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首页> 美国卫生研究院文献>Materials >Stress Corrosion Behaviors of 316LN Stainless Steel in a Simulated PWR Primary Water Environment
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Stress Corrosion Behaviors of 316LN Stainless Steel in a Simulated PWR Primary Water Environment

机译：316LN不锈钢在模拟压水堆原水环境中的应力腐蚀行为

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The effect of the strain rate, experimental temperature, Zn content in the test solution, and prefilming time on the mechanical properties was investigated by a tensile test with a slow strain rate, at a chemical solution of 2.2 ppm Li and 1200 ppm B in a static autoclave with 8.2 MPa. The experimental parameters clearly affected the tensile properties. The surface morphology, fractograph, and cross-sectional microstructure were analyzed by scanning electron microscopy and transmission electron microscopy. The δ (elongation) and UTS (ultimate tensile strength) of the samples tested in chemical solution were obviously lower than those of the samples tested under a nitrogen atmosphere. However, in general, all samples showed a ductile fracture characteristic and an excellent tensile property in all experimental conditions. The δ and UTS were first increased with increasing Zn content, and then decreased at both conditions of 9.26 × 10−7/s and 4.63 × 10−7/s strain rates. The difference values of tensile properties at different strain rates showed fluctuations with increasing Zn content. The δ increased with both increasing experimental temperature and prefilming time. The UTS first decreased with increasing prefilming time and then increased. The Iscc (stress corrosion cracking susceptibility) decreased with an increasing strain rate, experiment temperature, and prefilming time. Many particles with polyhedrons were formed on the sample surfaces, which was attributed to corrosion in a periodical location at the sample surface. The average length of the particles decreased with increasing Zn content, but increased with both increasing experimental temperatures and prefilming time. The corresponding mechanism is also discussed in this work.
机译：在2.2 ppm Li和1200 ppm B的化学溶液中，通过缓慢应变速率的拉伸试验，研究了应变速率，实验温度，测试溶液中的Zn含量和预膜时间对机械性能的影响。 8.2 MPa的静态高压釜。实验参数明显影响了拉伸性能。通过扫描电子显微镜和透射电子显微镜分析表面形态，断口形貌和横截面显微结构。在化学溶液中测试的样品的δ（伸长率）和UTS（最终拉伸强度）明显低于在氮气氛下测试的样品。但是，一般而言，所有样品在所有实验条件下均显示出韧性断裂特性和优异的拉伸性能。 δ和UTS首先随着锌含量的增加而增加，然后在9.26×10 −7 / s和4.63×10 −7 / s的两个应变率下均降低。不同应变率下的拉伸性能差异值随锌含量的增加而波动。 δ随实验温度和预成膜时间的增加而增加。随着预成膜时间的增加，UTS首先下降，然后上升。随着应变率，实验温度和预膜时间的增加，Iscc（应力腐蚀开裂敏感性）降低。在样品表面上形成了许多带有多面体的颗粒，这归因于样品表面周期性位置的腐蚀。颗粒的平均长度随Zn含量的增加而减少，但随实验温度和预成膜时间的增加而增加。在这项工作中还将讨论相应的机制。

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