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.
Highlights
316L stainless steel (316L SS) is widely used as a structural material in nuclear power plants due to its excellent mechanical properties, such as ductility, formability, toughness, and weldability, and its adequate irradiation and corrosion resistance [1,2,3]
The stress–strain curves of the 316LN stainless steel tested at the conditions of 0.001 mm/min tensile rate, 0.0005 mm/min tensile rate, different temperature, and different prefilm time are shown tensile rate, 0.0005 mm/min tensile rate, different temperature, and different prefilm time are shown in Figure 2a–d, respectively
The effect of the strain rate, experimental temperature, Zn content in the test solution, prefilming time on the tensile properties was investigated by a tensile test with a slow strain rate, and prefilming time on the tensile properties was investigated by a tensile test with a slow strain with a chemical solution of 2.2 ppm Li and 1200 ppm B in a static autoclave at 8.2 MPa
Summary
316L stainless steel (316L SS) is widely used as a structural material in nuclear power plants due to its excellent mechanical properties, such as ductility, formability, toughness, and weldability, and its adequate irradiation and corrosion resistance [1,2,3]. (1) Microstructure analysis of the surface oxide film [5,17]; (2) investigation of the kinetic and transport behaviors of surface oxidation [12]; (3) the zinc effect under different experimental conditions, including different water chemistry and loading conditions [3,18], nitrogen environments [19], irradiation [20], strain rates [21], and pH values [22]; (4) the Zn effect on the mechanical properties, such as stress corrosion crack growth rates [3]; and (5) the synergistic effect of the zinc with other injected ions on oxide films, such as aluminum [23]. The surface morphology, fractograph, and cross-sectional microstructure after the SSRT test were observed and analyzed in detail by scanning electron microscopy (SEM) and transmission electron microscopy (TEM), in order to understand the corresponding mechanisms
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