EP1546425A2 - Verfahren zum herstellen eines formkörpers aus sinterstahl - Google Patents
Verfahren zum herstellen eines formkörpers aus sinterstahlInfo
- Publication number
- EP1546425A2 EP1546425A2 EP03798821A EP03798821A EP1546425A2 EP 1546425 A2 EP1546425 A2 EP 1546425A2 EP 03798821 A EP03798821 A EP 03798821A EP 03798821 A EP03798821 A EP 03798821A EP 1546425 A2 EP1546425 A2 EP 1546425A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- boron
- powder
- weight
- master alloy
- iron
- 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
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
- C22C33/0207—Using a mixture of prealloyed powders or a master alloy
-
- 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
- B22F3/10—Sintering only
- B22F3/1035—Liquid phase sintering
-
- 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
- B22F2999/00—Aspects linked to processes or compositions used in powder metallurgy
Definitions
- the invention relates to a method for producing a shaped body from sintered steel, wherein an iron-based sintered powder is mixed with a master alloy powder containing nickel, boron and iron, and the powder mixture is pressed into a shaped body before the shaped body is subjected to conditions of liquid phase sintering with a volume fraction of liquid Phase until 15% is sintered.
- the nickel diffuses into the iron powder at the latest after the first appearance of melt, whereby iron partially dissolves in the liquid phase and existing nickel boride is converted into iron boride, which at least at temperatures above of the iron-boron eutectic in turn reacts with iron to form a liquid phase, so that the liquid phase increasingly surrounds the grains of the iron powder.
- the increase in the liquid phase during sintering causes a reduction in the pores and thus a densification of the sintered steel. Since the amount of liquid phase is largely determined by the iron content in the liquid phase, it has already been proposed (T. Nishida, T. Yamazaki, S. Chida, M.
- Yamamiya Effect of B on the Densification and the Mechanical Properties of Sintered Iron Powder Compacts, J. Japan Inst. Metals, Vol. 54, No. 10 (1990), pp. 1147-1153) to use a master alloy powder of iron, nickel and boron, so that additional iron boride is made available via the master alloy, which brings about an acceleration of the reactions which result in an increase in volume of the liquid phase. Net-like eutectic structures are formed which increase the tensile strength of the sintered steel, but in particular significantly impair the impact resistance.
- the invention is therefore based on the object of designing a method for producing a shaped body from sintered steel of the type described at the outset such that, in particular, the impact strength of the sintered steel can be decisively increased.
- the invention achieves the object in that the boron content of the powder mixture with a boron content of the master alloy powder of less than 10% by weight is between 0.03 and 0.2% by weight, in that the weight ratio between the nickel and boron content of the powder mixture 5 and that the master alloy powder has an average particle size between 10 and 90 microns.
- the combination of these measures can surprisingly prevent the build-up of a continuous eutectic network structure, as is aimed at for extensive compression of the sintered steel.
- the molded body has good values with regard to impact strength, in fact with correspondingly higher tensile strengths due to the greater density, although a certain residual porosity has to be accepted because of the boride regions which are delimited from one another.
- an average fineness of the master alloy powder (average particle size between 10 and 90 ⁇ m) compared to fine powders advantages are obtained with regard to the suppression of a pronounced boride network, because they preferably have coarser pre-alloy powders obtained by gas atomization, have rounded edges, have less tendency to agglomerate and can be mixed more uniformly with the iron-based sinter powder.
- the carbon required for hardening a sintered steel is added in the usual way as graphite.
- the carbon affects the beneficial effect of boron on the sintering process, so it is advisable to limit the carbon content to a value between 0.15 and 0.8% by weight.
- the described effects of the measures according to the invention are not dependent on the composition of the sintered powder based on iron, so that the composition of this sintered powder can be selected according to the respective requirements.
- the master alloy powder is also not limited to a ternary alloy.
- the master alloy powder can additionally contain manganese, chromium, copper, molybdenum, vanadium, titanium, niobium, tungsten, carbon, aluminum and / or at least one element from the group of the lanthanoids.
- a master alloy powder with 67% by weight of nickel, 30% by weight of iron and 3% by weight of boron was used. The average particle size was 40 ⁇ m.
- This master alloy powder was mixed in a weight fraction of 4% with an iron-based sinter powder which had 0.3% by weight of carbon.
- the powder mixture was pressed into a cylindrical blank with a green density of 7.160 g / cm 3 and then sintered at a temperature of 1250 ° C. under a hydrogen atmosphere. After sintering, a density of 7.314 g / cm 3 was measured. The impact strength was measured at 78.24 J / cm 2 .
- a master alloy powder with 63% by weight of nickel, 30% by weight of iron and 7% by weight of boron with an average particle size of 60 ⁇ m was used, namely in an amount of 2% by weight of the total powder mixture.
- the iron-based sinter powder again had a carbon content of 0.3% by weight.
- a green density of 7.068 g / cm 3 and a sintered density of 7.228 g / cm 3 were measured.
- the impact strength was 76.21 J / cm 2 .
