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首页> 外文期刊>Journal of the Brazilian Society of Mechanical Sciences and Engineering >The microstructures, mechanical properties, and temperature distributions in nodular cast iron friction-welded joint
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The microstructures, mechanical properties, and temperature distributions in nodular cast iron friction-welded joint

机译：球墨铸铁摩擦焊接接头的组织，力学性能和温度分布

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The paper focuses on an experimental topic relating to the field of friction welding process of a nodular cast iron. The microstructures, phase transformation, temperature distributions, microhardness, and tensile test are all studied within the framework of the paper in question. Maximum temperature measurements in the axial center and periphery of the analyzed joints were equal to 950 and 840?°C, respectively. Both temperature and increasing temperature gradient at the axial center were higher than those at the periphery. The maximum tensile strength of the examined friction-welded nodular cast iron joints was 53% of that of the parent metal. The welding region was composed of deformed graphite nodules, coarse pearlite, proeutectoid ferrite, and acicular martensite. Highly deformed graphite nodules were distributed along the weld interface due to the material flow in the thermo-mechanically affected zone (TMAZ). In the central zone, graphite displayed a striped configuration and ferrite transformed into a martensite structure. In the peripheral region, graphite surrounded by martensite kept the form of individual granules. Maximum hardness at the interface in the TMAZ and the heat-affected zone reached 603 HV and 345 HV, respectively. The executed microstructure analysis showed that the cracks started occurring mostly at the interface of the deformed graphite nodules and then spread through the grain boundaries of metal matrix. The fracture surface appearance showed a cleavage fracture in the peripheral zone and a little dimple fracture around graphite nodules in the central zone.
机译：本文重点研究与球墨铸铁摩擦焊接工艺领域有关的实验主题。微观结构，相变，温度分布，显微硬度和拉伸试验都在所讨论的论文框架内进行了研究。在分析的接头轴向中心和外围的最高温度测量值分别等于950和840？C。轴向中心的温度和增加的温度梯度均高于周围的温度和温度梯度。所检查的摩擦焊接球墨铸铁接头的最大抗拉强度为母金属的53％。焊接区域由变形石墨结核，粗珠光体，共析铁素体和针状马氏体组成。由于材料在热机械影响区（TMAZ）中的流动，高度变形的石墨结核沿着焊接界面分布。在中心区域，石墨呈条纹状，铁素体转变为马氏体结构。在外围区域，被马氏体包围的石墨保持了单个颗粒的形式。 TMAZ和热影响区界面的最大硬度分别达到603 HV和345 HV。进行的显微组织分析表明，裂纹主要发生在变形石墨结节的界面处，然后扩展到金属基体的晶界。断口的外观显示在周边区域有劈裂断裂，而在中央区域的石墨结节周围有一点凹痕断裂。

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