CN102485930A

CN102485930A - Antioxidant low-expansion high-temperature alloy

Info

Publication number: CN102485930A
Application number: CN2010105681114A
Authority: CN
Inventors: 孙文儒; 孙晓峰; 于连旭; 孙雅茹; 祁峰; 张伟红; 刘芳; 贾丹; 信昕; 郭守仁; 胡壮麒
Original assignee: Institute of Metal Research of CAS
Current assignee: Institute of Metal Research of CAS
Priority date: 2010-12-01
Filing date: 2010-12-01
Publication date: 2012-06-06

Abstract

The invention discloses antioxidant low-expansion high-temperature alloy, comprising 26-31 wt% of Co, 23-27 wt% of Ni, 3.8-5.8 wt% of Nb, 0.6-1.0 wt% of Ti, 0.1-0.5 wt% of Si, 2.0-3.4 wt% of Cr, 0.8-2.0 wt% of Al, 0.02-0.15 wt% of Zr, 0.013-0.028 wt% of B, and the balance of Fe. The high-temperature alloy guarantees the resistance to oxidation and high intensity, and simultaneously greatly reduces the thermal expansion coefficient of the alloy, increases long-term time efficiency organizational performance stability, and has the advantages of long service life and no notch sensitivity.

Description

A kind of anti-oxidant low expansion superalloy

Technical field

The present invention relates to the superalloy field, a kind of anti-oxidant low expansion superalloy is provided especially.

Background technology

Low expansion superalloy is used to manufacture thin-walled stator structure parts, and like casing, outer shroud, the ring etc. of obturaging, the gap between function unit simply and effectively reduces the weight and the cost of mover.The following low expansion superalloy of the demand for development of aerospace aircraft engine has lower coefficient of expansion rate of change, better antioxidant property, HS more.Alloys such as IN903, IN907, IN909, HRA929, HRA929C, EXP4005, IN783, Thermo-Span have been developed for many years.See that from the development of low thermal expansion superalloys course total development trend is:

(1) suitably reduce the Ni/Co ratio, organize under the stable prerequisite in assurance, further reducing Fe-Co-Ni is the thermal expansivity of alloy.For example Ni/Co is about 2.7 among IN907 and the IN909, and Ni/Co is about 1.3 among HRA929 and the HRA929C, and Ni/Co is about 1 among the EXP4005, and Ni/Co is about 0.8 among IN783 and the Thermo-Span.

(2) add Al in right amount, under the prerequisite that does not cause notch sensitivity, to improve oxidation-resistance and to improve intensity.For example Al is about 0.07 among IN907 and the IN909, and Al is about 0.55 among HRA929 and the HRA929C, and Al is about 0.45 among the Thermo-Span, and Al has brought up to about 5.4% among EXP4005 and the IN783.

(3) add Cr in right amount, to improve the oxidation-resistance of this type alloy.For example the IN907 of early development, IN909, HRA929 alloy do not contain Cr, and advanced HRA929C contains that Cr is about 2%, IN783 contains that Cr is about 3%, Thermo-Span contains Cr about 5.5%.Can improve oxidation-resistance though add Cr, also improve the thermal expansivity of alloy simultaneously.

In existing low expansion superalloy, still do not have and have relatively low thermel expansion coefficient, good oxidation resistance, excellent enduring quality and the alloy of non-notch susceptibility simultaneously concurrently.Such as alloys such as IN909, though the coefficient of expansion is low, oxidation-resistance is poor, and creep rupture life is lower; Though IN783 alloy good in oxidation resistance, creep rupture life is low, and the coefficient of expansion is high.Therefore the low expansion superalloy of developing a kind of excellent combination property remains a job highly significant.

Summary of the invention

The object of the present invention is to provide that a kind of thermal expansivity is low, non-notch susceptibility, high room temperature strength, the long-term stable novel anti oxidation low expansion superalloy material of aging performance, can't have relatively low thermel expansion coefficient, good oxidation resistance, excellent enduring quality and the problem of non-notch susceptibility simultaneously concurrently to solve alloy in the past.

