Controlling Carbide Evolution to Improve the Ductility in High Specific Young’s Modulus Steels
Controlling Carbide Evolution to Improve the Ductility in High Specific Young’s Modulus Steels
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DOI：
10.1007/s40195-022-01390-x
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发表时间：
2022-02
期刊：
影响因子：
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通讯作者：
Peng Chen;Xin Xu;Chao-Te Lin;Fuming Yang;Jiachen Pang;Xiaowu Li;H. Yi
中科院分区：
文献类型：
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作者：
Peng Chen;Xin Xu;Chao-Te Lin;Fuming Yang;Jiachen Pang;Xiaowu Li;H. Yi
通过引入大量的κ-碳化物（κ-carbide）可以获得高比弹性模量的钢，并通过有效的离异共析转变（DET）处理来提高其塑性。对于这种钢，碳和铝含量不仅影响碳化物分数，而且影响碳化物的类型和形态，从而影响机械性能。在这项工作中，合金的设计，通过考虑碳化物形态和杨氏模量，并在高比杨氏模量钢中的碳化物通过控制在一个合适的范围内的碳含量进行调整，以实现良好的强度和塑性的组合。详细研究了DET反应过程中的组织演变过程，发现较高的晶化温度和低于300 ℃ h-1的冷却速率是合适的。通过在有限的碳含量范围内设计碳含量，可以避免块状碳化物的产生。讨论了实验钢的组织与性能的关系，为今后开发高比弹性模量钢提供了动力。
A high specific Young’s modulus steel could be achieved by introducing a large fraction of kappa-carbides (κ-carbide), and its ductility was improved by efficiency divorced eutectoid transformation (DET) treatment. For this steel, carbon and aluminum contents affect not only the carbide fraction, but also the type and morphology of carbides, and consequently the mechanical properties. In this work, the alloy was designed by considering both the carbide morphology and Young’s modulus, and the carbides in the high specific Young’s modulus steels were adjusted by controlling carbon content in a suitable range for achieving a good combination of strength and ductility. The detailed microstructure evolution process during DET reaction was studied, and it was found that a higher austenitizing temperature and the cooling rate lower than 300 ℃ h−1are suitable. The blocky carbides could be avoided by designing the carbon content in a limited content range. The microstructure-property relationship of the experimental steels was also discussed for giving an impetus to the future development of high specific Young’s modulus steels.