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首页> 外文期刊>Metals >A Comparative Study on the Dynamic Tensile Behavior of Nanostructured Bainitic and Quenched-Tempered Martensitic Steels
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A Comparative Study on the Dynamic Tensile Behavior of Nanostructured Bainitic and Quenched-Tempered Martensitic Steels

机译：纳米贝氏体和调质马氏体钢动态拉伸行为的比较研究

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摘要

In order to assess the dynamic tensile behavior of a newly developed three-step low-temperature-transformed bainitic microstructure, and a conventional one-step isothermal bainitic microstructure, and a quenched and tempered martensitic microstructure, a comparative research was conducted by using the dynamic tensile test. The results showed that more film-like retained austenite was obtained in the three-step low-temperature-transformed sample. The carbon content in the film-like retained austenite was found to be higher as compared to the blocky retained austenite. The dynamic tensile properties were all improved with an increase in strain rates (from 0.1 to 500 s ?1 ). However, the three-step bainitic low-temperature-transformed sample showed the most remarkable dynamic tensile properties, including ultimate tensile strength and total elongation. This is attributed to a better transformation-induced plasticity effect that is exhibited by the higher stability of the film-like retained austenite. Therefore, the present study suggests that performing a three-step low-temperature bainitic transformation promotes grain refinement and the formation of film-like retained austenite and improves the dynamic tensile properties.
机译：为了评估新开发的三步低温转变贝氏体组织，常规的一步等温贝氏体组织，淬火和回火马氏体组织的动态拉伸性能，利用动力学进行了比较研究。拉伸试验。结果表明，在三步低温转变的样品中获得了更多的膜状残留奥氏体。发现膜状残余奥氏体中的碳含量高于块状残余奥氏体。随应变率的增加（从0.1到500 s？1），动态拉伸性能都得到了改善。然而，三步贝氏体低温转变的样品表现出最显着的动态拉伸性能，包括极限拉伸强度和总伸长率。这归因于由膜状残留奥氏体的较高稳定性所表现出的更好的由相变引起的可塑性效应。因此，本研究表明进行三步低温贝氏体转变可促进晶粒细化和形成薄膜状残留奥氏体，并改善动态拉伸性能。

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