The present invention provides a kind of anti-oxidant low expansion superalloy, it is characterized in that: described superalloy is made up of according to weight ratio following composition,

Co 26%～31%； Ni 23%～27%；

Nb 3.8%～5.8%； Ti 0.6%~1.0%；

Si 0.1%~0.5%； Cr 2.0%~3.4%；

Al 0.8%~2.0%； Zr 0.02%~0.15%；

B 0.013% ~ 0.028%; The Fe surplus.

Preferably,

Co 27%～29.5%； Ni 24%～26%；

Nb 4.5%～5.4%； Ti 0.7%~0.9%；

Si 0.2%~0.4%； Cr 2.5%~3.2%；

Al 1.2%~1.8%； Zr 0.03%~0.1%；

B 0.016% ~ 0.023%; The Fe surplus.

Anti-oxidant low expansion superalloy provided by the invention mainly is on the basis of Carpenter company's T hermo-Span alloy, to improve and come, and has wherein reduced the Cr content in the alloy, is 2.0% ~ 3.4%, has obviously reduced the thermal expansivity of alloy; Improved the Al content in the alloy; Be 0.8% ~ 2.0%, guarantee that oxidation-resistance do not lose too much the time because of falling Cr, promptly increased γ ' phase amount; Improve the stability of γ ' phase again, thereby obtained the stability of room temperature strength and 650 ℃ of long-term aging performances preferably; Simultaneously in alloy, added two kinds of new composition Zr and B, improved the crystal boundary precipitation state, increased grain-boundary strength, improved the creep rupture life of alloy, and eliminated persistent notch sensitivity.

Anti-oxidant low expansion superalloy provided by the invention, its concrete performance is following:

Thermal expansivity is:

Temperature (℃)	Linear thermal expansion (%)	Average coefficient of linear expansion (10 ^-6·℃ ^-1）
			Reference temperature	0	0
100	0.0543	6.79
			200	0.129	7.18
300	0.204	7.29
			400	0.303	7.98
500	0.456	9.49
			600	0.622	10.7
700	0.806	11.8
			800	1.05	13.5
900	1.30	14.8

Enduring quality is:

Temperature (℃)	Stress (MPa)	Smooth duration (h)	Breach duration (h)
				650	600	480	600

The enduring quality of 650 ℃ of timeliness 1000h is:

Temperature (℃)	Stress (MPa)	Smooth duration (h)	Breach duration (h)
				650	600	460	>;500

The concrete preparation method of anti-oxidant low expansion superalloy provided by the invention is following:

Adopt the conventional melting technology alloy smelting of vacuum induction ingot casting, through homogenizing handle (1180 ℃ of 1100 ℃ * 10h+ * 40h), in 1100 ℃ of forgings, be rolled into bar, bar is carried out following thermal treatment:

Solution treatment: 1093 ℃ * 1h, air cooling;

Ageing treatment: 721 ℃ * 8h, 55 ℃/h stove is cold, and 621 ℃ * 8h, air cooling.

Anti-oxidant low expansion superalloy provided by the invention; With existing alloy phase ratio; Its thermal expansivity low (like Fig. 1), good in oxidation resistance (like Fig. 2), 650 ℃/600MPa creep rupture life is up to 485h; Be in the existing low expansion superalloy creep rupture life the highest, non-notch susceptibility (like following table).

Figure 2010105681114100002DEST_PATH_IMAGE001

A kind of anti-oxidant low expansion superalloy provided by the invention; Its advantage is: this superalloy is guaranteeing oxidation-resistance and high-intensity while; Reduced the thermal expansivity of alloy significantly; Long-term timeliness structure property stability also increases, and long service life, non-notch susceptibility.

Description of drawings

Fig. 1 is the thermal expansivity figure of low expansion superalloy;

Fig. 2 is 650 ℃ of oxidation weight gain curve figure of low expansion superalloy;

Fig. 3 is the mean thermal expansion coefficients figure of alloy;

Fig. 4 is 650 ℃ of oxidation weight gain curve figure of alloy.

