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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >Improvement of strength-toughness combination in austempered low carbon bainitic steel: The key role of refining prior austenite grain size
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Improvement of strength-toughness combination in austempered low carbon bainitic steel: The key role of refining prior austenite grain size

机译：奥斯特型低碳贝氏体钢强度 - 韧性组合的提高：精炼先前奥氏体粒度的关键作用

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摘要

A low carbon bainitic steel with ultrahigh strength of similar to 1650 MPa and elongation and toughness of similar to 16% and similar to 72 J/cm(2) respectively, was obtained through austempering. The resulting microstructure and mechanical properties for varying prior austenite grain size (PAGS) are described. The refinement of the PAGS resulted in finer packet/block size, higher volume fraction and higher stability of retained austenite. The coalescence of bainitic laths was effectively hindered when the prior austenite grain size (FAGS) was refined to similar to 10 mu m. On the other hand, the coalescence of bainitic laths with crystallographically homogeneous characteristic was accompanied by disappearance of film-like retained austenite and crack can propagate without inhibition, which is detrimental to toughness. Eliminating the coalescence of bainite and increasing the volume fraction of retained austenite and its stability by means of refining PAGS contributed to ultrahigh strength high ductility and toughness combination. (C) 2017 Elsevier B.V. All rights reserved.
机译：通过尊重，通过尊重，具有与1650MPa的超高强度的低碳壳体钢和类似于16％且相似的韧性，与72J / cm（2）相似。描述了用于改变的改变的先前奥氏体粒度（PAG）的所得微观结构和机械性能。 PAG的细化导致更细的分组/块尺寸，更高的体积分数和保留奥氏体的稳定性更高。当先前奥氏体粒度（FAG）精制到10μm时，有效地阻碍了贝氏体板条的聚结。另一方面，具有晶体类均相特性的伯氏体板条的聚结伴随着膜状保留奥氏体的消失，并且裂纹可以在不抑制的情况下繁殖，这对韧性有害。消除贝氏体的聚结并增加保留奥氏体的体积分数及其稳定性通过精炼PAG促进超高强度高延展性和韧性组合。 （c）2017年Elsevier B.V.保留所有权利。

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