CA1135924A - Process for enhancing the mechanical properties of oxide dispersion strengthened materials - Google Patents
Process for enhancing the mechanical properties of oxide dispersion strengthened materialsInfo
- Publication number
- CA1135924A CA1135924A CA000326036A CA326036A CA1135924A CA 1135924 A CA1135924 A CA 1135924A CA 000326036 A CA000326036 A CA 000326036A CA 326036 A CA326036 A CA 326036A CA 1135924 A CA1135924 A CA 1135924A
- Authority
- CA
- Canada
- Prior art keywords
- oxide dispersion
- dispersion strengthened
- mechanical properties
- enhancing
- working
- 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
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/24—After-treatment of workpieces or articles
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/10—Alloys containing non-metals
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C32/00—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ
- C22C32/001—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ with only oxides
- C22C32/0015—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ with only oxides with only single oxides as main non-metallic constituents
- C22C32/0026—Matrix based on Ni, Co, Cr or alloys thereof
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Powder Metallurgy (AREA)
- Manufacture Of Metal Powder And Suspensions Thereof (AREA)
- Manufacture Of Alloys Or Alloy Compounds (AREA)
Abstract
PROCESS FOR ENHANCING THE MECHANICAL PROPERTIES
OF OXIDE DISPERSION STRENGTHENED MATERIALS
ABSTRACT OF THE DISCLOSURE
A process for producing oxide dispersion strengthened material having enhanced mechanical properties. The process includes the steps of consolidating oxide dispersion strengthened powder into a solid mass, working said mass into an elongated body and directionally recrystallizing the body in a direction transverse to the direction of elongation.
OF OXIDE DISPERSION STRENGTHENED MATERIALS
ABSTRACT OF THE DISCLOSURE
A process for producing oxide dispersion strengthened material having enhanced mechanical properties. The process includes the steps of consolidating oxide dispersion strengthened powder into a solid mass, working said mass into an elongated body and directionally recrystallizing the body in a direction transverse to the direction of elongation.
Description
~ .
~3~2~ 1038 1 PROCESS FOR ENHANCING THE ME(HANICAL PROPERTIES
~F OXIDE DISPERSION STRENGTHENED MATERIALS
ABSTRACT O~ THE DISCLOSURE
A process for producing oxide dispersion strengthened material having enhanced mechanical properties. The process S includes the steps of consolidating oxide dispersion strengthened powder into a solid mass, working said mass into an elongated body and directionally recrystallizing the body in a direction transverse to the direction of elongation.
The present invention relates to a process for enhancing the ~echanical properties of oxide dispersion strengthened materials.
Oxide dispersion strengthened materials are powder ~etallurgical products characterized by small highly stable oxide particles dispersed within a metallic matrix. The dispersed particles block dislocation movement thereby imparting~high elevated temperature strength to the material.
Numerous processes for producing such materials are disclosed ~ in the prior art. A particular process is disclosed irl United States Patent No. 4,010,024, issued March lr 1977. ~-~
To attain desirable stress rupture and other high ;
temperature properties, it is necessary to recrystallize oxide dispersion strengthened materials to a relatively coarse grain size. Those skilled in the art are aware of the factors which effect the size of the recrystallized grainsO They include matrix composition, interparticle spacing and distribution of -1- ' ~ ' 1 the oxide particles, working cemperatures, percent reduction and recrystallization temperature cycle.
Those skilled in the art are also aware of the fact that mechanical properties are particularly good in the direction elongated grains are pointing. For this reason, they have taken ~easures to recrystallize oxide dispersion strengthened materials in the direction of working; i.e., the longitudinal direction. By so doing, they have enhanced the mechanical properties of the material in the longitudinal direction, without materially effecting those in the transverse direction. As longitudinal properties are generally superior to transverse properties, they have further improved properties in the better of these two directions through directional recrystallization in lieu of isothermal recrystallization. A
lS paper describing directional recrystallization is entitled, "Manufacturing Methods For Directional Recrystalliztion Process". It was prepared under United States Air Force Contract No. F33615-72-C-1127. The authors are P. G. Bailey, R. E. Kutchera and D. B. Arnold.
