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Creep Fracture Analysis of W Strengthened High Cr Steel Weldment

机译：W强化高Cr钢焊缝的蠕变断裂分析

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摘要

Type Ⅳ cracking in heat affected zone (HAZ) of weldment is a problem for advanced high Cr ferritic steels. The present paper investigates the creep properties and microstructures of W strengthened P122 steel weldment at 923K. From the investigation of creep properties of simulated HAZ, it is clarified that heating up to around Ac_3 during welding minimized the grain size and creep strength. Most of the welded joint specimens were type Ⅳ fractured in fine-grained HAZ and resulted in shorter creep lives than those of the base metals. Electron beam welded joint with very narrow HAZ also showed the brittle type Ⅳ fracture due to the formation of creep voids and cracks. The growth of intergranular precipitates was faster for fine-grained HAZ. On the basis of experimental results, the FEM code that simulates type Ⅳ crack growth behavior has been developed. The vacancy diffusion under multi-axial stress condition in HAZ of weldment is analyzed.
机译：对于高级高Cr铁素体钢，焊件热影响区（HAZ）中的Ⅳ型开裂是一个问题。本文研究了W增强P122钢在923K时的蠕变性能和显微组织。从对模拟热影响区的蠕变特性的研究中可以看出，在焊接过程中加热至Ac_3左右可使晶粒尺寸和蠕变强度最小。大多数焊接接头试样均在细晶粒的热影响区中断裂为Ⅳ型，因此其蠕变寿命比贱金属短。具有极窄热影响区的电子束焊接接头也由于蠕变空隙和裂纹的形成而显示出Ⅳ型脆性断裂。对于细粒热影响区，晶间沉淀物的生长更快。根据实验结果，开发了模拟Ⅳ型裂纹扩展行为的FEM代码。分析了焊件热影响区中多轴应力条件下的空位扩散。

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