摘要:Inconel 690(TT)合金是压水反应堆蒸汽发生器传热管的关键材料之一,在压水反应堆工况下具有腐蚀疲劳开裂的风险。本文在裂纹尖端小范围屈服的条件下,研究了Inconel 690(TT)合金在模拟二回路水介质环境下的腐蚀疲劳裂纹扩展行为。研究发现:相对于室温情况下,模拟二回路水介质对疲劳裂纹扩展速率有最大3倍左右的加速作用;模拟二回水介质对疲劳裂纹扩展速率的加速作用受腐蚀疲劳裂纹非平面生长的影响,并与应力强度因子范围、最大应力强度因子及应力比密切相关。
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