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High-strength RAFM steel and novel heat treatment process thereof

A high-strength, heat-treating technology, applied in the field of metal materials, can solve problems such as inability to meet requirements and harsh service environments

Active Publication Date: 2021-10-22
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with the harsh service environment of the fourth-generation reactor, this performance still cannot meet the requirements, so it is urgent to improve the room temperature strength and high temperature strength of RAFM steel to meet the harsh service environment

Method used

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  • High-strength RAFM steel and novel heat treatment process thereof
  • High-strength RAFM steel and novel heat treatment process thereof
  • High-strength RAFM steel and novel heat treatment process thereof

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Experimental program
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Effect test

Embodiment

[0021] (1) Qualified RAFM steel is prepared by adopting the composition of the present invention, the mass percent of alloying elements of the RAFM steel is: 0.128%C, 8.99%Cr, 1.89%W, 0.23%V, 0.169%Ta, 0.50%Mn , 0.22% Si, 0.04% N, 0.01% Zr, 0.03% RE, O<0.004%, P<0.004%, S<0.004%, and the balance is matrix Fe.

[0022] (2) The raw materials of the above components are cast by vacuum induction melting, and the raw materials are added in sequence according to the burning loss and volatilization characteristics of alloy elements. After the raw materials are vacuum induction smelted, ingots with qualified components are prepared.

[0023] (3) Homogenize the ingot at 1100°C for 3 hours, and then forge it with a forging ratio of about 5.

[0024] (4) First heat the cast ingot obtained in step (3) at 1150°C for 2 hours, carry out austenitization and then carry out rolling treatment. The initial rolling temperature is 1100°C, the end rolling temperature is 900°C, and the total deformat...

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Abstract

The invention provides novel RAFM steel and a heat treatment process thereof. The RAFM steel comprises, by mass percent, 0.10% < = C < = 0.13%, 8.50% < = Cr < = 9.00%, 1.80% < = W < = 2.00%, 0.20% < = V < = 0.25%, 0.15% < = Ta < = 0.20%, 0.01% < = Zr < = 0.02%, 0.45% < = Mn < = 0.50%, 0.2% < = Si < = 0.4%, 0.02% < = N < = 0.04%, RE (rare earth element) < = 0.03%, O < 0.004%, P < 0.004%, S < 0.004% and the balance Fe. The heat treatment process of the RAFM steel comprises the steps that heat preservation is conducted for 60 min in a 985 + / -5 DEG C high-temperature furnace, then the RAFM steel is rapidly put into a 275 + / -1 DEG C salt bath pan to be subjected to heat preservation for 60 s, then the RAFM steel is rapidly put into a 500 + / -5 DEG C high-temperature furnace to be subjected to heat preservation for 25 min, and then the RAFM steel is air-cooled to the room temperature after being discharged out of the furnace. The novel RAFM steel is combined with the heat treatment process of the novel RAFM steel so that higher strength can be obtained while plasticity is not obviously reduced.

Description

technical field [0001] The invention belongs to the field of metal materials, and in particular relates to a composition-optimized high-strength RAFM steel and a novel heat treatment process thereof, which is a process method for effectively improving the room temperature and high temperature strength of the RAFM steel. Background technique [0002] The current worldwide demand for energy is increasing, which promotes nuclear energy as one of the main energy sources in the future. The economic reliability of nuclear energy has been well documented in currently operating reactors. The Fourth Generation International Advanced Nuclear Energy Forum proposed six advanced reactor types. These advanced nuclear energy systems have higher safety, economy and environmental friendliness. Generation IV reactors have higher operating temperatures and higher neutron doses compared to operating commercial nuclear reactors, which pose major challenges in material selection, such as the nee...

Claims

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Application Information

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IPC IPC(8): C22C38/22C22C38/24C22C38/26C22C38/28C22C38/04C22C38/02C21D1/18C21D8/02
CPCC22C38/22C22C38/24C22C38/26C22C38/28C22C38/04C22C38/02C22C38/001C22C38/005C21D1/18C21D8/0226C21D8/0263C21D2211/008C21D2211/001C21D2211/005C21D2211/004
Inventor 黄雪飞王辉何豪黄维刚
Owner SICHUAN UNIV
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