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首页> 外文会议>Iron Steel Supplement 2005 vol.40: The Joint International Conference of HSLA Steels 2005 and ISUGS 2005 >Grain Refinement and Strengthening Mechanism of Automobile Beam Steels Produced by CSP Technology
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Grain Refinement and Strengthening Mechanism of Automobile Beam Steels Produced by CSP Technology

机译：CSP技术生产的汽车钢梁的晶粒细化和强化机理

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摘要

The microstructure characteristics, mechanical properties and misorientation of automobile beam steels produced by Compact Strip Production (CSP) were investigated by use of optical microscopy (OM), transmission electron microscopy (TEM) and electron back scattered diffraction (EBSD), etc. It is shown that the final microstructure is mainly of polygonal ferrite and some pearlite, the average ferrite grain size is about 3.7～5.6 μm. At a cooling rate of 15Ks~(-1), some fraction of granular bainite appears in the microstructure and the cementite lamella of automobile beam steels is fractured and transformed into discrete cementite particles, which is distributed throughout the ferrite matrix of the hot strips. The EBSD results show that grain boundaries in ferrite are basically high-angle grain boundaries (HAGBs). The texture components are complicated and without remarkable preferred orientation. The microtexture in final strip is approximated by weak {110}< 001 > orientation, so the hot rolled austenite is deduced to be composed of mostly recrystallized austenite. Refinement strengthening is the predominant strengthening mode.
机译：利用光学显微镜（OM），透射电子显微镜（TEM）和电子反向散射衍射（EBSD）等方法研究了紧凑带材生产（CSP）生产的汽车钢的组织，力学性能和取向错误。结果表明，最终的显微组织主要为多边形铁素体和一些珠光体，平均铁素体晶粒尺寸约为3.7〜5.6μm。在15Ks〜（-1）的冷却速率下，微结构中会出现一些颗粒状贝氏体，汽车梁钢的渗碳体薄片破裂并转变为离散的渗碳体颗粒，并分布在整个热轧带钢的铁素体基体中。 EBSD结果表明，铁素体中的晶界基本上是高角度晶界（HAGB）。纹理成分很复杂，并且没有明显的首选方向。最终带钢中的微观组织近似为弱的{110} <001>取向，因此可以推断出热轧奥氏体主要由再结晶奥氏体组成。细化强化是主要的强化方式。

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