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首页> 外文期刊>Metallurgical and materials transactions. A, physical metallurgy and materials science >Microstructures Relevant to Brittle Fracture Initiation at the Heat-Affected Zone of Weldment of a Low Carbon Steel
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Microstructures Relevant to Brittle Fracture Initiation at the Heat-Affected Zone of Weldment of a Low Carbon Steel

机译：低碳钢焊接热影响区脆性断裂引发的微观组织

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Charpy toughness of the heat-affected zone (HAZ) of weldment of a low carbon steel has been investigated by means of an instrumented Charpy test and fractographic analysis. Microstructures were varied with thermal cycles simulating double-pass welding. The ductile-brittle transition temperature is the most deteriorated at an intermediate second-cycle heating temperature. The origin of the difference in the transition temperatures has been analyzed to exist in the brittle fracture initiation stage. Fractographic examination correlating with microstructural features has revealed that the brittle fracture initiation site is associated with the intersection of bainitic ferrite areas with different orientations rather than the martensite-austenite constituents. The role of the constraint of plastic deformation on the brittle fracture initiation is discussed.
机译：低碳钢焊接件的热影响区（HAZ）的夏比韧性已经通过仪器化的夏比测试和分形分析进行了研究。微观结构随模拟双道次焊接的热循环而变化。在中间第二循环加热温度下，韧性-脆性转变温度最劣化。分析了转变温度差异的根源存在于脆性断裂的起始阶段。与微观结构特征相关的分形检查​​表明，脆性断裂的起始部位与具有不同取向的贝氏体铁素体区域的交点有关，而不与马氏体-奥氏体成分有关。讨论了塑性变形约束对脆性断裂萌生的作用。

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