High-temperature and corrosion resistant aluminum-containing austenitic stainless steel and preparation method
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A technology of austenitic stainless steel and high temperature corrosion resistance, which is applied in the field of materials to achieve the effects of good plasticity and strength, stable corrosion resistance and good mechanical behavior
Inactive Publication Date: 2021-07-23
NUCLEAR POWER INSTITUTE OF CHINA
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[0005] However, for supercritical fluid medium reactors, there is a more destructive corrosive environment inside, so the corrosion resistance of materials is required to be better, and the current materials cannot meet the above requirements well.
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Embodiment 1
[0035] The present invention is an aluminum-containing austenitic stainless steel resistant to high temperature corrosion, comprising the following components in weight percentage: Ni: 25%, Cr: 18%, Al: 3%, Mo: 2%, Si: 0.3%, Nb: 0.6 %, C: 0.02%, Y: 0.2%, and the balance is Fe.
[0036] The preparation process is as follows:
[0037] 1) Vacuum smelting is used to prepare ingots;
[0038] 2) Homogenization treatment: raise the temperature of the sample to 1200°C with the furnace, and keep it warm for 2 hours;
[0039] 3) The ingot is forged at 1250°C, the forging ratio is 3:1, and the thickness of the sample after forging is 20mm;
[0040] 4) Solid solution treatment: heat up to 1250°C with the furnace in the heat treatment furnace, keep it warm for 1 hour, and immediately water quench;
[0041] 5) Cut the sample after solid solution, and then carry out anti-oxidation and basic mechanical properties experiments.
[0042] figure 1 This is the phase diagram of the alloy mater...
Embodiment 2
[0047] The present invention is an aluminum-containing austenitic stainless steel resistant to high temperature corrosion, comprising the following components in weight percentage: Ni: 25%, Cr: 18%, Al: 2.5%, Mo: 2%, Si: 0.3%, Nb: 0.6 %, C: 0.02%, Y: 0.2%, and the balance is Fe.
[0048] The preparation process is as follows:
[0049] 1) Vacuum smelting is used to prepare ingots;
[0050] 2) Homogenization treatment: raise the temperature of the sample to 1200°C with the furnace, and keep it warm for 2 hours;
[0051] 3) Forging the ingot at 1250°C, the forging ratio is 3:1, and the thickness of the sample after forging is 20mm; hot rolling: three times, the total reduction is 60%;
[0052] 4) Solid solution treatment: heat up to 1200°C for 0.5-2 hours, then water quench immediately;
[0053] 5) Cut the sample, and then carry out the basic mechanical property experiment.
[0054] Wherein, the rolling process of step 3) is as follows table 1:
[0055] Table 1 rolling proce...
Embodiment 3
[0058] The difference between this embodiment and embodiment 2 is that the Al content is 3.5%.
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Abstract
The invention discloses high-temperature and corrosion resistant aluminum-containing austenitic stainless steel and a preparation method. The high-temperature and corrosion resistant aluminum-containing austenitic stainless steel comprises, by weight, 15%-30% of Ni, 15%-25% of Cr, 2.5%-8% of Al, 1%-3% of Mo, 0.1%-1% of Si, 0.1%-2% of Nb, 0.02%-0.2% of C, 0.02%-0.2% of Y/Hf and the balance Fe. According to the aluminum-containing austenitic stainless steel, the content of Cr is increased to 15-25 wt.%, the content of Al is increased to 2.5-8 wt.%, the aluminum-containing austenitic stainless steel contains Cr and Al elements with the enough high content, both Cr and Al are key elements for improving the oxidation resistance, and the high content of Cr and Al contributes to formation of an Al-Cr oxidation film. A stable and compact Cr2O3 oxidation film can be formed on the surface of the alloy, and the oxidation resistance of the material is improved; and meanwhile, the Al2O3 oxidation film can be formed on the surface of the alloy in an oxidizing atmosphere, the Al2O3 layer is good in thermodynamic stability, low in growth rate and more protective in an extreme environment, and the Al can further form a large number of B2-NiAl phases in a matrix. The using temperature of the material in a high-temperature oxidizing atmosphere is increased, the corrosion resistance of the material is improved, and the material can be used in a high-temperature extreme environment.
Description
technical field [0001] The invention relates to the field of materials, in particular to an aluminum-containing austenitic stainless steel resistant to high temperature corrosion and a preparation method thereof. Background technique [0002] Supercritical reactors use supercritical fluid as the cooling medium, use the sudden change of physical properties in the quasi-critical region, reduce compression power consumption, and achieve the goal of achieving higher efficiency at medium core outlet temperatures for gas-cooled reactors, and gradually become the fourth generation of advanced reactor research. hotspot. Compared with system design, the corrosion resistance and high-temperature mechanical behavior of key components in supercritical circulation systems, such as turbines, heat exchangers, pipelines and other structural materials, will be important factors that determine system safety and component life. [0003] Aluminum-containing austenitic stainless steel (Alumina-...
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