CN103469011B - Nickel chromium high-temperature alloy and preparation method thereof - Google Patents

Abstract

The invention provides a kind of nickel chromium high-temperature alloy, it comprises following element with weight percent: C0.10 ~ 0.15; Si0 ~ 0.05; Mn0 ~ 0.05; Cr45 ~ 48; S is less than or equal to 0.02; P is less than or equal to 0.02; Al0.5 ~ 1.5; Ti3.0 ~ 3.5; Ca0.01 ~ 0.05; Ni surplus; With inevitable impurity.Nickel chromium high-temperature alloy provided by the invention has better mechanical property, such as, have the mechanical property such as higher tensile strength and high hot hardness, is applicable to the various heat resistant and wear resistant of processing and damages part life-time service.

Description

Nickel chromium high-temperature alloy and preparation method thereof

Technical field

The present invention relates to a kind of superalloy and preparation method thereof, especially a kind of containing high chromium ni-base wrought superalloy and preparation method thereof.

Background technology

Superalloy refers generally in 600 ° ~ 1100 DEG C oxidizing atmospheres and bears the alloy of larger stress energy life-time service under exhaust gas corrosion condition.Generally speaking, superalloy is divided into iron-based, Ni-based and cobalt-based three class by matrix, and middle with fastest developing speed, and using the widest is nickel-base alloy.Superalloy performance must reach that to have be well thermostability, in order to have high heat resistance and the structure stability of life-time service, so must carry out the strengthening of element on its matrix.

Add other elements many based on Cr: Al, Ti, Nb, W, Mo, B, Ce, Zr etc.

Nickel base superalloy is divided into again distortion (hot-work) and casting two kinds, cast nickel-base alloy is not subject to the restriction of its higher carbon content and relatively large alloy element, more easily produce, but distortion nickel base superalloy is by its carbon content and the how many restriction of alloy element, be the alloy of more difficult production, particularly the ni-base wrought superalloy of chromium content more than 40% is more difficult.The present invention will seek to achieve breakthrough this kind of technical barrier exactly.

Nickel, the chromium superalloy of current commercial 0Cr30Ni70 (standard code NS11), the patent No.: CN1831165A, be ni-base wrought superalloy, but its chromium content does not all have overweight 45%, therefore its tensile strength is lower, and particularly high-temperature oxidation resistance and hot hardness are difficult to the demand meeting some special occasions.Therefore be necessary to provide one to have high tensile, the oxidation of anti-higher temperature, can under 1250 DEG C of air the distortion nickel base superalloy of the high rigidity of life-time service.It is main purpose of the present invention.

Summary of the invention

For the deficiencies in the prior art, the object of the invention is to provide a kind of nickel chromium high-temperature alloy with good mechanical properties.

In order to reach object of the present invention, the present invention realizes by the following technical solutions:

The invention provides a kind of nickel chromium high-temperature alloy, it comprises following element with weight percent:

With inevitable impurity.

Preferably, the content of described chromium (Cr) is 45-48 % by weight, and preferred 45-47 % by weight, most preferably is 45.5 % by weight.

Further, the content of described aluminium (Al) is 0.5 ~ 1.5 % by weight, preferably 0.8 ~ 1.0 % by weight.

Preferably, the content of described calcium (Ca) is 0.01 ~ 0.05 % by weight, preferably 0.01 ~ 0.03 % by weight, more preferably 0.015 % by weight, most preferably be 0.02 % by weight.

Preferably, the content of described silicon (Si) is 0 ~ 0.05 % by weight, preferably 0 ~ 0.03 % by weight, more preferably 0 ~ 0.02 % by weight, be preferably 0 ~ 0.01 % by weight the most.

Prepare the method for above-mentioned nickel chromium high-temperature alloy, the method comprises the following steps:

A () provides alloying ingredient according to following weight percent:

B described C, Cr, Ni add in electrically molten magnesia (MgO) matter crucible by (), its clout is contained in hopper; Every stove calculates batching by gross weight 25kg.

C crucible is placed in melting under vacuum by (), obtain intermediate; And Si, Mn, Al, Ti, Ca in hopper are carried out alloying smelting respectively by technique;

D (), after confirmation all operations completes, is tapped, is obtained nickel chromium high-temperature alloy at temperature is 1350 ~ 1450 DEG C;

(e) sampling analysis chemical composition, analytical procedure;

Si:ICP-AES method (NACIS/CH013:2005)

P:ICP-AES method (NACIS/CH011:2005)

Mn, Al:ICP-AES method (NACIS/CH008:2005)

Cr: volumetry (NACIS/CH116:2005)

C, S: infrared absorption method (GB/T20123-2006)

Al:ICP-AES method NACIS/CH008:2005

C: infrared absorption method NACIS/CH001:2005.

Compared with prior art, the mechanical properties such as nickel chromium high-temperature alloy provided by the invention has better mechanical property, such as, under having higher tensile strength and high temperature higher hardness, are applicable to the various heat resistant and wear resistant of processing and damage part life-time service.Nichrome of the present invention is the steel ingot by preparing, and produces various section bar after thermal distortion, the component used under being especially suitable for aviation, petrochemical industry, dynamo-electric various hot conditions.

