Effect of deformation twinning on dissolution corrosion of 316L stainless steels in contact with static liquid lead-bismuth eutectic (LBE) at 500 °C
Effect of deformation twinning on dissolution corrosion of 316L stainless steels in contact with static liquid lead-bismuth eutectic (LBE) at 500 °C
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DOI：
10.1016/j.jnucmat.2018.08.030
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发表时间：
2018-11
影响因子：
3.1
通讯作者：
Oksana Klok;K. Lambrinou;S. Gavrilov;E. Stergar;Jun Lim;T. Donck;W. Renterghem;I. Graeve
中科院分区：
文献类型：
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作者：
Oksana Klok;K. Lambrinou;S. Gavrilov;E. Stergar;Jun Lim;T. Donck;W. Renterghem;I. Graeve
本文研究了变形孪晶对316 L奥氏体不锈钢与静态液态铅铋共晶（LBE）接触时溶解腐蚀行为的影响。为此，将具有明显不同变形孪晶密度的塑性变形316 L钢试样同时暴露于贫氧（<10−13mass%）静态液态LBE中，温度为500 °C，时间为1000 h 。变形孪晶密度的变化是通过在单轴拉伸下加载相同的316 L钢制成的塑性变形程度相似（8-10%）的试样来实现的。在- 150、25和150 ℃下进行拉伸加载，影响孪晶密度，随着塑性变形温度的降低孪晶密度增大。溶解腐蚀是lbe暴露钢试样中唯一观察到的液态金属腐蚀机制。随着变形孪晶密度的增加，溶化影响区厚度增大，在- 150 °C变形的316 L钢试样中溶化影响区厚度最大，在150 °C变形的316 L钢试样中溶化影响区厚度最小。变形孪晶界加速了LBE进入钢体，其相对于钢试件表面的局部取向影响了溶蚀影响区的厚度。
This work addresses the effect of deformation twinning on the dissolution corrosion behaviour of 316 L austenitic stainless steels in contact with static liquid lead-bismuth eutectic (LBE). For this purpose, plastically deformed 316 L steel specimens with distinctly different deformation twin densities were simultaneously exposed to oxygen-poor (<10−13mass%) static liquid LBE for 1000 h at 500 °C. The variation in deformation twin density was achieved by loading in uniaxial tension to similar degrees of plastic deformation (8–10%) specimens made of the same 316 L steel heat. Tensile loading was carried out at −150, 25 and 150 °C so as to affect the twin density, which increased as the temperature of plastic deformation decreased. Dissolution corrosion was the only liquid metal corrosion mechanism observed in the LBE-exposed steel specimens. The thickness of the dissolution-affected zone increased with the deformation twin density, which was highest in the 316 L steel specimen deformed at −150 °C and lowest in the one deformed at 150 °C. As deformation twin boundaries accelerated the LBE ingress into the steel bulk, their local orientation with respect to the steel specimen surface affected the thickness of the dissolution-affected zone.