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Evaluation of long-term creep damage in high Cr ferritic steel welds

机译：高铬铁素体钢焊缝的长期蠕变损伤评估

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摘要

The creep strength of high Cr ferritic heat-resistant steel welds decreases due to the formation of Type IV creep damage in the heat affected zone (HAZ) during long-term service at high temperatures. In order to elucidate the processes of Type TV creep damage, creep rupture and creep interruption tests using ASME Gr.91 and Gr.122 steel welds were conducted. It was found that creep voids formed at an early stage (0.2 of life) and coalesced to form a macro crack at 0.8 of life for the Gr.91 steel weld. On the other hand, for the Gr.122 steel weld, a small number of Type IV creep voids formed at 0.5 of life, increased slightly until 0.9 of life and rapid crack growth occurred after that. Differences of creep damage behaviour between the Gr.91 and Gr.122 steel welds are discussed. The Type TV creep damage distributions obtained were compared with analytical results using the finite element method and damage mechanics.
机译：高铬铁素体耐热钢焊缝的蠕变强度由于在高温下长期使用期间在热影响区（HAZ）中形成的IV型蠕变破坏而降低。为了阐明TV型蠕变损伤的过程，使用ASME Gr.91和Gr.122钢焊缝进行了蠕变断裂和蠕变中断测试。结果发现，对于Gr.91钢焊缝，蠕变空洞在早期（寿命为0.2）形成，并在寿命为0.8时聚结形成宏观裂纹。另一方面，对于Gr.122钢焊缝，少量的IV型蠕变空洞在寿命为0.5时形成，并在寿命为0.9时略有增加，此后出现了快速的裂纹扩展。讨论了Gr.91和Gr.122钢焊缝之间蠕变损伤行为的差异。使用有限元法和损伤力学将获得的TV型蠕变损伤分布与分析结果进行比较。

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