Effect of austenite grain size on transformation of nanobainite and its mechanical properties
Effect of austenite grain size on transformation of nanobainite and its mechanical properties
复制标题
奥氏体晶粒尺寸对纳米贝氏体相变及其力学性能的影响
DOI：
10.1016/j.msea.2016.04.041
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发表时间：
2016-06
期刊：
影响因子：
6.4
通讯作者：
Liu, Yongning
中科院分区：
文献类型：
--
作者：
Liu, Hongji;Sun, Junjie;Guo, Shengwu;Liu, Yongning
纳米贝氏体钢表现出出色的强度和延展性。然而，纳米贝氏体的相变率和冲击韧性仍有待提高。以0.8C-1.5Si-2.0Mn-1.0Cr-0.24Mo-1.0Al-1.6Co钢为研究对象，研究了奥氏体晶粒度细化到超细晶粒对贝氏体相变和力学性能的影响。结果表明，奥氏体晶粒从53µm细化到3µm可显著促进贝氏体相变，但近一半的贝氏体不再是典型的纳米贝氏体，同时仍残留大量不利于钢韧性的块状奥氏体。当晶粒度为18微米时，冲击韧性最好，为51J/cm2，相应的强度为2034J/cm2，塑性为14%。
Nanobainite steels display an excellent combination of outstanding strength and ductility. However, the transformation rate and impact toughness of nanobainite still need to be improved. In this work, the effect of refining austenite grain size to an ultrafine one on bainite transformation and its mechanical properties were investigated using a steel with composition of 0.8C-1.5Si-2.0Mn-1.0Cr-0.24Mo-1.0Al-1.6Co. The results show that refining austenite grain from 53 µm to 3 µm can accelerate the bainite transformation significantly, but almost half amount of the bainite is no longer typical nanostructured bainite, and plenty of undesirable blocky austenite which is harmful to the toughness of the steel remains at the same time. When grain is in medium dimension (18 µm), the best impact toughness of 51 J/cm2occurs with corresponding strength of 2034 MPa and ductility of 14%.
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DOI：
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发表时间：
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影响因子：
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