US2497667A - Heat-treatment of nickel-chromium alloys - Google Patents
Heat-treatment of nickel-chromium alloys Download PDFInfo
- Publication number
- US2497667A US2497667A US726441A US72644147A US2497667A US 2497667 A US2497667 A US 2497667A US 726441 A US726441 A US 726441A US 72644147 A US72644147 A US 72644147A US 2497667 A US2497667 A US 2497667A
- Authority
- US
- United States
- Prior art keywords
- heat treatment
- nickel
- hours
- treatment
- per cent
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 238000010438 heat treatment Methods 0.000 title claims description 25
- 229910000623 nickel–chromium alloy Inorganic materials 0.000 title description 4
- 239000000788 chromium alloy Substances 0.000 title description 2
- 229910045601 alloy Inorganic materials 0.000 claims description 9
- 239000000956 alloy Substances 0.000 claims description 9
- 230000032683 aging Effects 0.000 claims description 4
- 238000002791 soaking Methods 0.000 claims description 4
- 229910018487 Ni—Cr Inorganic materials 0.000 claims description 3
- VNNRSPGTAMTISX-UHFFFAOYSA-N chromium nickel Chemical compound [Cr].[Ni] VNNRSPGTAMTISX-UHFFFAOYSA-N 0.000 claims description 3
- 238000001556 precipitation Methods 0.000 claims description 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 8
- 238000000034 method Methods 0.000 description 8
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 6
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 6
- 239000010936 titanium Substances 0.000 description 6
- 229910052719 titanium Inorganic materials 0.000 description 6
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 4
- 229910052804 chromium Inorganic materials 0.000 description 4
- 239000011651 chromium Substances 0.000 description 4
- 229910052759 nickel Inorganic materials 0.000 description 4
- 238000010791 quenching Methods 0.000 description 4
- 238000001816 cooling Methods 0.000 description 3
- 229910052742 iron Inorganic materials 0.000 description 3
- 230000000171 quenching effect Effects 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- 239000010941 cobalt Substances 0.000 description 2
- 229910017052 cobalt Inorganic materials 0.000 description 2
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 2
- 229910001235 nimonic Inorganic materials 0.000 description 2
- 230000035882 stress Effects 0.000 description 2
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C19/00—Alloys based on nickel or cobalt
- C22C19/03—Alloys based on nickel or cobalt based on nickel
- C22C19/05—Alloys based on nickel or cobalt based on nickel with chromium
- C22C19/058—Alloys based on nickel or cobalt based on nickel with chromium without Mo and W
Definitions
- This invention relates to a method of processing nickel-chromium alloys containing a hardening element and being capable of being hardened by a precipitation heat treatment.
- Nimonic 80 substantially nickel 80 per cent, chromium 20 per cent with small percentages of titanium and iron
- the normal heat treatment is to soak for 8 hours at 1050 C., cool in air or quench in oil and then to heat for at least 16 hours at 700 C. followed by air cooling or quenching.
- the preliminary heat treatment is for a time between five and thirty hours and the last part may be at a lower temperature than the first part.
- the temperature may be dropped by an amount not exceeding 200' C., preferably between 150 C. and 200 C. This drop may be a gradual one or be made by one or more steps.
- Nimonic 80 Eight specimens of Nimonic 80 were prepared. Four were given the usual heat treatment, and four were given the usual heat treatment preceded by one consisting of 6 hours at 850 C. and 16 hours at 700' C.
- Creep tests to fracture were carried out at 700 C. with a stress of 23 tons per square inch. The times to fracture were:
- the step of subjecting the alloy to a twostage heat treatment by first heating it during several hours at 650 to 895 C. and thereafter subjecting it during 8 to 30 hours to soaking at 1020 to 1100 C., then cooling and finally ageing at 650 to 850 C.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Articles (AREA)
Description
Patented Feb. 14, 1950 2,497,667 HEAT-TREATMENT F NICKEL-CHROMIUM ALLQYS Harold Ernest Gresham, Little Eaton, and Douglas Wilson Hall, West Monkseaton, England, assignors to Rolls-Royce Limited, Derby, England N 0 Drawing. Application February 4, 1947, Serial No. 726,441. In Great Britain February 8, 1946 8 Claims. 1
This invention relates to a method of processing nickel-chromium alloys containing a hardening element and being capable of being hardened by a precipitation heat treatment.
Hitherto the heat treatment of these alloys has consisted of soaking at 1020 to 1100 C. cooling or quenching and then ageing at 650 to 850 C.