Prior to the present invention, little thought had been given to transverse properties. Now through the present invention, there is provided a process for significantly i~proving transverse properties, without ~aterially effecting longitudinal properties. Transverse properties are enhanced by recrystallizing in a direction transverse to working.
Those skilled in the art did not realize that oxide dispersion strengthened ~aterials could be directionally recrystallized in this direction. Hence, the present invention provides a ~ i~L;3r~i9;~9~
. ' ~
;` 1 most significant advance to the state of the art. Many applications for oxide dispersion strengthened materials;
e.g., turbine vanes, require good mechanical properties in more than one direction.
; 5 It is accordingly an object of the present invention to provide oxide dispersion strengthened material having a desirable combination of mechanical properties in two directions.
In accordance with the present invention oxide dispersion strengthened material is subjected to the conventional steps of consolidation and working; and to the improvement of directionally recrystallizing said material in a direction transverse to the direction of working. Specific processing as to the conventional steps is not critical and can be in accordance with that specified in any number of publications including heretofore referred to Patent No. 4,010,024.
Directional recrystallization is described in detail in the heretofore referred to paper entitled, "Manufacturing Methods For Directional Recrystallization Process". Directional recrystallization is basically a process wherein a temperature differential is imposed along the direction grain growth is desired. Although there is reason to believe that any number of oxide dispersion strengthened alloys can be treated in accordance with the teachings of the present invention, nickel and cobalt base alloys appear to be particularly adaptable thereto.
The following example is illustrative of the invention.
1 Oxide dispersion strengthened powder having the following nominal composition:
Cr Al Y203 Ni 16 5 1 Bal.
. 5 was canned, extruded and hot rolled into stock fro~ which two stress rupture test specimens (A & B) were prepared. Specimen A was isothermally annealed in a box furnace. The temperature was raised from 2200 to 2450F at a rate of 4F per minute and maintained at 2450F for one hour. Specimen B ~-as fed into a salt pot at the rate of 2 inches per hour. The salt pot was ' at a temperature of from 2400 to 2450F. The specimen was fed in a direction transverse to the rolling direction. After the entire specimen was in the salt pot it was held there for one hour.
Specimen A was stress rupture tested at a temperature of 2000F under a stress of 6 ksi. The specimen broke after 15.1 hours. Its elongation was 1.9~ and its reduction in area was 0.6%.
Specimen B was stress rupture tested at a temperature of 2000F under the stresses and for the times reported hereinbelow:
STRESS TIME
(ksi?_ (hours) ~2 5.5 1 6.5 3 7 20*
*specimen broke in threaded portion (that portion which holds specimen in grips) 32~L
~, ';
1 No elongation and reduction in area data is available because ' of where specimen broke. In any event, Specimen B lasted for ; a longer period under a higher stress than did Specimen A.
Specimen B was processed in accordance with the subject invention whereas Specimen A was not. The stress rupture data for Specimen 3 would have been even more impressive had it not been for the freak break in its threaded portion.
It will be apparent to those skilled in the art that the novel principles of the invention disclosed herein in connection with specific examples thereof will suggest various other modifications and applications of the same. It is accordingly desired that in construing the breadth of the appended claims they shall not be limited to the specific examples of the invention described herein.
. . ~ ,
~3~2~ 1038 1 PROCESS FOR ENHANCING THE ME(HANICAL PROPERTIES
~F OXIDE DISPERSION STRENGTHENED MATERIALS
ABSTRACT O~ THE DISCLOSURE
A process for producing oxide dispersion strengthened material having enhanced mechanical properties. The process S includes the steps of consolidating oxide dispersion strengthened powder into a solid mass, working said mass into an elongated body and directionally recrystallizing the body in a direction transverse to the direction of elongation.
The present invention relates to a process for enhancing the ~echanical properties of oxide dispersion strengthened materials.
