域的透射电子显微镜观察表明，在N + C合金中的变形双胞胎的交叉处形成α'-马氏体，与N合金不同。因此，建议α'-马氏体的形成对低温韧性产生有益的影响，因为它通过减少交叉双胞胎的内部应力来抑制脆性裂纹的启动。另一方面，N + C合金的脆性转变温度随着C含量的增加而增加，该含量增加，这可以通过由一定水平高于C的过量含量而产生的晶间断裂产生。

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