CS207730B2 - Alloy on the base of nicle and chrome - Google Patents

Description

- -Λ THE SOCIALIST REPUBLIC OF CZECHOSLOVAK REPUBLIC (19) DESCRIPTION OF THE PATENT 207730 (11) (B2) ropes (22) Registered 02 03 79 (21) (PV 1429-79) (32) (31) (33) Priority 03 03 78 (8532/78), from 17 03 78 (10678/78), from 018 05 78 (18232/78), from 31 06 78 (25563/78) aod 18 08 78 (331806/78) United Kingdom (40 ) Published 30 05 80 (51) Int. C.3 C 22 C 19/05 ORAB FOR INVENTIONS AND DISCOVERIES (45) Published 15 03 84 (72)

Author of the invention PRATT ALLIN SIDNEY, WALLINGFORD and COUPLAND DUNCAN ROY, MAIDENHEAD (United Kingdom) (73)

JOHNSON, MATTHEY & CO., LIMITED, LONDON AND JAMES EDWARDRESTALL, FRIMLEY (UK) {54} Nickel-Chromium Alloy 1

BACKGROUND OF THE INVENTION The present invention relates to alloys containing metal platinum groups. In particular, the invention relates to nickel-chromium based alloys with a basic gamma structure comprising a platinum group metal. British Patent Specification No. 1520,630 discloses certain nickel and cobalt-based plastics containing metal-platinum groups and consisting in a weight concentration of substantially 40 to 78% nickel and / or cobalt, traces of up to 25% chromium, traces up to 15% of platinum group astopy metal up to 13% of aluminum and / or titanium. Such alloys exhibit considerable high temperature resistance, particularly in terms of strength and creep resistance, and are exceptionally suitable for purposes such as the manufacture of parts for use in the glass industry and in the aerospace industry. with jet engines and gas turbines.

It is believed that the metallurgical structure of the alloys of British Patent Specification No. 1,520,630 includes a gamma-phase basic mass of nickel and chromium containing, in a concentration by weight, a small amount of platinum group metal present together with up to 65% of the primary gamma phase which contains essentially nickel aluminide (N13AI), substituted with platinum group metal, chromium and other alloying additives. Most likely, more than 90% of the platinum group is present in the primary gamma phase and is believed to be predominantly replaced by the aluminum component of the phase. Although N13AI itself does not have useful physical properties for the demanding applications described above, it generally assumes that it is the presence of N13AI, i.e., the primary gamma phase, particularly the phase that also contains a platinum group metal in conjunction with one or the other phases that contribute to said temperature against high temperatures. It is also to be understood that alloys containing the primary gamma primary phase exhibit increased high temperature resistance compared to basic gamma containing alloys mixed with the primary gamma phase precipitate, but so far, such alloys have tended to exhibit relatively low corrosion resistance, especially at elevated temperatures. Accordingly, it is an object of the present invention to provide a novel alloy that eliminates these drawbacks. The object is achieved by a nickel-chromium based alloy according to the invention, which, apart from impurities, consists of an aluminum alloy of 4 207730 3 207730 to 13.5%, chromium in an amount of up to 6% by weight. one or more platinum group metals in a trace amount of up to 20% by weight of the total weight, and a nickel residue.

The term "platinum group metals" refers to platinum, rhodium, iridium, ruthenium, palladium and osmium. Of these, the use of one or more platinum or rhodium aruthenium groups is particularly preferred.

According to a further feature of the invention, the proposed alloy also contains hafnium in a trace amount of up to 5% by weight and / or tannin in a trace amount of up to 6% and / or tantalum in an amount of up to 12% by weight.

According to a further feature of the invention, the alloy further comprises traces up to said weight% of one or more of the following metals: niobium Θ% carbon 0.15% boron 0.1% cobalt 10% molybdenum 14% tungsten 14% zirconium 1.75% scandium, yttrium or rare earth oxides and / or oxides 3% silicon 0.25% magnesium 1% iron 10% manganese 0.25% vanadium 2%, of course, in addition to scandium, yttrium and rare earth oxides mentioned above, the alloys of the present invention may contain other additives, for example Zr, at least partially in the form of their oxides. The oxides may either be added as such to the other alloying compositions or formed in situ to form an alloy.

The preferred alloy of the present invention has the following weight percentages: Al 7.3; Ti 0,8; Co 6.5; Nb 0.99; Mo 1.0; Ta10.5; Cr 2; W 2; C 0.5; B 0.01; Zr 0.07; Pt 7.5a residue nickel.

