C-276 Hastelloy, as the king of corrosion resistance in contemporary metal materials, is a nickel-molybdenum-chromium-iron-tungsten nickel-based alloy. It is mainly resistant to wet chlorine, various reduced fluorides, chloride salt solutions, and shows good corrosion resistance to low and medium temperature sulfuric acid. This makes it widely used in harsh corrosive environments such as chemical, petrochemical, flue gas desulfurization, paper paddle, papermaking, and environmental protection. Alloy is one of the candidate materials for cladding parts, and its radiation resistance is to be studied in this paper. Protons and multi-beam particles were irradiated on the alloy, and the samples of the alloy before and after irradiation were studied by nanohardness tester, transmission electron microscope and Raman imager. The results show that under the irradiation of protons and multiple beams of particles, segregation and dislocation loop hardening occur in the irradiation damage areaUnder the condition of single beam irradiation, the relative intensity of the carbon peak in the Raman spectrum is larger and the carbon peak is redshifted at the smooth or smooth depth, resulting in higher nanohardness here than at other depthsThe depth of the damage peak obtained by the experiment is in good agreement with the simulation calculation.
The blind date grades of Hastelloy C-276 are Tinggang Alloy (China) and NC17DW of Francenr.2.4819, UNS N10276 in Germany and NIMO16CR15W in the United States. The various corrosion data for Hastelloy C-276 alloy are typical, but cannot be used as a specification, especially in unknown environments where materials must be experimentally selected. There is not enough CR in Hastelloy C-276 alloy to resist corrosion in strongly oxidizing environments, such as hot concentrated nitric acid. The alloy is mainly used in chemical process environments, especially in the case of mixed acids, such as the discharge pipe of flue gas desulfurization systems.
The supercritical water-cooled reactor was selected as the most promising candidate system worthy of research and development due to its special advantages in terms of economy, technical maturity and sustainability. Due to the fact that the outlet pressure of the reactor core is above the temperature, the zirconium alloy can no longer meet the requirements of its cladding material. Therefore, countries around the world have carried out research on other materials, mainly including steel, nickel-based alloys, chemical alloys, and austenitic stainless steels. Among them, nickel-based alloys are used as one of the candidate materials for supercritical water reactor cladding in China.
Hastelloy C-276 is a similar grade
The research on C276 at home and abroad mainly focuses on welding and corrosion resistance, and there are not many studies on mechanical properties and corresponding microstructures, and there are no reports on radiation resistance. Therefore, in this paper, the samples before and after the irradiation of protons and multi-beam particles were selected as samples, the nanohardness of protons and multi-beam particles was observed by nanohardness tester, and the Raman spectroscopy was used to measure them, and the irradiation hardening phenomenon of C276 alloy under protons and multi-beam particles was discussed.
Hastelloy C-276 chemical composition
Hastelloy C-276 Physical Properties
As a new material, Hastelloy exhibits excellent mechanical properties. It has the characteristics of high strength and high wear resistance, which makes it particularly difficult in the processing process. Hastelloy has a strong tendency to strain harden, and when the deformation rate reaches 15%, it is about twice as hard as conventional 18-8 stainless steel. At the same time, Hastelloy also has a medium-temperature sensitization zone, which means that it becomes sensitized within a certain temperature range. As the deformation rate increases, so does the sensitization tendency. Therefore, during the processing of Hastelloy, special attention should be paid to temperature control to prevent sensitization from adversely affecting its properties. In addition, there are some problems with Hastelloy when the temperature is higher. Since it easily absorbs harmful elements, its mechanical properties and corrosion resistance are reduced. Therefore, when using Hastelloy in a high-temperature environment, special treatment is required to ensure the stability of its material properties. Overall, Hastelloy is a material with excellent mechanical properties and stable performance in a variety of harsh environments. Continuous research and optimization of Hastelloy's properties will inevitably lead to wider applications in a wide range of industries.