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首页> 外文会议>Association for Iron amp; Steel Technology(AIST) Process Metallurgy, Product Quality and Applications Proceedings; 20040926-29; New Orleans,LA(US) >Effect of Carbide Formation on the Microstructure and Texture of Warm Rolled and Annealed Low Carbon Steels Containing Cr and B
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Effect of Carbide Formation on the Microstructure and Texture of Warm Rolled and Annealed Low Carbon Steels Containing Cr and B

机译：碳化物的形成对含Cr和B的热轧退火低碳钢组织和织构的影响

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摘要

The development of the desirable ND fibre, which is responsible for high r-values in warm rolled and annealed steels, has been associated with the presence in the microstructure after rolling of a high volume fraction of grains containing shear bands. These shear bands then become preferential nucleation sites for ND fibre grains during subsequent annealing. In the current work, the effect of chromium and boron addition on the microstructure and on texture formation was studied in a warm rolled and annealed low carbon steel. Optical microscopy, electron backscattering diffraction and scanning and transmission electron microscopy were employed. All the warm rolling microstructures consisted of polygonal ferrite grains. The addition of the chromium and boron led to the formation of coarse Cr_(23)C_6 carbides and fine strain-induced Cr_(23)C_6, C_3C_2 and B_(49)C_2 precipitates. The latter affected the microband thickness, dislocation density and stored energy. As a result, the rate of work hardening and the number of grains containing shear bands increased in the Cr alloyed steels. This produced a higher fraction of the ND fibre in the annealing texture of the Cr-containing steels compared to the unmodified steel.
机译：理想的ND纤维的发展与热轧和退火钢中的高r值有关，这种发展与轧制大量体积的含剪切带的晶粒后微观结构中的存在有关。然后，这些剪切带在随后的退火过程中成为ND纤维晶粒的优先成核位点。在当前的工作中，在热轧和退火的低碳钢中研究了铬和硼的添加对组织和织构形成的影响。使用了光学显微镜，电子反向散射衍射以及扫描和透射电子显微镜。所有的热轧组织都由多边形铁素体晶粒组成。铬和硼的添加导致形成粗大的Cr_（23）C_6碳化物和细致的Cr_（23）C_6，C_3C_2和B_（49）C_2析出物。后者影响了微带的厚度，位错密度和存储的能量。结果，在Cr合金钢中，加工硬化速率和包含剪切带的晶粒数量增加。与未改性钢相比，这在含铬钢的退火织构中产生了更高比例的ND纤维。

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