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Preparation technique for high-strength and high-plasticity ultra-fine grain low-activity ferrite/martensite steel

A low-activation ferrite and martensitic steel technology, applied in the field of low-activation ferrite/martensitic steel, can solve the problems of plastic deterioration of ultra-fine grain materials, achieve high strength, eliminate dislocation accumulation, The effect of improving strength and plasticity

Inactive Publication Date: 2016-11-23
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a method for preparing large-sized block ultrafine-grained low-activation ferrite / martensitic steel, which utilizes the method of combining rotary forging deformation and annealing treatment, through grain size and carbide refinement, and improve the uniform distribution of carbides, while improving the strength and plasticity of low-activation ferrite / martensitic steel, overcoming the shortcomings of plastic deterioration of ultra-fine-grained materials

Method used

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  • Preparation technique for high-strength and high-plasticity ultra-fine grain low-activity ferrite/martensite steel
  • Preparation technique for high-strength and high-plasticity ultra-fine grain low-activity ferrite/martensite steel
  • Preparation technique for high-strength and high-plasticity ultra-fine grain low-activity ferrite/martensite steel

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Embodiment 1

[0023] Using industrial pure iron, metal chromium, tungsten, vanadium, titanium and manganese as raw materials, the chemical composition of the alloy prepared according to the mass fraction (wt.%) is: C: 0.11%, Cr: 8.86%, W: 1.62%, V: 0.24%, Ta: 0.11%, Mn: 0.45%, Si: 0.05%, and the balance is an alloy of Fe.

[0024] The specific production process steps are as follows:

[0025] 1) Melting: Put the prepared raw materials into a CaO crucible, melt them in a vacuum induction furnace, and cast them into ingots. After the ingots are completely solidified, open the mold and take them out;

[0026] 2) Solution treatment: heat the ingot to 1100°C for solution treatment, and keep it warm for 2 hours;

[0027] 3) Forging: quickly place the sample in step 2) on a hammer forging machine for forging, then air-cool to room temperature, the blank forging temperature is about 1050°C, and the final forging temperature is above 900°C; Finally forged into a 30mm thick plate;

[0028] 4) Heat...

Embodiment 2

[0033] Using industrial pure iron, metal chromium, tungsten, vanadium, titanium and manganese as raw materials, the chemical composition of the alloy prepared according to the mass fraction (wt.%) is: C: 0.12%, Cr: 8.79%, W: 1.78%, V: 0.24%, Ta: 0.09%, Mn: 0.52%, Si: 0.22%, and the balance is an alloy of Fe.

[0034] The specific production process steps are as follows:

[0035] 1) Melting: Put the prepared raw materials into a CaO crucible, melt them in a vacuum induction furnace, and cast them into ingots. After the ingots are completely solidified, open the mold and take them out;

[0036] 2) Solution treatment: heat the ingot to 1100°C for solution treatment, and keep it warm for 2 hours;

[0037] 3) Forging: quickly place the sample in step 2) on a hammer forging machine for forging, then air-cool to room temperature, the blank forging temperature is about 1050°C, and the final forging temperature is above 900°C; Finally forged into a 32mm thick plate;

[0038] 4) Heat...

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Abstract

The invention discloses a preparation technique for high-strength and high-plasticity ultra-fine grain low-activity ferrite / martensite steel and belongs to the field of low-activity ferrite / martensite steel. According to the preparation technique, a rotary forging and pressing deformation technique is introduced, so that the purposes of refining the sizes of grains and the size of carbide and improving the distribution uniformity of the carbide are achieved; and then dislocation pileup caused by deformation is eliminated through annealing treatment, and preparation of the high-strength and high-plasticity low-activity ferrite / martensite steel is achieved. According to the technique, the strength of the material is improved by means of the dispersion strengthening effect of the ultra-fine grains and the tiny carbide, and the plasticity of the material is improved by means of strain hardening capacity improvement caused by uniform distribution of the carbide. The strength and plasticity of the ultra-fine grain low-activity ferrite / martensite steel are remarkably improved, and novel high-strength and high-plasticity low-activity ferrite / martensite steel can be prepared for the nuclear power industry.

Description

Technical field: [0001] The invention relates to the field of low-activation ferrite / martensitic steel, in particular to a preparation process of high-strength plastic ultra-fine grain low-activated ferrite / martensitic steel. Background technique: [0002] Low-activation ferritic / martensitic steels have excellent thermophysical properties and a mature technical foundation, and are generally considered to be the main candidate materials for future nuclear reactor construction. Since the service environment of low-activation ferritic / martensitic steel is a strong radiation environment, long-term irradiation will cause embrittlement of ferritic / martensitic steel, thus affecting the mechanical properties and fracture behavior of the steel. Recent studies have found that, compared with traditional coarse-grained materials, nano and submicron materials have better radiation resistance, and show good application prospects in the nuclear power industry. [0003] At present, dense b...

Claims

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Application Information

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IPC IPC(8): C21D8/00C22C38/26
Inventor 陈胜虎戎利建闫德胜姜海昌王本贤
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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