阅读说明：本技术 低膨胀高温合金及其制备方法 (Low expansion superalloy and preparation method thereof ) 是由 陈琦 周扬 张健 付建辉 于 2019-10-10 设计创作，主要内容包括：本发明公开了一种低膨胀高温合金及其制备方法,属于冶金生产工艺制造技术领域。提供一种高温物理性能优良、Cr含量适中的低膨胀高温合金及其制备方法。所述的低膨胀高温合金为包含有下述重量份组分的冶炼均匀化热处理锻件,所述的重量份组分为35～40％的Ni,13～15％的Co,1.5～1.8％的Ti,4.5～5.2％的Nb+Ta,0.2-0.5％的Cr,0.1～0.3％的Mo,0.2-0.4％的Si,C：≤0.06％,其余为Fe和不可避免的杂质,所述冶炼均匀化热处理锻件在650℃/510MPa下的持久寿命＞100h。所述的制备方法采用纯合金元素Ni、Co、Cr、Mo、Nb、Ti、Si以及C在真空感应炉+真空自耗炉中先后进行的双联工艺熔炼、铸锭、均匀化处理以及热处理几个步骤。(The invention discloses a kind of low expansion superalloys and preparation method thereof, belong to metallurgical production process manufacturing technology field.The low expansion superalloy and preparation method thereof that a kind of high-temperature physical property is excellent, Cr content is moderate is provided.The low expansion superalloy is the smelting homogenization heat treatment forging for including following weight parts component, the Ni that the parts by weight of component is 35~40%, 13~15% Co, 1.5~1.8% Ti, 4.5~5.2% Nb+Ta, the Cr of 0.2-0.5%, the Si of 0.1~0.3% Mo, 0.2-0.4%, C :≤0.06%, remaining is Fe and inevitable impurity, the creep rupture life > 100h for smelting homogenization heat treatment forging at 650 DEG C/510MPa.The melting of duplex technique, ingot casting, Homogenization Treatments and the several steps of heat treatment that the preparation method is successively carried out in vaccum sensitive stove+consumable electrode vacuum furnace using homozygosis gold element Ni, Co, Cr, Mo, Nb, Ti, Si and C.)

1. a kind of low expansion superalloy, it is characterised in that: the low expansion superalloy be include following weight parts group The smelting homogenization heat treatment forging divided,

The Ni, 13~15% Co, 1.5~1.8% Ti, 4.5~5.2% Nb that the parts by weight of component is 35~40% The Cr of+Ta, 0.2-0.5%, the Si of 0.1~0.3% Mo, 0.2-0.4%, C :≤0.06%, remaining is for Fe and unavoidably Impurity,

The creep rupture life > 100h for smelting homogenization heat treatment forging at 650 DEG C/510MPa.

2. low expansion superalloy according to claim 1, it is characterised in that: in above-mentioned parts by weight of component, Ni+Co Total content be 50%~52%.

3. low expansion superalloy according to claim 1 or 2, it is characterised in that: can not be kept away in above-mentioned parts by weight of component The impurity exempted from includes O, S and P, and content is respectively O≤0.01%, S≤0.015%, P≤0.015%.

4. a kind of preparation method for low expansion superalloy described in claim 3, it is characterised in that: the preparation method The duplex technique melting that is successively carried out in vaccum sensitive stove+consumable electrode vacuum furnace using homozygous gold element, ingot casting, Homogenization Treatments And the several steps of heat treatment,

When wherein homozygous gold element successively carries out duplex technique melting in vaccum sensitive stove+consumable electrode vacuum furnace, Ni, Co, Cr, Mo, Nb, Ti, Si and C are added in vaccum sensitive stove in the form of respectively self-existent homozygous gold element and carry out incipient melting.

5. the preparation method according to claim 4, it is characterised in that: before heat treatment, first to the steel ingot of Homogenization Treatments It is forged, carries out the heat treatment again after obtaining forging bar.

