Method for heat treatment of low-activation steel

A low-activation steel and normalizing technology, applied in the field of low-activation steel, can solve the problems of material strength and toughness decline, lath roughening, and hindering the migration of tempered martensite lath boundaries.

Inactive Publication Date: 2021-11-02
TSINGHUA UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] 9% Cr low-activation steel belongs to the category of martensitic heat-resistant steel. Its strength is high, and its tensile strength is about 700-800MPa. However, its toughness is low, and its toughness is about 160J before service. Dislocations and fine precipitated phase particles can hinder the boundary migration of tempered martensite laths, ensuring good service performance of the material
However, with increasing service time, M...

Method used

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  • Method for heat treatment of low-activation steel
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  • Method for heat treatment of low-activation steel

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Experimental program
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Effect test

Embodiment 1

[0052] The composition of the low-activation steel is shown in Table 1. After the low-activation steel was kept in a furnace at 1000°C for 30 minutes, it was water-cooled to room temperature (cooling rate was 40°C / s); After 10 minutes of internal heat preservation, water cooling to room temperature (cooling rate of 40°C / s); and finally tempering at 760°C for 90 minutes, air cooling to room temperature (cooling rate of 7°C / s).

Embodiment 2

[0054] The composition of the low-activation steel is shown in Table 1. After the low-activation steel was kept in a furnace at 1020°C for 40 minutes, it was water-cooled to room temperature (cooling rate was 40°C / s); then the low-activation steel was placed in a furnace heated to 1000°C After 10 minutes of internal heat preservation, water cooling to room temperature (cooling rate of 40°C / s); finally tempering at 760°C for 100 minutes, air cooling to room temperature (cooling rate of 7°C / s).

Embodiment 3

[0056] The composition of the low-activation steel is shown in Table 1. After the low-activation steel was kept in a furnace at 1030°C for 50 minutes, it was water-cooled to room temperature (cooling rate was 40°C / s); then the low-activation steel was placed in a furnace heated to 1020°C After 10 minutes of internal heat preservation, water cooling to room temperature (cooling rate of 40°C / s); finally, after tempering at 770°C for 100 minutes, air cooling to room temperature (cooling rate of 7°C / s).

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Abstract

The invention discloses a method for heat treatment of low-activation steel. The method comprises the following steps: (1) performing primary normalizing treatment on the low-activation steel, and then carrying out cooling; (2) performing secondary normalizing treatment on a cooled sample obtained in the step (1), and then carrying out cooling; and (3) performing tempering treatment on a cooled sample obtained in the step (2), and then carrying out cooling. Therefore, by adopting the method, uniform and fine original austenite grains and tempered martensite lath structures can be obtained, so that when the low-activation steel is subjected to impact stress, the stress is dispersed on a plurality of grains, the plastic deformation is relatively uniform, the stress concentration is relatively small, the grain boundaries generated by the fine grain structures are relatively large, cracks are not easy to expand, and the toughness of the low-activation steel can be improved. In addition, the method can be further applied to performance optimization of the low-activation steel and production of structural materials of commercial fusion power stations.

Description

technical field [0001] The invention belongs to the technical field of low-activation steel, and in particular relates to a method for heat-treating low-activation steel. Background technique [0002] As an important part of my country's strategic emerging industries, nuclear energy has the advantages of high energy density, low-carbon cleanliness, and stability. It is an important pillar of energy supply among non-fossil energy sources, and it is also an important means of smog control and energy security. my country has adjusted the policy of "moderately developing nuclear power" to "actively developing nuclear power", which is of great significance to solving the energy shortage crisis and environmental pollution problems that our country is currently facing. Nuclear energy includes fusion energy and fission energy. In view of the limitations of the small amount of nuclear fuel required for fission energy and the difficult-to-handle radioactive waste generated by fission...

Claims

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Application Information

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IPC IPC(8): C21D1/18C21D1/28C21D6/00C22C38/02C22C38/04C22C38/06C22C38/22C22C38/24C22C38/26C22C38/44C22C38/46C22C38/48
CPCC21D1/28C21D1/18C21D6/002C21D6/005C21D6/008C21D6/004C22C38/02C22C38/04C22C38/22C22C38/001C22C38/24C22C38/26C22C38/06C22C38/46C22C38/48C22C38/44C21D2211/001C21D2211/008
Inventor 张弛刘震霍晓杰杨志刚陈浩
Owner TSINGHUA UNIV
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