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首页> 外文期刊>Materiali in Tehnologije >RELATIONSHIP BETWEEN A BAINITIC STRUCTURE AND THE HARDNESS IN THE WELD ZONE OF THE FRICTION-STIR WELDED X80 API-GRADE PIPE-LINE STEEL
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RELATIONSHIP BETWEEN A BAINITIC STRUCTURE AND THE HARDNESS IN THE WELD ZONE OF THE FRICTION-STIR WELDED X80 API-GRADE PIPE-LINE STEEL

机译：X80 API牌级梯度管线钢焊接基区中贝氏体组织与硬度的关系

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摘要

The present study focuses on the morphology of the weld zone, especially on the quantitative microstructural characterization of bainitic structures, and the relationship between post-weld bainitic structures and the hardness at the weld zone of the friction-stir welded X80 API-grade pipe-line steel. The employed rotating and traverse speeds of the polycrystalline cubic boron nitride tool during the friction-stir welding process were 350 r/min and 12.7 cm/min (5 inch per minute), respectively. A microstructural analysis of the weld was carried out using optical microscopy, orientation imaging microscopy and transmission electron microscopy, and the hardness variation was also mapped across the weld-plate cross section. The frictional heat and plastic flow during friction-stir welding create a granular bainitic structure (the stir zone), a lath-like upper bainitic structure (the hard zone) and a recrystallized equiaxed polygonal ferritic structure (the heat-affected zone) in the weld zone. The maximum hardness was observed in the classical upper bainitic microstructure in the hard zone. The minimum hardness was found in the heat-affected zone. A good correlation between the post-weld bainitic structures and the hardness in the weld zone was obtained; the hardness increases almost linearly with the decreasing bainite-lath and packet sizes.
机译：本研究着重于焊接区的形貌，尤其是贝氏体组织的定量微观结构表征，以及焊接后的贝氏体组织与搅拌摩擦焊接的X80 API级管材的焊接区硬度之间的关系。线钢。在搅拌摩擦焊接过程中，多晶立方氮化硼工具使用的旋转速度和移动速度分别为350 r / min和12.7 cm / min（5英寸/分钟）。使用光学显微镜，取向成像显微镜和透射电子显微镜对焊缝进行显微组织分析，并在整个焊接板横截面上绘制硬度变化图。搅拌摩擦焊接过程中的摩擦热和塑性流在焊缝中形成粒状贝氏体结构（搅拌区），板条状上贝氏体结构（硬区）和重结晶的等轴多边形铁素体结构（热影响区）。焊接区。在硬区的经典上贝氏体显微组织中观察到最大硬度。在热影响区发现最低硬度。焊后贝氏体组织与焊接区硬度之间具有良好的相关性;硬度随贝氏体板条和包装尺寸的减小而线性增加。

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