With an alloy sold under the trade name Nimonic 80 (substantially nickel 80 per cent, chromium 20 per cent with small percentages of titanium and iron) the normal heat treatment is to soak for 8 hours at 1050 C., cool in air or quench in oil and then to heat for at least 16 hours at 700 C. followed by air cooling or quenching.
This is done in order to develop high hot tensile strength and good creep resistance properties.
The applicants have discovered very unexpectedly that the creep properties of these alloys are very considerably increased if before the above stated heat treatment is carried out the alloy is given a preliminary heat treatment from 650 C. to 895 C.
Preferably the preliminary heat treatment is for a time between five and thirty hours and the last part may be at a lower temperature than the first part. The temperature may be dropped by an amount not exceeding 200' C., preferably between 150 C. and 200 C. This drop may be a gradual one or be made by one or more steps.
It is generally convenient to cool the alloy after this preliminary heat treatment and before the normal heat treatment but this is not essential.
Examples of the efiect of this heat treatment are as follows:
Eight specimens of Nimonic 80 were prepared. Four were given the usual heat treatment, and four were given the usual heat treatment preceded by one consisting of 6 hours at 850 C. and 16 hours at 700' C.
Creep tests to fracture were carried out at 700 C. with a stress of 23 tons per square inch. The times to fracture were:
{Preliminary healt reatmen accor gigg g gg ing to this invention plus usual heat treatment Hours Hours 57% 75% 62 22% 30 40% 37 Mean taining aluminum 1.0 to 9.0 per cent, chromium 13 to 23 per cent, cobalt exceeding 10 but not exceeding 35 per cent, titanium 0.01 to 5.0 per cent, remainder and at least 30 per cent nickel under a stress of 15 tons at 800 C. gave a creep life to fracture of hours after the heat treatment proposed in the provisional specification namely soaking 1020-1100" C. for from 8 to 30 hours, quenching and ageing at 650 to 850 C. from 8 to 30 hours. When given first the preliminary heat treatment according to this invention followed by the said proposed heat treatment it gave under the same test conditions a life of 72 hours.
What we claim is:
1. In the processing of nickel-chromium base alloys containing a hardening element and capable of being hardened by precipitation heat treatment, the step of subjecting the alloy to a twostage heat treatment by first heating it during several hours at 650 to 895 C. and thereafter subjecting it during 8 to 30 hours to soaking at 1020 to 1100 C., then cooling and finally ageing at 650 to 850 C.
2. The process of claim 1 in which the preliminary heat treatment is carried through 5 to 30 hours.
3. The process of claim 1 in which the preliminary heat treatment is carried through 5 to 30 hours and the temperature is lowered during the latter part of the preliminary treatment.
4. The process of claim 1, in which the alloy is cooled between the preliminary and the normal heat treatment.
5. The process of claim 1, in which titanium is the hardening element.
6. The process of claim 1, in which titanium and iron are the hardening elements.
7. The process of claim 1 as applied to a nickelchromium alloy containing substantially 80 per cent nickel, 20 per cent chromium and small percentages of titanium and iron.
8. The process of claim 1, as applied to a nickelchromium alloy containing 13 to 23 per cent chromium, more than 10 and up to 35 per cent cobalt, 0.01 to 5 per cent titanium and 1 to 9 per cent aluminum, the remainder being nickel.
HAROLD ERNEST GRESHAM. DOUGLAS WILSON HALL.
