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首页> 外文期刊>Journal of Materials Engineering and Performance >The Microstructure Evolution of Dual-Phase Pipeline Steel with Plastic Deformation at Different Strain Rates
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The Microstructure Evolution of Dual-Phase Pipeline Steel with Plastic Deformation at Different Strain Rates

机译：不同应变率塑性变形双相管线钢的微观结构演化

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摘要

Tensile properties of the high-deformability dual-phase ferrite-bainite X70 pipeline steel have been investigated at room temperature under the strain rates of 2.5 x 10(-5), 1.25 x 10(-4), 2.5 x 10(-3), and 1.25 x 10(-2) s(-1). The microstructures at different amount of plastic deformation were examined by using scanning and transmission electron microscopy. Generally, the ductility of typical body-centered cubic steels is reduced when its stain rate increases. However, we observed a different ductility dependence on strain rates in the dual-phase X70 pipeline steel. The uniform elongation (UEL%) and elongation to fracture (EL%) at the strain rate of 2.5 x 10(-3) s(-1) increase about 54 and 74%, respectively, compared to those at 2.5 x 10(-5) s(-1). The UEL% and EL% reach to their maximum at the strain rate of 2.5 x 10(-3) s(-1). This phenomenon was explained by the observed grain structures and dislocation configurations. Whether or not the ductility can be enhanced with increasing strain rates depends on the competition between the homogenization of plastic deformation among the microconstituents (ultra-fine ferrite grains, relatively coarse ferrite grains as well as bainite) and the progress of cracks formed as a consequence of localized inconsistent plastic deformation.
机译：在室温下在2.5×10（ - 5），1.25×10（-4），2.5×10（-3）的温度下在室温下研究了高可变性双相铁素体 - 贝氏体X70管道钢的拉伸性能，1.25 x 10（-2）s（-1）。通过使用扫描和透射电子显微镜检查不同量的塑性变形的微观结构。通常，当其污渍​​速率增加时，典型的体为立方钢的延展性降低。然而，我们观察到了不同的延展性对双相X70管道钢中应变速率的不同延性依赖性。与2.5×10相比，均匀伸长率（uel％）和裂缝（El％）以2.5×10（-3）的菌株（-1）的菌株增加约54和74％（ - 5）S（-1）。 UEL％和EL％以2.5×10（-3）S（-1）的应变率达到最大值。观察到的晶粒结构和位错配置解释了这种现象。随着应变率的增加，延展性是否可以增强，这取决于微耦合剂塑性变形的均质化（超细铁氧体晶粒，相对粗糙的铁氧体颗粒以及贝氏体）之间的竞争以及所形成的裂缝的进展局部不一致的塑性变形。

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