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首页> 外文会议>European corrosion congress;EUROCORR 2011 >Effects of Cold Working Ratio and Stress Intensity Factor on Intergranular Stress Corrosion Cracking Susceptibility of Nonsensitized Austenitic Stainless Steels in Simulated BWR and PWR Primary Water
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Effects of Cold Working Ratio and Stress Intensity Factor on Intergranular Stress Corrosion Cracking Susceptibility of Nonsensitized Austenitic Stainless Steels in Simulated BWR and PWR Primary Water

机译：冷加工比和应力强度因子对模拟水冷压水和压水堆原水中非敏化奥氏体不锈钢晶间应力腐蚀开裂敏感性的影响

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To evaluate the effects of cold working ratio, stress intensity factor and water chemis try on IGSCC susceptibility of non-sensitized austenitic stainless steel, constant dis placement DCB specimens of three types of austenitic stainless steel, Types 316L, 347 and 321, were tested in simulated BWR and PWR primary water. IGSCC was observed in both simulated BWR water and PWR primary water and was categorized into the following two types. The first type was where IGSCC propagated in the same plane as the pre-fatigue crack plane, while the second type was where IGSCC propagated in a plane perpendicular to the pre-fatigue crack plane. However, the second type of IGSCC fracture surface plane was parallel to the rolling plane of the cold rolled material. The two types of IGSCC fracture planes changed according to the combination of testing conditions (cold working ratio, stress intensity factor and simulated water chemistry). The results suggest that the most susceptible plane due to fabrication process of materials might play a significant role in IGSCC for non-sensitized, cold worked, austenitic stainless steels, especially, in simulated PWR primary water. Based on an analysis of average crack growth rates (CGRs) in the test specimens, the CGR seems to be mainly affected by the cold working ratio. In the case of simulated PWR primary water, it seems that the metallurgical aspects dominate IGSCC susceptibility. In addition, the observed CGRs in simulated BWR and PWR water generally increased with increasing amounts of strain-induced mart ensite by cold working.
机译：为了评估冷加工率，应力强度因子和水化学物对非敏化奥氏体不锈钢的IGSCC敏感性的影响，对三种类型的奥氏体不锈钢（316L，347和321型）的恒定位移DCB试样进行了测试。模拟的BWR和PWR一次水。在模拟的BWR水和PWR的原水中均观察到了IGSCC，并将其分为以下两种类型。第一种是IGSCC在与疲劳前裂纹平面相同的平面内传播，而第二种是IGSCC在与疲劳前裂纹平面垂直的平面内传播。但是，第二种IGSCC断裂面平行于冷轧材料的轧制平面。根据测试条件（冷工作比，应力强度因子和模拟水化学）的组合，两种类型的IGSCC断裂面都发生了变化。结果表明，对于非敏化，冷加工的奥氏体不锈钢，尤其是在模拟压水堆原水中，由于材料制造过程而引起的最易受影响的平面可能在IGSCC中起着重要作用。根据对试样平均裂纹扩展率（CGR）的分析，CGR似乎主要受冷加工率的影响。在模拟压水堆原水的情况下，似乎冶金学方面占主导地位的IGSCC敏感性。此外，在模拟的BWR和PWR水中观察到的CGR通常随着冷加工引起的应变诱发集散场所的增加而增加。

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