Oxide dispersion strengthened materials are powder ~etallurgical products characterized by small highly stable oxide particles dispersed within a metallic matrix. The dispersed particles block dislocation movement thereby imparting~high elevated temperature strength to the material.
Numerous processes for producing such materials are disclosed ~ in the prior art. A particular process is disclosed irl United States Patent No. 4,010,024, issued March lr 1977. ~-~
To attain desirable stress rupture and other high ;
temperature properties, it is necessary to recrystallize oxide dispersion strengthened materials to a relatively coarse grain size. Those skilled in the art are aware of the factors which effect the size of the recrystallized grainsO They include matrix composition, interparticle spacing and distribution of -1- ' ~ ' 1 the oxide particles, working cemperatures, percent reduction and recrystallization temperature cycle.
Those skilled in the art are also aware of the fact that mechanical properties are particularly good in the direction elongated grains are pointing. For this reason, they have taken ~easures to recrystallize oxide dispersion strengthened materials in the direction of working; i.e., the longitudinal direction. By so doing, they have enhanced the mechanical properties of the material in the longitudinal direction, without materially effecting those in the transverse direction. As longitudinal properties are generally superior to transverse properties, they have further improved properties in the better of these two directions through directional recrystallization in lieu of isothermal recrystallization. A
lS paper describing directional recrystallization is entitled, "Manufacturing Methods For Directional Recrystalliztion Process". It was prepared under United States Air Force Contract No. F33615-72-C-1127. The authors are P. G. Bailey, R. E. Kutchera and D. B. Arnold.
Prior to the present invention, little thought had been given to transverse properties. Now through the present invention, there is provided a process for significantly i~proving transverse properties, without ~aterially effecting longitudinal properties. Transverse properties are enhanced by recrystallizing in a direction transverse to working.
Those skilled in the art did not realize that oxide dispersion strengthened ~aterials could be directionally recrystallized in this direction. Hence, the present invention provides a ~ i~L;3r~i9;~9~
. ' ~
;` 1 most significant advance to the state of the art. Many applications for oxide dispersion strengthened materials;
e.g., turbine vanes, require good mechanical properties in more than one direction.
; 5 It is accordingly an object of the present invention to provide oxide dispersion strengthened material having a desirable combination of mechanical properties in two directions.
In accordance with the present invention oxide dispersion strengthened material is subjected to the conventional steps of consolidation and working; and to the improvement of directionally recrystallizing said material in a direction transverse to the direction of working. Specific processing as to the conventional steps is not critical and can be in accordance with that specified in any number of publications including heretofore referred to Patent No. 4,010,024.
Directional recrystallization is described in detail in the heretofore referred to paper entitled, "Manufacturing Methods For Directional Recrystallization Process". Directional recrystallization is basically a process wherein a temperature differential is imposed along the direction grain growth is desired. Although there is reason to believe that any number of oxide dispersion strengthened alloys can be treated in accordance with the teachings of the present invention, nickel and cobalt base alloys appear to be particularly adaptable thereto.
The following example is illustrative of the invention.
1 Oxide dispersion strengthened powder having the following nominal composition:
Cr Al Y203 Ni 16 5 1 Bal.
. 5 was canned, extruded and hot rolled into stock fro~ which two stress rupture test specimens (A & B) were prepared. Specimen A was isothermally annealed in a box furnace. The temperature was raised from 2200 to 2450F at a rate of 4F per minute and maintained at 2450F for one hour. Specimen B ~-as fed into a salt pot at the rate of 2 inches per hour. The salt pot was ' at a temperature of from 2400 to 2450F. The specimen was fed in a direction transverse to the rolling direction. After the entire specimen was in the salt pot it was held there for one hour.
Specimen A was stress rupture tested at a temperature of 2000F under a stress of 6 ksi. The specimen broke after 15.1 hours. Its elongation was 1.9~ and its reduction in area was 0.6%.
