Method for controlling residual ferrite and martensite slab structure in 9Cr-ODS steel

A lath structure and ferrite technology, applied in the direction of improving process efficiency, etc., to achieve the effect of improving creep life

Inactive Publication Date: 2017-06-13
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for 9Cr-ODS steel with a certain alloy composition, how to effectively control the residual ferrite in 9Cr-ODS steel through a simple heat treatment process has not been reported.

Method used

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  • Method for controlling residual ferrite and martensite slab structure in 9Cr-ODS steel
  • Method for controlling residual ferrite and martensite slab structure in 9Cr-ODS steel
  • Method for controlling residual ferrite and martensite slab structure in 9Cr-ODS steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The composition of the pre-alloyed powder in Example 1 is shown in the table. The composition is Fe-9Cr-1.5W-0.2V-0.07Ta-0.1C (wt.%). Combine the prealloyed powder with Y 2 O 3 The powder is mixed according to the mass ratio of 99.65:0.35, and mechanically ball milled in a planetary ball mill with a ball-to-material ratio of 15:1, a ball milling speed of 400r / min, and a ball milling time of 45h under argon protection; After adding an appropriate amount of ball mill powder, put it into a spark plasma sintering furnace for solidification and molding, raise the temperature to 800°C at a heating rate of 100°C / min, keep it for 5 minutes, then raise the temperature to 1100°C at the same rate, keep it for 10 minutes, and the sintering pressure is 40MP, cooled to room temperature with the furnace.

[0033] Subsequent heat treatment was carried out on the 9Cr-ODS martensitic steel obtained by sintering. The temperature was raised to 1100 °C at a heating rate of 10 °C / min, kept...

Embodiment 2

[0036] The composition of the pre-alloyed powder in Example 2 is shown in the table. The composition is Fe-9Cr-1.5W-0.2V-0.07Ta-0.1C (wt.%). Combine the prealloyed powder with Y 2 O 3 The powder is mixed according to the mass ratio of 99.65:0.35, and mechanically ball milled in a planetary ball mill with a ball-to-material ratio of 15:1, a ball milling speed of 400r / min, and a ball milling time of 45h under argon protection; After adding an appropriate amount of ball mill powder, put it into a spark plasma sintering furnace for solidification and molding, raise the temperature to 800°C at a heating rate of 100°C / min, keep it for 5 minutes, then raise the temperature to 1100°C at the same rate, keep it for 10 minutes, and the sintering pressure is 40MP, cooled to room temperature with the furnace.

[0037] Subsequent heat treatment was carried out on the 9Cr-ODS martensitic steel obtained by sintering. The temperature was raised to 1100 °C at a heating rate of 20 °C / min, kept...

Embodiment 3

[0040] The composition of the pre-alloyed powder in Example 3 is shown in the table. The composition is Fe-9Cr-1.5W-0.2V-0.07Ta-0.1C (wt.%). Combine the prealloyed powder with Y 2 O 3 The powder is mixed according to the mass ratio of 99.65:0.35, and mechanically ball milled in a planetary ball mill with a ball-to-material ratio of 15:1, a ball milling speed of 400r / min, and a ball milling time of 45h under argon protection; After adding an appropriate amount of ball mill powder, put it into a spark plasma sintering furnace for solidification and molding, raise the temperature to 800°C at a heating rate of 100°C / min, keep it for 5 minutes, then raise the temperature to 1100°C at the same rate, keep it for 10 minutes, and the sintering pressure is 40MP, cooled to room temperature with the furnace.

[0041] Subsequent heat treatment was carried out on the 9Cr-ODS martensitic steel obtained by sintering. The temperature was raised to 1100 °C at a heating rate of 30 °C / min, kept...

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Abstract

The present invention relates to a method for controlling residual ferrite and martensite slab structure in a 9Cr-ODS steel. The method comprises: mixing pre-alloyed powder and nano-scale Y2O3 according to a mass ratio of 99.65:0.35, wherein the pre-alloyed powder comprises, by mass, 1 part of Fe, 9 parts of Cr, 1.5 parts of W, 0.2 part of V, 0.07 part of Ta, and 0.1 part of C; carrying out mechanical ball milling in a ball mill, heating to a temperature of 800 DEG C by using discharging plasma sintering, carrying out thermal insulation for 5-10 min, continuously heating to a temperature of 1100 DEG C, and carrying out thermal insulation for 10-15 min to obtain a 9Cr-ODS martensite steel having a molding compactness of more than 99%; and carrying out heat treatment on the sintering-state 9Cr-ODS martensite steel, heating to a temperature of 1100 DEG C at a heating rate of 10-40 DEG C/min, carrying out thermal insulation, and cooling to a room temperature. According to the present invention, with the method, the content of the residual ferrite in the 9Cr-ODS martensite steel is effectively controlled, and the ultrafine nano-scale martensite slab can be obtained during the cooling process.

Description

technical field [0001] The invention belongs to the technical field of preparation of oxide dispersion strengthened martensitic steel, and relates to a preparation and heat treatment process for controlling residual ferrite content and martensitic strip width in oxide dispersion strengthened martensitic steel. Background technique [0002] The construction of nuclear power plants requires a large amount of high-quality steel and high-end nuclear-grade steel. Low activation martensitic / ferritic steel has become the main candidate structural material for fast neutron reactors and fusion reactors because of its low radiation swelling and thermal expansion coefficients, high thermal conductivity, and good resistance to liquid metal corrosion. It should be noted that such materials still have problems such as insufficient high temperature strength, low service temperature (<600°C), and helium brittleness. To further improve the service temperature and thermal efficiency of nu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C33/02C21D6/00C22C38/24C22C38/22C22C38/26B22F3/105B22F3/24
CPCB22F3/105B22F3/24B22F2003/1051B22F2003/248C21D6/002C21D2211/005C21D2211/008C22C33/0207C22C38/22C22C38/24C22C38/26Y02P10/20
Inventor 刘永长周晓胜余黎明李冲马宗青刘晨曦
Owner TIANJIN UNIV
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