Stress Corrosion Behaviors of 316LN Stainless Steel in a Simulated PWR Primary Water Environment

Abstract

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.

Characterization of PTFE Film on 316L Stainless Steel Deposited through Spin Coating and Its Anticorrosion Performance in Multi Acidic Mediums

“…The values of Ecorr and icorr were calculated by using the Gamry framework software (MULTECHEM SERIES G750). The electrochemical corrosion test was performed on the uncoated 316L SS in 13 Table 3. Table 3.…”

“…Stainless steels lack high temperature corrosion resistance in strongly aggressive media containing Cl − ions [8][9][10] and under the influence of aggressive chloride anion. The local breakdown in passivity occurs mainly at sites of local heterogeneities, causing pitting corrosion [11,12], and corrosion can also occur under high temperatures and high pressure stress [13]. For these reasons, stainless steels may need to be improved by corrosion protection.…”

Effects of surface nanocrystallization on the oxide film formed on 316LN stainless steel in a high‐temperature aqueous environment

“…[3][4][5] It is well-known that the initiation and propagation of the localized corrosion problem are strongly related to the properties of the oxide films formed on the surface of the steel. [6] A considerable number of studies had devoted to the effects of temperature, pressure, alloy composition, and oxygen content on the thickness, structure, and composition of oxide film generated in a high-temperature and highpressure aqueous environment, [7][8][9] which showed that the growth of oxide film was mainly affected by the diffusion of Fe, Cr, Ni, and O ions through the oxide film. [10] Sun et al [11] investigated the effects of temperature on the oxide film properties of 304 SS in lithium borate buffer solution.…”

Corrosion Resistance of Stainless Steels Intended to Come into Direct or Prolonged Contact with the Skin

“…These stainless steels are relatively soft (typically HV 200) and have good resistance to generalized corrosion [21,22]. On the other hand, steels are sensitive to pitting and crevice corrosion, especially the 316L type [23,24]. For these reason, another alloy, X1 CrNiMo 18-15-4 N 0.15 (317LMN) was chosen as the subject of this study.…”