The alloys of the present invention are constituted by the base dendritic primary phase ga-ma, filled with indentritic gamma and / or beta, alpha, borides, carbides, etc., the exact structure being dependent on the weight of the aluminum content. It is believed that the metalplatin group occurs at least in the primary gamma phase and in the beta NiAl phase. Sinters can be made by conventional vevacuum melting and casting processes, or, for example, by mechanical casting. The preferred method consists in one-way solidification which increases the mechanical strength in the solidification direction.

It has been found that the inventive alloys exhibit a temperature resistance of up to 1100 ° C in terms of strength and oxidation resistance, which is superior to that of most conventional nickel-based high alloyed alloys and approximately comparable to the prior art alloys of the primary gamma phase. . The inventive alloys also exhibit increased hot corrosion resistance compared to conventional prior art superalloys, as well as prior art alloys containing a primary phase gamma matrix. The following Table 1 shows examples of the inventive alloys together with various prior art alloys. The compositions herein are based on the amount of weight percent added, and it will be appreciated that the analysis of any given alloy would provide a composition which is marginally different from the composition provided.

In the accompanying drawings, the results of tests carried out with some of the compounds in which Figure 1 shows a comparison of tin G, R, and A, B shown in Table 1 are shown, Figure 2 shows a comparison of H and S alloys in the same table Fig. 3 shows a comparison of alloys J and W, Fig. 4 a comparison of alloys L and X and Fig. 5 a comparison of alloys N and Y, all of which were performed at 900 ° C, Fig. 6 shows the results sulfination resistance tests performed at 925 ° C for GP5 and GP4 alloys; and Fig. 7 shows the results of resistance tests against cyclic oxidation on two alloys of the invention.

rH O 207730 it

rH ca

H

CM

O i o í o P-i

N

CM

O o "O LO to φ corH i — Io" θ "ó ó

CO p-f

N

rH ώ to o_

O

HrH t * 'f Ή £ ίο

CD

IO o LO f> -

CO M M M T T T T T T r r r r r r r r r r

N

CM

Of

CQ co

I do

ISJ

CM

O what, -o

LO o

I-i

N

CM

<O i m 00 θ '

AND

About what

I i P-j

N to o

CD CO IO CM O CO "cm" cm "cm" Τ-Γ

WHAT CM WHAT WHAT WHAT WHAT cm ^ CO'to o tqOco "what" what "what" cm "o" t> "what" that "o"

Alloy composition (%) P-i-4 → P-Ca a

CO H CO

what CM 05 UD θ 'LO' IO CO CD

CM CM CO CM r I Η Η Η Η Η rH

CMO CO rH 'LO ^ rH CD ^ 1> γCO "!>" 00 "Φ

WHAT

CM CM CD to "CM" CM CM cm cm

CM> - CM CO CM ^ O 'IO rH' 'Φ 00 COC *> "t>" CO "t>" O "Cd"!>. "T> CM co

what "what" what CO CM CM what CO 'rH' θ 'CM CM' CM ^ · <Φ -3? what about "what"

CD cm "O CM O T O O CM_ £>" t <CO ">? Bs >>

WHAT ARE LOCM CO'tOco "Lo" what "COCM" · ^ 'what "what"

CD

rH co "o ^ CM LOCM CM" CM "CM"

CD cm "7 - 1 00 what Xf1co cm σ) what" what "o" o "cm" co "cm" CO CD ΙΟ "Φ * Φ

CM CM 00 CO I> O rH tx CO CO ^ CD_ COco "o" cd "what" what "cd" what "o" to "what" to "r ~ I rH

co oo "r-T CD ^ CM COCO rí o"

CM CO CM CO rH t> - CO CO ^ CDC <to "t>." to "t> Lx" CO "toθ 'θ'o"

CD

what about what co CM ^ tm. 1> γ CD "what" what "what" oo "t>." ^ 3 O <pa £ co

pQ

N 7 - 1 00 CO CM About CD To CD CO £>. what it is

ID CD N ^ CQCM CMDL, JX, o o

WHAT

Pj!>

Pm

7)

Claims (7)

