| Application: | Industrial |
|---|---|
| Standard: | GB, ASTM |
| Purity: | >99.5% |
| Alloy: | Alloy |
| Powder: | Not Powder |
| Transport Package: | Wooden |
| Customization: |
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Audited Supplier Hastelloy N alloy is a nickel-based superalloy material for molten salt reactors. It has the advantages of excellent corrosion resistance, neutron irradiation resistance and good high temperature mechanical properties. However, the reactor outlet temperature reached 750°C, which exceeded the allowable temperature of Hastelloy N alloy of 704°C, that is, the alloy could not be used stably in a 750°C molten salt environment for a long time. Therefore, it is urgent to optimize the Hastelloy N alloy to meet the requirements of higher temperature molten salt reactors.
Since Mn element has the advantages of stable austenite and improved oxidation resistance in superalloys, this paper takes Hastelloy N alloy as the research goal, by planning and preparing Hastelloy N alloys with different Mn contents, and using optical microscopy (OM), scanning Electron microscopy (SEM+EDS+EBSD), universal tensile machine, X-ray diffractometer (XRD) and electron probe (EPMA) were used to study the effect of Mn content on the microstructure, mechanical properties and oxidation properties of HastelloyN alloy. . The following research results were obtained:
(1) The addition of Mn element can promote the grain refinement of Hastelly N alloy, and the number of carbides is added, and the carbides gradually condense into blocks, long chains, and aggregate at the grain boundaries.
(2) When stretched at room temperature, the tensile strength of 0.5Mn alloy is poor. When the Mn content exceeds 1wt%, the tensile strength is improved, and the fracture has dimples and stepped grain structure. The cracking method is composed of cleavage cracking and resistance cracking. of mixed cracking. When stretched at 850ºC, Mn has no obvious effect on the tensile strength of the alloy, and a lubricated crystal plane appears in the fracture. The cracking method is intergranular brittle cracking.
(3) With the addition of Mn content, the oxidation resistance of the alloy is improved. At 700ºC, the oxidation resistance of the alloy with 1wt% Mn content is the best, and the oxidation rate is 25.9% lower than that of the 0Mn alloy. At 850ºC, the oxidation resistance of the alloy with 0.75wt%Mn content is the best, and the oxidation rate is 52.1% lower than that of the 0Mn alloy.
(4) The oxide film has a layered structure. After oxidation at 700°C/200h, all alloy oxide films are divided into two layers. The outer layer is oxides such as NiO and Fe2O3, and the inner layer is oxides such as Cr2O3, MoOz and NiMn2O4. There is no obvious drop, and the NiO layer is intact and dense. With the addition of Mn content, the oxide layer of the alloy gradually becomes thinner. After oxidation at 850ºC/100h, the Mn content of the alloy is 0~0.2wt%. The oxide film is divided into three layers. The outer layer is mainly NiO, the middle layer is NiO, NiMn2O4 and other composite oxides, and the inner layer is Cr2O3, MoO2 and other oxides In the alloy with Mn content of 0~0.2wt%, the oxide film is divided into two layers, the outer layer is NiO and a small amount of NiFeO4, NiMn2O4, and the inner layer is oxides such as Cr2O3 and MoO2. With the addition of Mn content, the internal oxidation of the alloy is gradually weakened.
(5) The addition of Mn can promote the formation of a NiMn2O4 spinel protective layer between NiO and the matrix, which effectively prevents the intrusion of external ○ and the outward diffusion of alloying elements, and improves the oxidation resistance of the alloy.
Hastelloy N has excellent resistance to oxidation by thermal fluoride salts at 704-871°C and excellent resistance to oxidation in air. It has good resistance to aging and embrittlement, and has good processing performance at the same time.
Use: Molten Fluoride Salt Container
hastelloy s alloy
hastelloy s (n10003)
Specification number:
Specifications Bars Forgings Sheets and Strips Wires Tubes
ASTM b573 astm b573 astm b434 - -
American Aerospace Material Specifications - - - - -
American Machinery --- Association asme sb573 asme sb573 asme sb434 - -
1. Chemical composition (wt%):
c cr ni co w mo al+ti fe v b si mn p s cu
0.04~0.08 6.0~8.0 Margin ≤0.20 ≤0.5 15.0~18.0 ≤ 0.5 ≤5.0 ≤ 0.5 ≤ 0.01 ≤ 1.0 ≤ 1.0 ≤ 0.015 ≤ 0.02 ≤0.35
2. Physical function:
Density (g/cm3) 8.86
Melting point (ºC) 1300-1400
Resistivity uω·m 1.2020ºC
Linear expansion coefficient (°c-1)(21-204°c) 1.26705ºC
Thermal conductivity (w/(m?k)) 1.24815ºC
Specific heat capacity j/kg?ºC 11.6x10-6 11.5 419
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