The Effect of Sulfate on Environmental Cracking in Boiling Water Reactors Under Constant Load or Fatigue
The Effect of Sulfate on Environmental Cracking in Boiling Water Reactors Under Constant Load or Fatigue
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硫酸盐对恒载或疲劳下沸水反应堆环境开裂的影响
DOI：
10.5006/1.3585162
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发表时间：
1990
期刊：
影响因子：
--
通讯作者：
M. Trolle
中科院分区：
文献类型：
--
作者：
L. Ljungberg;D. Cubicciotti;M. Trolle
在模拟沸水反应堆(BWR)环境中，对敏化型304(UNS S30400)不锈钢、316型核级(NG)不锈钢和镍基合金600(UNS N06600)进行了0.8和0.9载荷比的低频疲劳试验和恒定载荷试验。这些环境模拟正常水化学(NWC)和氢水化学(HWC)，氧气为15或5 ppb，清洁或有硫酸盐。在疲劳载荷条件下，304不锈钢和600合金的氧增强开裂，而不是316 NG。在恒定载荷条件下，清洁环境中的裂纹扩展总是非常低的。硫酸盐对所有三种材料的开裂都有促进作用，304 SS型最多，316 NG型最少。在恒定载荷下，0.1ppm硫酸盐对裂纹的强化作用比在疲劳载荷条件下更差，对于NWC中的304钢，在恒定载荷下达到100倍，在疲劳条件下达到10倍。
Abstract Low-frequency fatigue tests at load ratios 0.8 and 0.9 and constant load tests were run on sensitized type 304 (UNS S30400) stainless steel (SS), type 316 nuclear grade (NG) SS and the nickel-base alloy 600 (UNS N06600) in simulated boiling water reactor (BWR) environments. The environments simulated normal water chemistry (NWC) and hydrogen water chemistry (HWC) with 15 or 5 ppb O2, clean or with sulfate. Oxygen enhanced cracking of type 304 SS and alloy 600, but not type 316 NG, under fatigue load conditions. Under constant load conditions, crack propagation was always very low in clean environments. Sulfate enhanced cracking in all three materials, most in type 304 SS and least in type 316 NG. Crack enhancement due to 0.1 ppm sulfate was worse under constant load than under fatigue load conditions, for type 304 SS in NWC up to a factor of 100 in constant load and up to a factor of 10 in fatigue.