6. preparation method according to claim 5, it is characterised in that: the heat treatment includes the solid solution heat that sequence carries out Processing and aging strengthening model.

Technical field

The present invention relates to a kind of high temperature alloys to belong to metallurgical production process more particularly, to a kind of low expansion superalloy Manufacturing technology field.The invention further relates to a kind of preparation methods for the low expansion superalloy.

Background technique

Fe-Ni-Co low expansion superalloy is a kind of novel aeronautical material, such alloy is with higher at 650 DEG C Intensity, low-expansion coefficient and nearly constant constant elasticity modulus.Mainly for the manufacture of aero-turbine outer ring, compressor The clearance control skids such as ring are obturaged with combustion chamber.Due to the characteristic of its low bulk, hair can be effectively controlled under high-temperature work environment Gap size between motivation dynamic component and static component reduces gas losses to engine efficiency is improved, and reducing oil consumption all has Highly important effect.

Due to being free of Cr in Fe-Ni-Co low expansion superalloy, accelerate grain boundary oxidation brittleness tendency with stress, This is because when temperature be higher than 500 DEG C or more when, oxygen grain boundary diffusion causes grain-boundary brittleness, thus drop low-alloyed plasticity and High-temperature duration life.By adding Cr, Mo element in low expansion superalloy, the stress of alloy can be inhibited to accelerate grain boundary oxidation Brittleness tendency, improves the high-temperature physical property of alloy.But excessive Cr constituent content can significantly improve the thermal expansion coefficient of alloy, Therefore the Cr constituent content how rationally controlled in alloy becomes for Fe-Ni-Co low expansion superalloy high-temperature physical property An important factor for.

Summary of the invention

The technical problems to be solved by the present invention are: it is low swollen to provide that a kind of high-temperature physical property is excellent, Cr content is moderate Swollen high temperature alloy.The present invention also provides a kind of preparation methods for the low expansion superalloy.

Used technical solution is to solve above-mentioned technical problem: a kind of low expansion superalloy, the low bulk High temperature alloy is the smelting homogenization heat treatment forging for including following weight parts component,

The Ni, 13~15% Co, 1.5~1.8% Ti, 4.5~5.2% that the parts by weight of component is 35~40% Nb+Ta, the Cr of 0.2-0.5%, the Si of 0.1~0.3% Mo, 0.2-0.4%, C :≤0.06%, remaining is Fe and can not The impurity avoided,

The creep rupture life > 100h for smelting homogenization heat treatment forging at 650 DEG C/510MPa.

Further, the total content of Ni+Co is 50%~52% in above-mentioned parts by weight of component.

The preferred mode of the above solution is that inevitable impurity includes O, S and P, content in above-mentioned parts by weight of component Respectively O≤0.01%, S≤0.015%, P≤0.015%.

A kind of preparation method for the low expansion superalloy, the preparation method is using homozygous gold element true The melting of duplex technique, ingot casting, Homogenization Treatments and the several steps of heat treatment successively carried out in empty induction furnace+consumable electrode vacuum furnace Suddenly,

When wherein homozygous gold element successively carries out duplex technique melting in vaccum sensitive stove+consumable electrode vacuum furnace, Ni, Co, Cr, Mo, Nb, Ti, Si and C are added in vaccum sensitive stove in the form of respectively self-existent homozygous gold element and are carried out just It is molten.

Further, before heat treatment, first forged to the steel ingot of Homogenization Treatments, obtain after forging bar again into The row heat treatment.

The preferred mode of the above solution is that the heat treatment includes at the solution heat treatment and timeliness heat of sequence progress Reason.

