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首页> 外文会议>International Conference on Pressure Vessel Technology >Heavy section 9Cr-IMo steel plate with improved weldability and creep rupture strength of welded joints
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Heavy section 9Cr-IMo steel plate with improved weldability and creep rupture strength of welded joints

机译：重型9CR-IMO钢板，可焊接的可焊性和蠕变破裂强度

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Effect of alloying elements en weld cracking susceptibility and toughness of the heat affected zone (HAZ) were studied on 9Cr-1Mo steels for tube sheet and shell plate of Fast Breeder Reactor (FBR).A mechanism of ferrite formation during welding and creep rupture strength of welded joints was also discussed.The results are shown as follows1) The results observed in the microstructure of the HAZ of 9Cr steels welded by GTAW or SAW is regarded as delta ferrite, and the delta ferrite content decreases with the increase in heat input up to a critical cooling rate( γ→α transformation).2) Reducing the ferrite content is effective for improving HAZ toughness. Higher contents of ferrite are found in the coarse grain region of HAZ than in the base metal. Controlling the ferrite content in welds is important in alloy design of 9Cr-steel inorder to obtain high toughness both in base metal and in welds.3) A large difference in creep strength between the softened zone of welds and the base metal brings about strain concentration to the weak softened zone, resulting deterioration in creep strength of welded joints.4) 20, 50, 250, 300 and 550 mm thickness 9Cr-1Mo-V-Nb steel plates were manufactured by commercial scale, They exhibited excellent toughness, a high weld cracking resistance and a high creep rupture strength of welded joints.
机译：在快速育种反应器（FBR）的9Cr-1Mo钢上，研究了焊接元件抗焊接区（HAZ）的焊接裂缝敏感性和韧性的焊接敏感区（HAZ）。焊接和蠕变破裂强度的铁氧体形成机理。还讨论了焊接接头。结果如下所示，在GTAW或SAW焊接的9CR钢的HAZ中观察到的结果被认为是Delta铁氧体，并且随着热量的增加，Delta铁氧体含量随着热量的增加而降低临界冷却速率（γ→α变换）.2）降低铁氧体含量对于改善HAZ韧性是有效的。在HAZ的粗粒区域中发现了较高的铁氧体含量而不是基础金属。控制焊缝中的铁氧体含量在9Cr钢的合金设计中是重要的，以获得基础金属和焊缝中的高韧性.3）焊接区软化区和基础金属之间的蠕变强度的大差异是应变浓度通过商业规模制造了焊接接头的蠕变强度，导致焊接接头蠕变强度的衰弱，导致焊接接头的衰退.4）20,50,250,300和550mm厚度9Cr-1Mo-V-NB钢板。焊接抗裂性和焊接接头的高蠕变破裂强度。

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