Embodiment

Exemplify several embodiments below so that the present invention is described in detail, the description of this part is only exemplary and indicative explaination, should not form and produce any restriction to protection scope of the present invention.

Embodiment 1

First, alloying ingredient is prepared according to each component of specifying in table 1:

A starting material that () uses

B () secondly, add in electrically molten magnesia crucible by described carbon (C), chromium (Cr), nickel (Ni), its clout is added in hopper;

Then, crucible is placed in melting under vacuum, obtains intermediate;

Finally, Si, Mn, Al, Ti, Ca, the Ce added in described intermediate in material bin carries out alloying, taps at temperature is 1350 ~ 1450 DEG C, obtains containing chromium superalloy.

C (), with vacuum metling gained steel ingot, after high-temperature homogenization, becomes 45 × 45mm square billet again by being rolled into Ф 6.0mm wire rod by hot-work hammer cogging, finally coldly scrabble Ф 1.5mm, Ф 3.2mm, Ф 5.5mm various size silk material.

D () detects mechanical property by 1200 DEG C of water-cooled solution treatment+700 DEG C × 50 hours air cooling timeliness by technical qualification, analysis of chemical elements is pressed:

GB/T20123-2006

GB/T20124-2006

GB/T11170-2008 method records.

Normal temperature mechanical property measures and presses: GB/T2281-2010 method performs, and test result is listed in table 1 and table 2.

Embodiment 2-4

By the embodiment that above method design four kinds of differences are elementary composition, Fen Xi Knot fruit row are as table 1.

According to each component steel ingot of specifying in table 1 by thermal processing distortion, produce the standard test specimen of test mechanical property, then pass through; Solution heat treatment or solid solution+aging strengthening model, record mechanical property row as table 2.

Have four groups of results.

Table 1

Element Wt%	Embodiment 1	Embodiment 2	Embodiment 3	Embodiment 4
					C	0.11	0.13	0.14	0.15
Si	0.005	0.02	0.04	0.03
					Mn	0.03	0.01	0.04	0.02
Cr	45.08	45.12	45.28	45.36
					S	0.003	0.002	0.004	0.003
P	0.006	0.005	0.007	0.005
					Al	0.81	0.71	1.08	0.91
Ti	3.11	3.20	3.01	3.05
					Ca	0.02	0.04	0.05	0.03
Ni	Surplus	Surplus	Surplus	Surplus

Table 2

Illustrate: the present invention 400 DEG C time, hot hardness HRC >=55.

In order to contrast, carry out contrast with commercial 1Cr30Ni70 (standard code NS11) and the patent No.: CN1831165A and listing in table 3:

Table 3

Can find out that the superalloy that the embodiment of the present invention provides is higher containing Cr from table 2 and table 3, and have Al, Ti to strengthen matrix.The tension of the superalloy that the embodiment of the present invention provides and yield strength higher, illustrate that alloy property is excellent, be applicable to the various high temperature resistant component of processing.The product of the nickel chromium high-temperature alloy that the embodiment of the present invention provides can under up to the air of 1250 DEG C life-time service, there is excellent oxidation-resistance, at high temperature have simultaneously compared with hardness (HRC >=55 of 400 DEG C), be especially suitable as bearing materials and use.

The foregoing is only the preferred embodiments of the present invention; not thereby the scope of the claims of the present invention is limited; every utilize description of the present invention to do equivalent structure or equivalent flow process conversion; or be directly or indirectly used in other relevant technical fields, be all in like manner included in scope of patent protection of the present invention.

Claims (1)

1. prepare a method for nickel chromium high-temperature alloy, described nickel chromium high-temperature alloy comprises following element with weight percent:

C0.10～0.15，

Si0～0.05，

Mn0～0.05，

Cr45～48，

S≤0.02，

P≤0.02，

Al0.5～1.5，

Ti3.0～3.5，

Ca0.01～0.05，

Ni surplus,

With inevitable impurity;

It is characterized in that, the method comprises the following steps:

A () provides alloying ingredient according to following weight percent:

C0.10～0.15，

Si0～0.05，

Mn0～0.05，

Cr45～48，

S≤0.02，

P≤0.02，

Al0.5～1.5，

Ti3.0～3.5，

Ca0.01～0.05，

Ni surplus,

B described C, Cr, Ni add in electrically molten magnesia (MgO) matter crucible by (), its clout is contained in hopper; Every stove calculates batching by gross weight 25kg;

C crucible is placed in melting under vacuum by (), obtain intermediate; And Si, Mn, Al, Ti, Ca in hopper are carried out alloying smelting respectively by technique;

D (), after confirmation all operations completes, is come out of the stove, is obtained nickel chromium high-temperature alloy at temperature is 1350 ~ 1450 DEG C;

(e) sampling analysis chemical composition, analytical procedure;

Si:ICP ?AES method (NACIS/CH013:2005)

P:ICP ?AES method (NACIS/CH011:2005)

Mn, Al:ICP ?AES method (NACIS/CH008:2005)

Cr: volumetry (NACIS/CH116:2005)

C, S: infrared absorption method (GB/T20123 ?2006)

Al:ICP ?AES method NACIS/CH008:2005.