The beneficial effects of the present invention are: the application in the Fe-Ni-Co low bulk high temperature of the original not component containing Cr by closing Jin Zhongjia Cr component, and the content of the Cr component is controlled in reasonable range；Then using Ni, Co, Cr, Mo, Nb, Ti, Si and C etc. homozygosis gold element successively carried out in vaccum sensitive stove+consumable electrode vacuum furnace the melting of duplex technique, ingot casting, uniformly Change processing and be heat-treated several steps to manufacture the low expansion superalloy, in this way, since finished product low bulk high temperature closes The Cr element in control range is contained in gold, is had at 650 DEG C to not only maintain Fe-Ni-Co low expansion superalloy Some higher-strengths, the characteristic of low-expansion coefficient and nearly constant constant elasticity modulus, also alleviate Fe-Ni- by Cr component The grain boundary oxidation brittleness of Co low expansion superalloy is inclined to, and the notch sensitivity of Fe-Ni-Co low expansion superalloy is reduced, And then significantly extend its high-temperature duration life.

Specific embodiment

In order to solve the above technical problems existing in the prior art, a kind of high-temperature physical property provided by the invention is excellent Low expansion superalloy good, Cr content is moderate and a kind of preparation method for the low expansion superalloy.Described Low expansion superalloy is the smelting homogenization heat treatment forging for including following weight parts component, and the parts by weight of component is 35~40% Ni, 13~15% Co, 1.5~1.8% Ti, the Cr of 4.5~5.2% Nb+Ta, 0.2-0.5%, 0.1 The Si of~0.3% Mo, 0.2-0.4%, C :≤0.06%, remaining is Fe and inevitable impurity, the smelting homogenization It is heat-treated creep rupture life > 100h of the forging at 650 DEG C/510MPa.The preparation method is using homozygous gold element in vacuum The melting of duplex technique, ingot casting, Homogenization Treatments and the several steps of heat treatment successively carried out in induction furnace+consumable electrode vacuum furnace, When wherein homozygous gold element successively carries out duplex technique melting in vaccum sensitive stove+consumable electrode vacuum furnace, Ni, Co, Cr, Mo, Nb, Ti, Si and C are added in vaccum sensitive stove in the form of respectively self-existent homozygous gold element and carry out incipient melting.The application is logical It crosses in original the Fe-Ni-Co low expansion superalloy of the component containing Cr and adds Cr component, and by the content control of the Cr component System is in reasonable range；Then using the homozygous gold element such as Ni, Co, Cr, Mo, Nb, Ti, Si and C in vaccum sensitive stove+vacuum The melting of duplex technique, ingot casting, Homogenization Treatments and the several steps of heat treatment successively carried out in self-consuming furnace are described to manufacture Low expansion superalloy, in this way, due to containing the Cr element in control range in finished product low expansion superalloy, thus not only Maintain the higher-strength that Fe-Ni-Co low expansion superalloy has at 650 DEG C, low-expansion coefficient and nearly constant constant The characteristic of elasticity modulus is also inclined to by the grain boundary oxidation brittleness that Cr component alleviates Fe-Ni-Co low expansion superalloy, drop The low notch sensitivity of Fe-Ni-Co low expansion superalloy, and then significantly extend its high-temperature duration life.

In above embodiment, in order to improve the higher-strength that low expansion superalloy has at 650 DEG C as far as possible, The characteristic of low-expansion coefficient and nearly constant constant elasticity modulus, and Fe-Ni-Co low expansion superalloy is alleviated as far as possible Crystal boundary grain boundary oxidation brittleness tendency, reduce the notch sensitivity of Fe-Ni-Co low expansion superalloy, and then significantly Extend its high-temperature duration life.The also corresponding other components of the application are controlled, i.e., in above-mentioned parts by weight of component, The total content of Ni+Co is 50%~52%.Inevitable impurity includes O, S and P, content difference in above-mentioned parts by weight of component For O≤0.01%, S≤0.015%, P≤0.015%.And in specific preparation process, before heat treatment, first to homogenization at The steel ingot of reason is forged, and carries out the heat treatment again after obtaining forging bar.The heat treatment includes what sequence carried out Solution heat treatment and aging strengthening model.