207730 S The following Table 2 and Figures 1-5 show the results of tests to determine the resistance of salt to air in the various alloys of the present invention as compared to various alloys according to the state of the art. For each illustration, the result is related to NI3AI (Kj alloy. The following Table 3 and Fig. 6 show the results of sulfidation resistance tests performed by full immersion at 925 ° C for GP5 and GP4 alloys, while Fig. 7 is The results of the cyclic oxidation resistance tests on the two alloys according to the invention are compared to the commercially available highly alloyed alloys. In the cyclic oxidation resistance tests, each cycle consisted of heating the alloy to 1100 ° C and maintaining the alloy at that temperature. for a total of 40 minutes and then cooling the alloy to 20 ° C and keeping it at this temperature for a total of 20 minutes, Figure 7 is an commercially available alloy reported for comparison, consisting of chromium in an amount of 9% by weight. %, 10% cobalt, 12% tungsten, 1% niobium, 5% aluminum, 2% titanium, 0.15% carbon, 0.015% boron, 0.05% zirconium, and nickel residue. 2 Results of Corrosion Resistance Tests Caused by Salt Coating at 900 ° C (1.5 mg / cm 2 NH 2 Cl 2) Alloy Duration in hours and weight gain in mg / cm 2 24 hours 48 hours 72 hours 96 hours K 1. 5.1 mg / cm 2 7.3 mg / cm 2 10.5 mg / cm 2 12.3 mg / cm 2 G 32.3 mg / cm 2 70.1 mg / cm 2 104.6 mg / cm 2. 128.1 mg / cm2 A 4.9 mg / cm2 - 4.8 mg / cm2 5.4 mg / cm2 B 2.7 mg / cm2 3.2 mg / cm2 3.5 mg / cm2 3.8 mg / cm2 cm2 R 4.7 mg / cm2 11.2 mg / cm2 22.9 mg / cm2 41.5 mg / cm2 H 15.3 mg / cm2 24.5 mg / cm2 108 mg / cm2 111 mg / cm2 S 1 0 mg / cm2 3.7 mg / cm2 2.5 mg / cm2 5.0 mg / cm2 I 13 mg / cm2 23.5 mg / cm2 23.5 mg / cm2 23.9 mg / cm2 w 2.7 mg / cm2 4.3 mg / cm2 6.5 mg / cm2 7.8 mg / cm2 L 16.0 mg / cm2 28 mg / cm2 29.5 mg / cm2 30.3 mg / cm2 X 1.0 mg / cm2 2 mg / cm2 3.5 mg / cm2 - N 28.9 mg / cm2 75.9 mg / cm2 117.8 mg / cm2 123 mg / cm2 Y 1.0 mg / cm2 3.7 mg / cm2 Table 4.1 mg / cm 2 6.6 mg / cm 2 Sulphide test, performed by total immersion at 925 ° C to 10% Na-Cl and Na 2 SO 4. Test duration and descaled weight loss per unit area (mg / cm-2) 1 hour 4 hours 15 hours GP4 GP5 149.1 mg / cm29.4 mg / cm2 430.7 mg / cm240.1 mg / cm2 specimen completely attacked8 , 09 mg / cm2 PSED Μ ET A nickel-chromium based alloy characterized in that, apart from impurities, the aluminium consists of 4 to 13.5 percent by weight, chromium in the amount of up to 6 percent by weight, one or more metal platinum groups in the amount of up to 20 percent by weight. weight and rest. 2. An alloy as claimed in claim 1, characterized in that it comprises one or more hafnium metals, up to 5% by weight, titanium by up to 6% by weight, and tantalum by up to 12% by weight. 3. An alloy according to claim 1 or 2, characterized in that it contains one or more of the following metals in an amount by weight of up to the indicated percentages: niobium 6% carbon 0.15% boron 0.1% cobalt 10% molybdenum 14% tungsten 14% zirconium 1.75% scandium, yttrium or their oxides and / or rare earth metals or oxides 3% silicon 0.25% magnesium 1% iron 10% manganese 0.25% vanadium 2% 4. An alloy as claimed in claim 3, wherein the scandium, yttrium and rare earth metals 2077307 are at least partially present in the form of their oxides. 5. The alloy of item 3, wherein the niobium, carbon, boron, cobalt, molybdenum, wol-fram, zirconium, silicon, magnesium, iron, manganese, and vanadium alloys are present at least partially in the form of their oxides. and 6. An alloy as claimed in claim 3, wherein said alloy is present in a mass concentration of 7.3% / alumina, 0.8% titanium, 6.5% cobalt, 0.99% niobium, 1.0% molybdenum, 10.5% tantalum, 2% chromium, 2% tungsten, 0.5% carbon, 0.01% boron, 0.07% zirconium, 7.5% platinum and the remainder nickel. 7 sheets of drawings # Savarografla, n. AAvod 7, Most