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首页> 外文期刊>Materials Characterization >Effect of austenite grain size on the bainitic ferrite morphology and grain refinement of a pipeline steel after continuous cooling
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Effect of austenite grain size on the bainitic ferrite morphology and grain refinement of a pipeline steel after continuous cooling

机译：奥氏体晶粒尺寸对连续冷却后贝氏体铁氧体形态和晶粒细化的影响

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摘要

The effect of prior-austenite grain size (PAGS) on bainitic ferrite (BF) morphology and effective grain size in a pipeline steel under an industrial cooling condition was investigated. With PAGSs of 223 mu m and 37.0 mu m, BF laths with a parallel morphology could be seen, while as the PAGS is increased to 52.4 mu m or 62.8 mu m, more interlocking BF microstructures were observed. Detailed crystallographic analysis identified that intense BF variant selection occurs for the small-grained austenite, but due to the large austenite grain quantity, and thus the large total austenite grain boundary area per unit volume of the small-grained austenite, with the reduction of PAGS from 62.8 mu m to 22.3 mu m, the effective grain size of the transformed microstructure gradually decreases from 9.5 mu m to 5.6 mu m. The small-grained austenite transformation was dominated by one close-packed plane (CP) group, but for the larger austenite grain, different CP groups were observed to be adjacent to each other, producing the interlocking structure. A mechanism based on the carbon distribution near the BF/austenite interface is proposed to account for this difference. (C) 2016 Elsevier Inc. All rights reserved.
机译：研究了在工业冷却条件下在管道钢中对贝氏体铁氧体（BF）形态（BF）形态和有效粒度的效果。对于223μm和37.0μm的PAG，可以看到具有平行形态的BF板条，而随着PAG增加到52.4μm或62.8μm，观察到更多互锁的BF微观结构。鉴定出浓度的奥氏体的强烈BF变体选择，但由于奥氏体粒量大，因此，具有小颗粒奥氏体的大量奥氏体晶界面积，减少了PAG从62.8μm至22.3μm，转化的微观结构的有效粒度逐渐从9.5 mu m逐渐降低至5.6μm。小颗粒奥氏体转化由一个封闭的平面（CP）组主导，但对于较大的奥氏体晶粒，观察到不同的CP组彼此相邻，产生互锁结构。提出了一种基于BF / AUSTENITE接口附近的碳分布的机制，以解释这种差异。 （c）2016年Elsevier Inc.保留所有权利。

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