Specimen B was stress rupture tested at a temperature of 2000F under the stresses and for the times reported hereinbelow:
STRESS TIME
(ksi?_ (hours) ~2 5.5 1 6.5 3 7 20*
*specimen broke in threaded portion (that portion which holds specimen in grips) 32~L
~, ';
1 No elongation and reduction in area data is available because ' of where specimen broke. In any event, Specimen B lasted for ; a longer period under a higher stress than did Specimen A.
Specimen B was processed in accordance with the subject invention whereas Specimen A was not. The stress rupture data for Specimen 3 would have been even more impressive had it not been for the freak break in its threaded portion.
It will be apparent to those skilled in the art that the novel principles of the invention disclosed herein in connection with specific examples thereof will suggest various other modifications and applications of the same. It is accordingly desired that in construing the breadth of the appended claims they shall not be limited to the specific examples of the invention described herein.
. . ~ ,
Claims (3)
1. In a process for producing oxide dispersion strengthened material having enhanced mechanical properties, which process includes the steps of: consolidating oxide dispersion strengthened powder into a solid mass, working said mass into an elongated body and recrystallizing said body; the improvement comprising the step of directionally recrystallizing the crystals of said body in a direction transverse to said direction of elongation.
2. A process according to claim 1, wherein said oxide dispersion strengthened material is an alloy from the group consisting of nickel and cobalt base alloys.
3. A directionally recrystallized oxide dispersion strengthened material having been crystallized in a direction transverse to working and made in accordance with the process of claim 1.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US90266078A | 1978-05-04 | 1978-05-04 | |
| US902,660 | 1978-05-04 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1135924A true CA1135924A (en) | 1982-11-23 |
Family
ID=25416189
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000326036A Expired CA1135924A (en) | 1978-05-04 | 1979-04-20 | Process for enhancing the mechanical properties of oxide dispersion strengthened materials |
Country Status (5)
| Country | Link |
|---|---|
| JP (1) | JPS54146206A (en) |
| CA (1) | CA1135924A (en) |
| DE (1) | DE2917886A1 (en) |
| FR (1) | FR2424966A1 (en) |
| GB (1) | GB2020314B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3262679D1 (en) * | 1981-09-03 | 1985-04-25 | Bbc Brown Boveri & Cie | Process for manufacturing an article from a heat-resisting alloy |
| DE3372989D1 (en) * | 1983-02-01 | 1987-09-17 | Bbc Brown Boveri & Cie | Structural element with a high corrosion and oxidation resistance made from a dispersion-hardened superalloy, and process for its manufacture |
| CH673658A5 (en) * | 1988-02-05 | 1990-03-30 | Asea Brown Boveri | |
| US5372499A (en) * | 1993-08-24 | 1994-12-13 | Daido Tokushuko Kabushiki Kaisha | High-temperature gas blower impeller with vanes made of dispersion-strengthened alloy, gas blower using such impeller, and gas circulating furnace equipped with such gas blower |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA916479A (en) * | 1969-07-11 | 1972-12-12 | A. W. Fustukian David | Dispersion strengthened metals and alloys and process for producing same |
| US3772090A (en) * | 1971-07-22 | 1973-11-13 | Gen Electric | Alloy microstructure control |
| JPS5423647B2 (en) * | 1974-04-25 | 1979-08-15 |
-
1979
- 1979-04-20 CA CA000326036A patent/CA1135924A/en not_active Expired
- 1979-04-27 GB GB7914661A patent/GB2020314B/en not_active Expired
- 1979-05-01 JP JP5398879A patent/JPS54146206A/en active Pending
- 1979-05-03 DE DE19792917886 patent/DE2917886A1/en not_active Ceased
- 1979-05-04 FR FR7911331A patent/FR2424966A1/en not_active Withdrawn
Also Published As
| Publication number | Publication date |
|---|---|
| JPS54146206A (en) | 1979-11-15 |
| GB2020314B (en) | 1982-06-23 |
| DE2917886A1 (en) | 1979-11-15 |
| GB2020314A (en) | 1979-11-14 |
| FR2424966A1 (en) | 1979-11-30 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |