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首页> 外文会议>International pipeline conference >EFFECT OF ROLLING PARAMETERS ON THE LOW-TEMPERATURE TOUGHNESS AND MICROSTRUCTURE OF HIGH-STRENGTH LINEPIPE STEEL
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EFFECT OF ROLLING PARAMETERS ON THE LOW-TEMPERATURE TOUGHNESS AND MICROSTRUCTURE OF HIGH-STRENGTH LINEPIPE STEEL

机译：轧制参数对高强度管线钢的低温韧性和显微组织的影响

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In recent years, large-diameter pipe producers around the world have witnessed a growing interest to develop gas fields in arctic environments in order to fulfill the energy demand. High-strength linepipe grades are attractive for economic reasons, because they offer the benefit of a reduced wall thickness at a given operating pressure. Excellent low-temperature toughness of the material is essential under these conditions. Modern high-strength heavy plates used in the production of UOE pipes are produced by thermomechanical rolling followed by accelerated cooling (TMCP). The combination of high strength and high toughness of these steels is a result of the bainitic microstructure and is strongly influenced by the processing parameters. For this reason, the relationship between rolling and cooling parameters of heavy plate production, the low-temperature toughness and the microstructure is at the center of attention of the development efforts at Salzgitter Mannesmann Forschung (SZMF) in collaboration Salzgitter Mannesmann Grobblech (SMGB). It has been shown previously that a variation of the processing parameters has a direct influence on the microstructure and correlates with mechanical properties that are accessible via small-scale tests. Modern characterization methods such as scanning electron microscopy in combination with electron backscatter diffraction have broadened our understanding of the underlying mechanisms and have helped to define processing conditions for the production of heavy plates with optimized low-temperature toughness in small scale tests. Within the present paper, the results of a recent laboratory investigation of the effect of a systematic variation of rolling parameters on the microstructure and low-temperature toughness of as-rolled and pre-strained Charpy specimens are discussed. In these trials, final rolling temperatures above the onset of the ferrite-austenite transformation and cooling stop temperatures above the martensite start temperature were selected. The microstructure of the plates was investigated by scanning electron microscopy and electron backscatter diffraction. In a series of Charpy tests in a specific temperature range, it was found that plate material in the as-rolled condition is not strongly sensitive to variations of the selected processing parameters, whereas pre-straining the Charpy specimens made it possible to assess the potential of individual processing concepts particularly with regard to low-temperature toughness. In addition to Charpy testing, the toughness was also quantified via instrumented drop-weight tear (DWT) testing. By comparing total energy values from regular pressed-notch DWT-test specimens to J-integral values determined in drop-weight testing of pre-fatigued DWT-test specimens, the impact of variations of specimen type on material tearing resistance is shown.
机译：近年来，世界各地的大口径管道生产商目睹了为满足能源需求而在北极环境中开发气田的浓厚兴趣。出于经济原因，高强度管线管产品具有吸引力，因为它们在给定的工作压力下具有减小壁厚的优势。在这些条件下，出色的材料低温韧性至关重要。用于UOE管道生产的现代高强度厚板是通过热机械轧制，然后进行加速冷却（TMCP）来生产的。这些钢的高强度和高韧性的结合是贝氏体组织的结果，并且受到加工参数的强烈影响。因此，厚板生产的轧制和冷却参数，低温韧性和显微组织之间的关系成为Salzgitter Mannesmann Forschung（SZMF）与Salzgitter Mannesmann Grobblech（SMGB）合作开发工作的重点。先前已经表明，加工参数的变化对微观结构有直接影响，并且与可通过小规模测试获得的机械性能相关。诸如扫描电子显微镜结合电子反向散射衍射等现代表征方法，拓宽了我们对潜在机理的理解，并帮助定义了在小规模试验中生产具有优化的低温韧性的厚板的加工条件。在本文中，讨论了轧制参数的系统变化对轧制和预应变夏比试样的显微组织和低温韧性的影响的最新实验室研究结果。在这些试验中，选择的最终轧制温度高于铁素体-奥氏体转变的开始温度，冷却停止温度高于马氏体起始温度。通过扫描电子显微镜和电子反向散射衍射研究板的微观结构。在特定温度范围内进行的一系列夏比试验中，发现轧制条件下的板材对所选加工参数的变化不很敏感，而对夏比试样进行预应变则有可能评估其潜力。各个加工概念，特别是低温韧性方面的概念。除夏比测试外，还通过仪器的落锤撕裂度（DWT）测试对韧性进行了量化。通过将常规压痕DWT测试样品的总能量值与在预疲劳DWT测试样品的落锤测试中确定的J积分值进行比较，显示了样品类型变化对材料抗撕裂性的影响。

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