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首页> 外文期刊>Materials Science and Engineering >Microstructural characteristics and toughness of the simulated coarse grained heat affected zone of high strength low carbon bainitic steel
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Microstructural characteristics and toughness of the simulated coarse grained heat affected zone of high strength low carbon bainitic steel

机译：高强度低碳贝氏体钢模拟粗粒热影响区的组织和韧性

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摘要

The correlation of microstructural characteristics and toughness of the simulated coarse grained heat affected zone (CGHAZ) of low carbon bainitic steel was investigated in this study. The toughness of simulated specimens was examined by using an instrumented Charpy impact tester after the simulation welding test was conducted with different cooling times. Microstructure observation and crystallographic feature analysis were conducted by means of optical microscope and scanning electron microscope equipped with electron back scattered diffraction (EBSD) system, respectively. The main microstructure of simulated specimen changes from lath martensite to coarse bainite with the increase in cooling time. The deterioration of its toughness occurs when the cooling time ranges from 10 to 50 s compared with base metal toughness, and the toughness becomes even worse when the cooling time increases to 90 s or more. The MA (martensite-austenite) constituent is primary responsible for the low toughness of simulated CGHAZ with high values of cooling time because the large MA constituent reduces the crack initiation energy significantly. For crack propagation energy, the small effective grain size of lath martensite plays an important role in improving the crack propagation energy. By contrast, high misorientation packet boundary in coarse bainite seems to have few contributions to the improvement of the toughness because cleavage fracture micromechanism of coarse bainite is mainly controlled by crack initiation.
机译：研究了低碳贝氏体钢模拟粗晶粒热影响区（CGHAZ）的组织与韧性之间的关系。在不同的冷却时间下进行模拟焊接测试后，使用仪器化的夏比冲击测试仪检查模拟样品的韧性。分别通过配备电子背散射衍射（EBSD）系统的光学显微镜和扫描电子显微镜进行显微结构观察和晶体学特征分析。随着冷却时间的增加，模拟试样的主要显微组织从板条马氏体变为粗贝氏体。与母材韧性相比，冷却时间在10〜50s范围内时，韧性降低，在冷却时间增加到90s以上时，韧性变得更差。 MA（马氏体-奥氏体）成分是造成模拟CGHAZ韧性低，冷却时间长的主要原因，因为较大的MA成分会显着降低裂纹萌生能。对于裂纹扩展能量，板条马氏体的有效晶粒尺寸小，对提高裂纹扩展能量起着重要作用。相比之下，粗贝氏体中较高的取向差包边界似乎对韧性的改善几乎没有贡献，因为粗贝氏体的劈裂断裂微观机制主要由裂纹萌生控制。

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