Low activation martensitic steel with resistance to high temperature oxidation and high strength
A high-temperature oxidation-resistant, martensitic steel technology, applied in the field of martensitic steel, can solve the problems of weak high-temperature oxidation resistance, strength and impact toughness, etc., achieve high high-temperature oxidation resistance and improve high-temperature oxidation resistance , high-strength effect
Active Publication Date: 2013-09-18
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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[0004] The purpose of the present invention is to provide a low-activation martensitic steel with high-temperature oxidation resistance, high strength and good toughness, so as to solve the problem of weak high-temperature oxidation resistance and insufficient strength and impact toughness in the existing low-activation martensitic steel. Balance and other issues
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[0029] The alloy is smelted in a vacuum induction furnace, and the content of impurity elements such as S and P is strictly controlled. The chemical composition is shown in Table 1. After removing the riser of the casting, start forging at 1100±10°C, and the final forging temperature is 900±10°C. After forging, it is rolled at 1100°C for 2 hours, and the rolling deformation is about 66%. The heat treatment process is 980°C-1040°C (1000°C in this example) for 45 minutes, water cooling to room temperature, and then air cooling to room temperature after holding at 750°C for 2 hours. After heat treatment, the tempered microstructure of the steel is as follows: figure 1 As shown, it can be seen from the figure that the organization is martensitic lath, and no high temperature δ ferrite remains. Table 2 shows the room temperature mechanical properties of low-activation martensitic steel before and after adding Al, Si, and C. The results show that by adding an appropriate amount of...
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The invention relates to low activation martensitic steel with resistance to high temperature oxidation and high strength. The steel comprises the chemical components in percentage by weight: 0.15-0.25% of C, 8.0-12.0% of Cr, 1.2-2.2% of W, 0.2-0.3% of V, 0.1-0.2% of Ta, 0.1-0.3% of Al, 0.3-0.8% of Si, 0.3-0.7% of Mn, less than or equal to 0.01% of P, less than or equal to 0.005% of S and the balance of Fe and inevitable impure elements. According to steel provided by the invention, based on 9Cr2WVTa low activation martensitic steel, appropriate amount of Al and Si elements is added, and the content of C is reasonably controlled, and the compactness of an oxidation film and the adhesion of a base body for the martensitic steel are improved under the comprehensive effect of Al, Si and Cr, so that the base body is prevented from being further oxidized, and the resistance to high temperature oxidation of the material is improved. Meanwhile, the content of C is adjusted to improve the strength of the material, and the higher impact toughness is maintained. The low activation martensitic steel provided by the invention not only has good resistance to high temperature oxidation, but also has excellent comprehensive mechanical property.
Description
Technical field: [0001] The invention relates to the field of martensitic steel, in particular to a high-temperature oxidation-resistant, high-strength low-activation martensitic steel. Background technique: [0002] Low activation martensitic steel is often used as the target structure material of spallation neutron source. The spallation neutron source system is an important part of the accelerator-driven subcritical (ADS) system. In the ADS system, structural materials are used for beam windows and target materials, and will be irradiated by high-energy, high-intensity protons or neutrons. Therefore, low-activation steel should be selected, that is, high-activity elements in steel such as Mo, Nb and Ni. Low activation elements W, Ta, V, etc. to replace. In addition, this material will be used in a high temperature state for a long time, with a temperature of 300-600°C or even higher. Therefore, materials with excellent high temperature oxidation resistance are required...
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IPC IPC(8): C22C38/26C21D8/00
Inventor 宋元元戎利建闫德胜鲁艳红
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI