EP1246950A1 - Compacting and sintering steel powder - Google Patents
Compacting and sintering steel powderInfo
- Publication number
- EP1246950A1 EP1246950A1 EP00981941A EP00981941A EP1246950A1 EP 1246950 A1 EP1246950 A1 EP 1246950A1 EP 00981941 A EP00981941 A EP 00981941A EP 00981941 A EP00981941 A EP 00981941A EP 1246950 A1 EP1246950 A1 EP 1246950A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- mpa
- compacting
- sintering
- temperature
- treated
- 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.)
- Granted
Links
- 238000005245 sintering Methods 0.000 title claims abstract description 23
- 239000000843 powder Substances 0.000 title claims abstract description 22
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 13
- 239000010959 steel Substances 0.000 title claims abstract description 13
- 238000000034 method Methods 0.000 claims abstract description 19
- 238000007792 addition Methods 0.000 claims abstract description 15
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 15
- 239000000956 alloy Substances 0.000 claims abstract description 15
- 239000000203 mixture Substances 0.000 claims abstract description 12
- 238000003825 pressing Methods 0.000 claims abstract description 12
- 239000012467 final product Substances 0.000 claims abstract description 8
- 229910021529 ammonia Inorganic materials 0.000 claims abstract description 6
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 239000000047 product Substances 0.000 description 14
- 239000002245 particle Substances 0.000 description 9
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 7
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 7
- 239000000463 material Substances 0.000 description 5
- 238000000137 annealing Methods 0.000 description 4
- 229910052802 copper Inorganic materials 0.000 description 4
- 239000010949 copper Substances 0.000 description 4
- 229910052759 nickel Inorganic materials 0.000 description 4
- 229910001369 Brass Inorganic materials 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 3
- 239000010951 brass Substances 0.000 description 3
- 230000003993 interaction Effects 0.000 description 3
- 239000011159 matrix material Substances 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 238000001953 recrystallisation Methods 0.000 description 2
- 229910000859 α-Fe Inorganic materials 0.000 description 2
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- JZQOJFLIJNRDHK-CMDGGOBGSA-N alpha-irone Chemical compound CC1CC=C(C)C(\C=C\C(C)=O)C1(C)C JZQOJFLIJNRDHK-CMDGGOBGSA-N 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000007596 consolidation process Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 239000011265 semifinished product Substances 0.000 description 1
- 239000011343 solid material Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/02—Making ferrous alloys by powder metallurgy
-
- 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
- B22F3/12—Both compacting and sintering
- B22F3/16—Both compacting and sintering in successive or repeated steps
-
- 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
- B22F2998/00—Supplementary information concerning processes or compositions relating to powder metallurgy
- B22F2998/10—Processes characterised by the sequence of their steps
Definitions
- the invention concerns a method of getting shaped elements by pressing, sintering and cold-compacting of powder mixtures of steel with alloy additions, being used for production of machine parts, e.g. gears, bearings and others of high wear resistance and surface pressures.
- a product from powder alloy steel is twice pressed and twice sintered at temperatures 800 °C and 1 150 °C.
- Parts obtained by this method have insufficient strength parameters, in particular low bending strength.
- Parts obtained by this method are characterized by low strength parameters, in particular low compressibility of ring products at radial action of a force.
- Plastic forming of a presintered semi-final product follows forming and shift of dislocation through crystal lattice along definite surfaces and dislocation forces.
- Plasticity of a sintered product, particularly density of a final product increases if, during first sintering, there is elimination of forming of factors inhibiting motion of dislocation shift, such as forming: a hard solution, fine-grained particles, secondary phases, etc.
- the first sintering should be conducted in conditions of recrystallization annealing at temperature A c ⁇ .
- Structure of die stampings from constructional steel powders is a mixture of separate components (if a matrix is iron powder with graphite additions) or an alloy ferrite (if a matrix is iron powder with alloy additions).
- Optimum temperature of presintering should be from 720 °C to 730 °C. At this temperature, solubility of carbon in ⁇ -iron is about 0.03%, and after sintering in state of recrystallization annealing of a product, is characterized by low hardness coefficients as a result of lack of such consolidation factors as secondary phases, particle dispersability, etc.
- interparticle contact points make a system of glide planes, which is used as a system of glide planes inside grains and particles at ambient (room) temperature. Gliding along interparticle connections takes place under outside presssure, what has an essential importance to the process of plastic strain.
- Similar model can be called a model for staresuper dislocation" because it is based on an effective gliding along particle boundaries as a result of particular shift kind ofcrowdedspace contact lattice". This leads to additional, significant increase of sintered semi-final product palsticity, because it is known that metal material plasticity increases significantly if an additional mechanism of plastic strain, besides gliding at dislocation shift, is introduced into a process of plastic metal flow.
