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从微观结构角度对超超临界机组用新型T92异种钢焊接接头常温力学性能和高温蠕变性能进行了研究。首先针对焊接接头力学性能与微观结构关系展开讨论,然后对其高温蠕变断裂失效机制进行了系统的分析。分析结果发现,晶粒尺寸与晶粒取向是影响焊接接头常温力学性能的关键因素;空穴形核位置则决定了焊接接头的蠕变断裂方式。
From the microstructure point of view, the ultra-supercritical units with a new type T92 dissimilar steel welded joints at room temperature mechanical properties and high temperature creep properties were studied. Firstly, the relationship between mechanical properties and microstructure of welded joints was discussed, and then the failure mechanism of creep rupture at high temperature was systematically analyzed. The results show that the grain size and grain orientation are the key factors affecting the mechanical properties at room temperature of the welded joint. The location of the hole nucleation determines the creep rupture mode of the welded joint.