- the nickel content in the sintered steel in the first exemplary embodiment was 2.68% by weight and the boron content was 0.12% by weight, which corresponds to a ratio of nickel to boron of approximately 22: 1.
- the proportion of nickel was 1.26% by weight and that of boron 0.14% by weight.
- the ratio of nickel to boron could thus be given as 9: 1.
- the drawing shows the dependency of the impact strength on the boron content in a method according to the invention using two master alloy powders.
- Curve 1 relates to a master alloy powder with 67% by weight of nickel, 30% by weight of iron and 3% by weight of boron, this master alloy powder being mixed in different amounts of the sintered powder.
- the impact strength of the shaped bodies having different boron fractions was measured.
- Curve 1 shows the basic course of the impact strength as a function of the boron content values plotted in% by weight on the abscissa.
- the size of the impact strength is also determined by the composition of the sinter powder, so that only the basic one in the drawing Dependence of the impact strength on the boron content was reproduced, but not certain measured values for the impact strength. It can be seen that the impact strength reaches a maximum in the range of a boron content between 0.13 and 0.15% by weight of the sintered steel, only to drop sharply towards higher boron levels.
- Curve 2 reflects the measured values which result when using a master alloy powder with 63% by weight of nickel, 30% by weight of iron and 7% by weight of boron in accordance with the second exemplary embodiment.
- curves 1 and 2 were determined, only the proportions by weight of the master alloy powder in the powder mixture were changed, but the other parameters were left unchanged. It can be seen from the two curves 1 and 2 that, for the master alloy powder with the higher nickel and low boron content, more favorable conditions with regard to the impact strength of the shaped bodies result in a wide range. It can also be seen from the two curves that the impact strength decreases rapidly with a boron content greater than 0.2% by weight and therefore only a boron content of up to 0.2% by weight brings with it a correspondingly high impact strength.
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)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT0148002A AT411691B (de) | 2002-10-01 | 2002-10-01 | Verfahren zum herstellen eines formkörpers aus sintermetall |
AT14802002 | 2002-10-01 | ||
PCT/AT2003/000292 WO2004031427A2 (de) | 2002-10-01 | 2003-09-30 | Verfahren zum herstellen eines formkörpers aus sinterstahl |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1546425A2 true EP1546425A2 (de) | 2005-06-29 |
EP1546425B1 EP1546425B1 (de) | 2011-01-19 |
Family
ID=27792533
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP03798821A Expired - Lifetime EP1546425B1 (de) | 2002-10-01 | 2003-09-30 | Verfahren zum herstellen eines formkörpers aus sinterstahl |
Country Status (7)
Country | Link |
---|---|
US (1) | US20060165548A1 (de) |
EP (1) | EP1546425B1 (de) |
JP (1) | JP2006501364A (de) |
AT (2) | AT411691B (de) |
AU (1) | AU2003265714A1 (de) |
DE (1) | DE50313424D1 (de) |
WO (1) | WO2004031427A2 (de) |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1077235B (de) * | 1957-10-07 | 1960-03-10 | Deutsche Edelstahlwerke Ag | Verfahren zur Herstellung von legierten Sinterstaehlen |
JPS5884905A (ja) * | 1981-11-13 | 1983-05-21 | N D C Kk | ステンレス鋼粉の多孔質焼結体の製造方法 |
DE4207379A1 (de) * | 1992-03-09 | 1993-09-16 | Asea Brown Boveri | Verfahren und herstellung eines sinterkoerpers aus hochlegiertem stahlpulver |
-
2002
- 2002-10-01 AT AT0148002A patent/AT411691B/de not_active IP Right Cessation
-
2003
- 2003-09-30 JP JP2004540361A patent/JP2006501364A/ja active Pending
- 2003-09-30 WO PCT/AT2003/000292 patent/WO2004031427A2/de active Application Filing
- 2003-09-30 DE DE50313424T patent/DE50313424D1/de not_active Expired - Lifetime
- 2003-09-30 US US10/529,294 patent/US20060165548A1/en not_active Abandoned
- 2003-09-30 EP EP03798821A patent/EP1546425B1/de not_active Expired - Lifetime
- 2003-09-30 AT AT03798821T patent/ATE496149T1/de active
- 2003-09-30 AU AU2003265714A patent/AU2003265714A1/en not_active Abandoned
Non-Patent Citations (1)
Title |
---|
See references of WO2004031427A2 * |
Also Published As
Publication number | Publication date |
---|---|
EP1546425B1 (de) | 2011-01-19 |
WO2004031427A3 (de) | 2004-10-28 |
WO2004031427A2 (de) | 2004-04-15 |
ATE496149T1 (de) | 2011-02-15 |
DE50313424D1 (de) | 2011-03-03 |
AU2003265714A1 (en) | 2004-04-23 |
US20060165548A1 (en) | 2006-07-27 |
AT411691B (de) | 2004-04-26 |
ATA14802002A (de) | 2003-09-15 |
JP2006501364A (ja) | 2006-01-12 |
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