- the essence of the invention concerning a method of getting shaped elements by pressing, sintering and compacting of powder mixtures of steel with alloy additions, consists in that a preformed element is treated with presintering. preferably in dissociated-ammonia atmosphere at temperature 700 - 750 °C, preferably 720 - 730 °C, during 20 - 40 min, preferably 30 min, and first compacting under pressure 700 - 800 MPa, preferably 750 MPa, and then second compacting with simultaneous calibration under pressure 900 - 1000 MPa, preferably 950 MPa, then final sintering at temperature 1100 - 1200 °C, preferably
- Preformed semi-final product from powder mixtures of steel with alloy additions of brass, nickel, copper, and others is treated with presintering in dissociated-ammonia atmosphere at temperature 725 ⁇ 5 °C during 30 min, and treated with compacting under pressure 750 MPa. Then it is treated with second compacting under pressure 950 MPa and calibration, then final sintering at temperature 1 130 °C during 45 min.
- Preformed semi-final product from powder mixtures of steel with alloy additions of brass, nickel, copper, and others is treated with presintering in dissociated-ammonia atmosphere at temperature 740 ⁇ 5 °C during 25 min, and first compacting under pressure 780 MPa. So prepared element is treated with second compacting under pressure 980 MPa and calibration, then final sintering at temperature 1 180 °C during 40 min.
- Preformed semi-final product from powder mixtures of steel with alloy additions of brass, nickel, copper, and others is treated with presintering in dissociated-ammonia atmosphere at temperature 710 ⁇ 5 °C during 35 min, and first compacting under pressure 710 MPa, then it is treated with second compacting under pressure 910 MPa and calibration, then final sintering at temperature 1 100 °C during 50 min.
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)
- Processing Of Stones Or Stones Resemblance Materials (AREA)
- Mechanical Treatment Of Semiconductor (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PL33763799 | 1999-12-31 | ||
PL337637A PL191806B1 (en) | 1999-12-31 | 1999-12-31 | Method of obtaining shaped workpieces |
PCT/PL2000/000098 WO2001049891A1 (en) | 1999-12-31 | 2000-12-14 | Compacting and sintering steel powder |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1246950A1 true EP1246950A1 (en) | 2002-10-09 |
EP1246950B1 EP1246950B1 (en) | 2003-07-23 |
Family
ID=20075799
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP00981941A Expired - Lifetime EP1246950B1 (en) | 1999-12-31 | 2000-12-14 | Compacting and sintering steel powder |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP1246950B1 (en) |
AT (1) | ATE245715T1 (en) |
DE (1) | DE60004106T2 (en) |
PL (1) | PL191806B1 (en) |
WO (1) | WO2001049891A1 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102004002714B3 (en) * | 2004-01-19 | 2005-05-19 | SCHWäBISCHE HüTTENWERKE GMBH | To produce sintered components, of light metal alloys, the powder is compressed into a green compact to be give a low temperature sintering followed by further compression and high temperature sintering |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2648519B2 (en) * | 1989-10-03 | 1997-09-03 | 日立粉末冶金株式会社 | Method of manufacturing synchronizer hub |
US5080712B1 (en) * | 1990-05-16 | 1996-10-29 | Hoeganaes Corp | Optimized double press-double sinter powder metallurgy method |
EP0934134A4 (en) * | 1996-05-13 | 2003-07-30 | Gkn Sinter Metals Inc | Method for preparing high performance ferrous materials |
-
1999
- 1999-12-31 PL PL337637A patent/PL191806B1/en unknown
-
2000
- 2000-12-14 DE DE60004106T patent/DE60004106T2/en not_active Expired - Lifetime
- 2000-12-14 AT AT00981941T patent/ATE245715T1/en not_active IP Right Cessation
- 2000-12-14 WO PCT/PL2000/000098 patent/WO2001049891A1/en active IP Right Grant
- 2000-12-14 EP EP00981941A patent/EP1246950B1/en not_active Expired - Lifetime
Non-Patent Citations (1)
Title |
---|
See references of WO0149891A1 * |
Also Published As
Publication number | Publication date |
---|---|
DE60004106T2 (en) | 2004-04-22 |
PL191806B1 (en) | 2006-07-31 |
PL337637A1 (en) | 2001-07-02 |
ATE245715T1 (en) | 2003-08-15 |
WO2001049891A1 (en) | 2001-07-12 |
EP1246950B1 (en) | 2003-07-23 |
DE60004106D1 (en) | 2003-08-28 |
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