REFERENCES CITED The following references are of record in the file of this patent:
UNITED STATES PATENTS Number Name Date 1,635,443 Smith et al July 12, 1927 1,762,730 McKeehan June 10, 1930 2,082,041 Williams June 1, 1937 FOREIGN PATENTS Number Country Date 514,593 Great Britain Nov. 13, 1939
Claims (1)
1. IN THE PROCESSING OF NICKEL-CHROMIUM BASE ALLOYS CONTAINING A HARDENING ELEMENT AND CAPABLE OF BEING HARDENED BY PRECIPITATION HEAT TREATMENT, THE STEP OF SUBJECTING THE ALLOY TO A TWOSTAGE THAT TREATMENT BY FIRST HEATING IT DURING SEVERAL HOURS AT 650 TO 895*C. AND THEREAFTER SUBJECTING IT DURING 8 TO 30 HOURS TO SOAKING AT 1020 TO 1100*C., THEN COOLING AND FINALLY AGEING AT 650 TO 850*C.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2497667X | 1946-02-08 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US2497667A true US2497667A (en) | 1950-02-14 |
Family
ID=10908429
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US726441A Expired - Lifetime US2497667A (en) | 1946-02-08 | 1947-02-04 | Heat-treatment of nickel-chromium alloys |
Country Status (1)
| Country | Link |
|---|---|
| US (1) | US2497667A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2628900A (en) * | 1949-11-29 | 1953-02-17 | C O Jelliff Mfg Corp | Ni-cr-mn alloys |
| US2679455A (en) * | 1951-10-06 | 1954-05-25 | Climax Molybdenum Co | Methods for heat-treating molybdenum-base alloys |
| US2691578A (en) * | 1951-04-12 | 1954-10-12 | Allegheny Ludlum Steel | Iron-molybdenum titanium base alloys |
| US2809110A (en) * | 1954-08-05 | 1957-10-08 | Utica Drop Forge & Tool Corp | Alloy for high temperature applications |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1635443A (en) * | 1925-06-17 | 1927-07-12 | Smith Willoughby Statham | Manufacture of cables loaded with alloys of high-magnetic permeability |
| US1762730A (en) * | 1926-10-30 | 1930-06-10 | Bell Telephone Labor Inc | Heat treatment of magnetic materials |
| US2082041A (en) * | 1935-05-08 | 1937-06-01 | Westinghouse Electric & Mfg Co | Process for producing permanent magnets |
| GB514593A (en) * | 1937-06-30 | 1939-11-13 | Seri Holding Sa | Process for improving iron-beryllium alloys |
-
1947
- 1947-02-04 US US726441A patent/US2497667A/en not_active Expired - Lifetime
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1635443A (en) * | 1925-06-17 | 1927-07-12 | Smith Willoughby Statham | Manufacture of cables loaded with alloys of high-magnetic permeability |
| US1762730A (en) * | 1926-10-30 | 1930-06-10 | Bell Telephone Labor Inc | Heat treatment of magnetic materials |
| US2082041A (en) * | 1935-05-08 | 1937-06-01 | Westinghouse Electric & Mfg Co | Process for producing permanent magnets |
| GB514593A (en) * | 1937-06-30 | 1939-11-13 | Seri Holding Sa | Process for improving iron-beryllium alloys |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2628900A (en) * | 1949-11-29 | 1953-02-17 | C O Jelliff Mfg Corp | Ni-cr-mn alloys |
| US2691578A (en) * | 1951-04-12 | 1954-10-12 | Allegheny Ludlum Steel | Iron-molybdenum titanium base alloys |
| US2679455A (en) * | 1951-10-06 | 1954-05-25 | Climax Molybdenum Co | Methods for heat-treating molybdenum-base alloys |
| US2809110A (en) * | 1954-08-05 | 1957-10-08 | Utica Drop Forge & Tool Corp | Alloy for high temperature applications |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US2706680A (en) | Aluminum base alloy | |
| US20220154311A1 (en) | Ni-BASED SUPERALLOY AND METHOD FOR MANUFACTURING Ni-BASED SUPERALLOY | |
| US2248185A (en) | Heat treatment of aluminum base alloys | |
| US3146136A (en) | Method of heat treating nickel base alloys | |
| US2515185A (en) | Age hardenable nickel alloy | |
| JP2786443B2 (en) | Method of forming fatigue crack-resistant nickel-base superalloy and formed product | |
| US2459492A (en) | Aluminum copper alloy | |
| US2497667A (en) | Heat-treatment of nickel-chromium alloys | |
| JPH09170016A (en) | Production of high-temperature-stable object made of in706 type iron/nickel super alloy | |
| US2766156A (en) | Heat-treatment of nickel-chromiumcobalt alloys | |
| US2275188A (en) | Double aged copper base alloys | |
| US2486576A (en) | Heat-treatment of cobalt base alloys and products | |
| CN107130195A (en) | A kind of 2A70 aluminum alloy forge pieces Technology for Heating Processing | |
| US3145124A (en) | Heat treatment of nickel chromiumcobalt alloys | |
| JP2659373B2 (en) | Method of manufacturing high-temperature bolt material | |
| JPH1025557A (en) | Method for heat treating nickel base superalloy | |
| US2301759A (en) | Aluminum alloy rivet | |
| US2945758A (en) | Nickel base alloys | |
| US3372068A (en) | Heat treatment for improving proof stress of nickel-chromium-cobalt alloys | |
| US2357190A (en) | Copper base alloys | |
| US3248213A (en) | Nickel-chromium alloys | |
| US3420716A (en) | Method of fabricating and heat-treating precipitation-hardenable nickel-base alloy | |
| JPH04218630A (en) | High-strength, high-thermal-conductivity copper alloy for plastic molds and its manufacturing method | |
| US5417782A (en) | Heat treatment process for a NI-based superalloy | |
| US2022686A (en) | Aluminum alloy casting and method of making the same |