Embodiment

Below in conjunction with concrete embodiment the present invention is done further explanation, but it does not limit the present invention.

Concrete alloying constituent is following:

Alloy No.	Fe	Co	Ni	Nb	Ti	Si	Cr	Al	Zr	B
											Embodiment 1	Bal.	26	27	3.8	1.0	0.1	2.8	1.5	0.05	0.028
Embodiment 2	Bal.	29.4	24.5	4.8	0.85	0.27	2.0	1.75	0.11	0.018
											Embodiment 3	Bal.	29.4	24.5	4.8	0.85	0.27	3.4	0.8	0.02	0.013
Embodiment 4	Bal.	29.4	24.5	4.8	0.85	0.27	2.2	2.00	0.15	0.022
											Comparative Examples 1	Bal.	29.4	24.5	4.8	0.85	0.27	1.5	1.45	0.18	0.030
Comparative Examples 2	Bal.	29.4	24.5	4.8	0.85	0.27	3.0	2.1	-	0.004
											Comparative Examples 3	Bal.	29.4	24.5	4.8	0.85	0.27	5.5	0.45	－	0.006

The concrete preparation method of above alloy is, and adopts the conventional melting technology alloy smelting of vacuum induction ingot casting, through homogenizing handle (1180 ℃ of 1100 ℃ * 10h+ * 40h), in 1100 ℃ of forgings, be rolled into bar, bar is carried out following thermal treatment:

Solution treatment: 1093 ℃ * 1h, air cooling;

Performance test:

After respectively above alloy being mean thermal expansion coefficients, 650 ℃ of oxidation weight gains, room temperatures and 650 ℃ of tensile properties, 650 ℃/600MPa creep rupture life, 650 ℃ of timeliness 1000h; Behind alloy at room temperature and 650 ℃ of tensile properties and the 650 ℃ of timeliness 1000h; The test of the 650 ℃/600MPa enduring quality aspect of alloy; Wherein, The mean thermal expansion coefficients of alloy and 650 ℃ of oxidation weight gain curves are seen Fig. 3, Fig. 4 respectively, and wherein the 1#, 2#, 3#, 4#, 5#, 6#, 7# among the figure and embodiment 1, embodiment 2, embodiment 3, embodiment 4, Comparative Examples 1, Comparative Examples 2, Comparative Examples 3 are corresponding one by one.

Alloy at room temperature and 650 ℃ of tensile property test results are seen table 1

Table 1

Figure 2010105681114100002DEST_PATH_IMAGE002

650 ℃/600MPa test result creep rupture life of alloy is seen table 2

Table 2

Behind 650 ℃ of timeliness 1000h, alloy at room temperature and 650 ℃ of tensile property test results are seen table 3

Table 3

Figure 2010105681114100002DEST_PATH_IMAGE004

Behind 650 ℃ of timeliness 1000h, the 650 ℃/600MPa enduring quality test result of alloy is seen table 4

Table 4

Figure 2010105681114100002DEST_PATH_IMAGE005

Claims

1. anti-oxidant low expansion superalloy, it is characterized in that: described superalloy is made up of according to weight ratio following composition,

Co 26%～31%； Ni 23%～27%；

Nb 3.8%～5.8%； Ti 0.6%～1.0%；

Si 0.1%～0.5%； Cr 2.0%～3.4%；

Al 0.8%～2.0%； Zr 0.02%~0.15%；

B 0.013%～0.028%; The Fe surplus.

2. according to the described anti-oxidant low expansion superalloy of claim 1, it is characterized in that: described superalloy is made up of according to weight ratio following composition,

Co 27%～29.5%； Ni 24%～26%；

Nb 4.5%～5.4%； Ti 0.7%~0.9%；

Si 0.2%~0.4%； Cr 2.5%~3.2%；

Al 1.2%~1.8%； Zr 0.03%~0.1%；

B 0.016% ~ 0.023%; The Fe surplus.