CN103469011A - High-temperature Ni-Cr alloy and preparation method thereof - Google Patents

Abstract

The invention provides a high-temperature Ni-Cr alloy. The high-temperature Ni-Cr alloy comprises the following elements by weight percent: 0.10-0.15 percent of C, 0-0.05 percent of Si, 0-0.05 percent of Mn, 45-48 percent of Cr, less than or equal to 0.02 percent of S, less than or equal to 0.02 percent of P, 0.5-1.5 percent of Al, 3.0-3.5 percent of Ti, 0.01-0.05 percent of Ca, the balance of Ni and inevitable impurities. The high-temperature Ni-Cr alloy provided by the invention has relatively excellent mechanical properties, such as relatively high tensile strength, high high-temperature rigidity and other mechanical properties, and is suitable for processing various high-temperature resistant and wear resistant parts for long-term use.

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 refer generally in 600 °～1100 ℃ oxidizing atmospheres and the exhaust gas corrosion condition under bear the alloy of larger stress energy life-time service.Generally speaking, superalloy is divided into iron-based, Ni-based and cobalt-based three classes by matrix, and middle with fastest developing speed, and using the widest is nickel-base alloy.The 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 and take Cr as main many other elements: Al, Ti, Nb, W, Mo, B, Ce, Zr etc.

Nickel base superalloy is divided into again distortion (hot-work) and casts 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 the distortion nickel base superalloy is subject to its carbon content and the how many restriction of alloy element, be the alloy of more difficult production, particularly chromium content is more difficult over 40% ni-base wrought superalloy.The present invention's this class technical barrier of will seeking to achieve breakthrough 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 meet the demand of some special occasions.Therefore be necessary to provide a kind of have high tensile, anti-higher temperature oxidation, can be under 1250 ℃ of atmosphere 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 objective of the invention is to provide a kind of nickel chromium high-temperature alloy with good mechanical properties.

In order to reach purpose 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 the 45-48 % by weight, and preferably the 45-47 % by weight, most preferably be 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, preferred 0.01～0.03 % by weight, and 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, preferred 0～0.03 % by weight, and 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) provide alloying ingredient according to following weight percent:

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

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

(d) after confirming that all operations were completes, in temperature, be tapping under 1350～1450 ℃, obtain nickel chromium high-temperature alloy;

(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/C H008:2005)

Cr: volumetry (NACIS/C H116:2005)

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

Al:ICP-AES method NACIS/C H 008:2005

C: infrared absorption method NACIS/C H 001:2005.

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

Embodiment

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

Embodiment 1

At first, prepare alloying ingredient according to each component of appointment in table 1:

(a) starting material that use

(b) secondly, described carbon (C), chromium (Cr), nickel (Ni) are added in the electrically molten magnesia crucible, its clout is added in hopper;

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

Finally, Si, Mn, Al, Ti, Ca, Ce add material bin in described intermediate in carry out alloying, in temperature, are tapping under 1350～1450 ℃, obtain containing the chromium superalloy.

(c) with vacuum metling gained steel ingot, after high-temperature homogenization, by the hot-work hammer cogging, become 45 * 45mm square billet again by being rolled into Ф 6.0mm wire rod, last cold Ф 1.5mm, Ф 3.2mm, the Ф 5.5mm various size silk material of scrabbling.

(d) by 1200 ℃ of water-cooled solution treatment+700 ℃ * within 50 hours, the air cooling timeliness detects mechanical property by technical qualification, analysis of chemical elements is pressed:

GB/T20123-2006

GB/T20124-2006

The GB/T11170-2008 method records.

Normal temperature mechanical property is measured and pressed: the GB/T2281-2010 method is carried out, and test result is listed in table 1 and table 2.

Embodiment 2-4

By four kinds of embodiment that difference is elementary composition of above method design, Fen Xi Knot really is listed as table 1.

Each component steel ingot according to appointment in table 1 passes through thermal processing distortion, produces the standard test specimen of test mechanical property, then passes through; Solution heat treatment or solid solution+timeliness thermal treatment, record the 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

[0051]table 2

Illustrate: the present invention in the time of 400 ℃, hot hardness HRC >=55.

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

Table 3

Can find out that from table 2 and table 3 superalloy that the embodiment of the present invention provides is higher containing Cr, and Al, Ti strengthening matrix is arranged.Tension and the yield strength of the superalloy that the embodiment of the present invention provides are higher, and the alloy property excellence is described, are 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 be under the atmosphere up to 1250 ℃ life-time service, there is excellent oxidation-resistance, hardness (HRC of 400 ℃ >=55) is at high temperature arranged simultaneously, especially be suitable as bearing materials and use.

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

Claims (6)

1. a nickel chromium high-temperature alloy, it comprises following element with weight percent:

With inevitable impurity.

2. nickel chromium high-temperature alloy as claimed in claim 1, is characterized in that, the content of described chromium (Cr) is 45～48 % by weight, and preferably 45.0～46 % by weight, most preferably be 45.5 % by weight.

3. nickel chromium high-temperature alloy as claimed in claim 1, is characterized in that, the content of described aluminium (Al) is 0.5～1.5 % by weight, preferably 0.8～1.0 % by weight.

4. nickel chromium high-temperature alloy as claimed in claim 1, is characterized in that, the content of described calcium (Ca) is 0.01～0.05 % by weight, preferred 0.01～0.03 % by weight, and more preferably 0.015 % by weight, most preferably be 0.02 % by weight.

5. nickel chromium high-temperature alloy as claimed in claim 1, is characterized in that, the content of described silicon (Si) is 0～0.05 % by weight, preferred 0～0.03 % by weight, and more preferably 0～0.02 % by weight, be preferably 0～0.01 % by weight the most.

6. prepare the method for the described nickel chromium high-temperature alloy of claim 1, it is characterized in that, the method comprises the following steps:

(a) provide alloying ingredient according to following weight percent:

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

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

(d) after confirming that all operations were completes, in temperature, be tapping under 1350～1450 ℃, obtain nickel chromium high-temperature alloy.

(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/C H008:2005)

Cr: volumetry (NACIS/C H116:2005)

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

Al:ICP-AES method NACIS/C H 008:2005

C: infrared absorption method NACIS/C H 001:2005.