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Precipitation strengthened heat resistant steel and preparation process thereof

A technology of precipitation strengthening and preparation technology, which is applied in the field of metal materials, can solve problems such as the decrease of alloy plasticity, the influence of alloy performance, and the rapid increase of alloy ductile-brittle transition temperature, so as to achieve the effect of reducing the transition temperature

Active Publication Date: 2018-01-16
CHINA HUANENG GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, when the degree of alloying is high, it will often cause the formation of high-temperature ferrite, and at the same time increase the ductile-brittle transition temperature of the alloy, resulting in a sharp decrease in the plasticity of the alloy, which has a serious impact on the performance of the alloy.
According to the current research results, the addition of Al element has a significant effect on the plasticity of the alloy, and the addition of a small amount of Al element will cause the ductile-brittle transition temperature of the alloy to increase rapidly.

Method used

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  • Precipitation strengthened heat resistant steel and preparation process thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The heat-resistant steel material of this embodiment comprises: C: 0.05%, Ni: 6%, Cr: 8.5%, Al: 2%, Co: 3%, Nb: 0.06%, Zr: 0.05%, The balance is Fe.

[0025] The preparation method of the present embodiment comprises the following steps:

[0026] 1) Raw material preparation: the ingredients include by mass percentage: C: 0.05%, Ni: 6%, Cr: 8.5%, Al: 2%, Co: 3%, Nb: 0.06%, Zr: 0.05%, and the balance is Fe.

[0027] 2) Melting step: use a vacuum induction furnace at a vacuum degree not higher than 5×10 -3 The prepared alloy is smelted into an alloy mother liquor under MPa, and finally an alloy ingot is prepared by a negative pressure casting process.

[0028] 3) High-temperature hot rolling: the alloy ingot is rolled at 1050°C to form a plate. During rolling, the rolling deformation of each pass is not less than 30%, and the final total deformation is not less than 70%.

[0029] 4) Alloy heat treatment: The rolled plate was solution treated at 1050°C for 2 hours, then...

Embodiment 2

[0031] The heat-resistant steel material in this embodiment includes: C: 0.05%, Ni: 6%, Cr: 8.5%, Al: 2%, Nb: 0.06%, Zr: 0.05%, and the balance is Fe.

[0032] The preparation method of the present embodiment comprises the following steps:

[0033] 1) Raw material preparation: the ingredients include by mass percentage: C: 0.05%, Ni: 6%, Cr: 8.5%, Al: 2%, Nb: 0.06%, Zr: 0.05%, and the balance is Fe.

[0034] 2) Melting step: use a vacuum induction furnace at a vacuum degree not higher than 5×10 -3 The prepared alloy is smelted into an alloy mother liquor under MPa, and finally an alloy ingot is prepared by a negative pressure casting process.

[0035] 3) High-temperature hot rolling: the alloy ingot is rolled at 1050°C to form a plate. During rolling, the rolling deformation of each pass is not less than 30%, and the final total deformation is not less than 70%.

[0036] 4) Alloy heat treatment: The rolled plate was solution treated at 1050°C for 2 hours, then air-cooled, th...

Embodiment 3

[0038] The heat-resistant steel material of this embodiment includes: C: 0.05%, Ni: 6%, Cr: 11%, Al: 2%, Co: 3%, Nb: 0.06%, Zr: 0.05%, The balance is Fe.

[0039] The preparation method of the present embodiment comprises the following steps:

[0040] 1) Raw material preparation: The ingredients include by mass percentage: C: 0.05%, Ni: 6%, Cr: 11%, Al: 2%, Co: 3%, Nb: 0.06%, Zr: 0.05%, and the balance is Fe.

[0041] 2) Melting step: use a vacuum induction furnace at a vacuum degree not higher than 5×10 -3 The prepared alloy is smelted into an alloy mother liquor under MPa, and finally an alloy ingot is prepared by a negative pressure casting process.

[0042] 3) High-temperature hot rolling: the alloy ingot is rolled at 1050°C to form a plate. During rolling, the rolling deformation of each pass is not less than 30%, and the final total deformation is not less than 70%.

[0043] 4) Alloy heat treatment: The rolled plate was solution treated at 1050°C for 2 hours, then ai...

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Abstract

The invention relates to precipitation strengthened heat resistant steel and a preparation process of the precipitation strengthened heat resistant steel. The components of an alloy meet the followingrange requirements by mass percent: 003-0.06% of C, 6-10% of Ni, 8-13% of Cr, 1.5-2.4% of Al, less than or equal to 3% of Co, less than or equal to 0.1% of Nb, less than or equal to 0.1% of Zr, and the balance of Fe; the prepared alloy is smelted into an alloy mother liquid and is finally prepared into an alloy ingot; the alloy ingot is rolled into a sheet at the temperature range of 850-1100 DEGC; and the rolled sheet is subjected to solid solution treatment and aging treatment to obtain the precipitation strengthened heat resistant steel. The heat resistant steel is excellent in room temperature toughness and has an excellent strength property at the same time. The room temperature tensile strength of the alloy is not lower than 1000 MPa, the yield strength exceeds 900 MPa, the room temperature elongation percentage is higher than 12%, and the reduction of area is higher than 50%.

Description

technical field [0001] The invention belongs to the field of metal materials, and in particular relates to a precipitation-strengthened heat-resistant steel and a preparation process thereof. Background technique [0002] High chromium martensitic heat-resistant steel has been widely used because of its low cost and excellent performance. The high chromium content ensures that the alloy has good oxidation resistance and corrosion resistance, which further ensures the performance of the alloy under severe working conditions. In order to further improve the mechanical properties of the alloy, recent studies have attempted to add Ni and Al elements to the alloy to promote the formation of finely dispersed NiAl phases in the alloy, so that the alloy can obtain better mechanical properties. However, when the degree of alloying is high, it will often cause the formation of high-temperature ferrite, and at the same time increase the ductile-brittle transition temperature of the al...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/48C22C38/50C22C38/52C22C38/06C22C33/04B21C37/02
Inventor 严靖博袁勇李浩赵新宝鲁金涛杨征张醒兴
Owner CHINA HUANENG GRP CO LTD
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