WO2020043718A1 - Modified high speed steel particle, powder metallurgy method using the same, and sintered part obtained therefrom - Google Patents
Modified high speed steel particle, powder metallurgy method using the same, and sintered part obtained therefrom Download PDFInfo
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- WO2020043718A1 WO2020043718A1 PCT/EP2019/072829 EP2019072829W WO2020043718A1 WO 2020043718 A1 WO2020043718 A1 WO 2020043718A1 EP 2019072829 W EP2019072829 W EP 2019072829W WO 2020043718 A1 WO2020043718 A1 WO 2020043718A1
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/005—Heat treatment of ferrous alloys containing Mn
-
- 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
- C22C33/0221—Using a mixture of prealloyed powders or a master alloy comprising S or a sulfur compound
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- 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
- C22C33/0257—Making ferrous alloys by powder metallurgy characterised by the range of the alloying elements
- C22C33/0278—Making ferrous alloys by powder metallurgy characterised by the range of the alloying elements with at least one alloying element having a minimum content above 5%
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/20—Ferrous alloys, e.g. steel alloys containing chromium with copper
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/24—Ferrous alloys, e.g. steel alloys containing chromium with vanadium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/38—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of manganese
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/60—Ferrous alloys, e.g. steel alloys containing lead, selenium, tellurium, or antimony, or more than 0.04% by weight of sulfur
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- 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
- B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
- B22F1/05—Metallic powder characterised by the size or surface area of the particles
- B22F1/052—Metallic powder characterised by the size or surface area of the particles characterised by a mixture of particles of different sizes or by the particle size distribution
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- 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
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- 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
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- 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
- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/02—Making metallic powder or suspensions thereof using physical processes
- B22F9/06—Making metallic powder or suspensions thereof using physical processes starting from liquid material
- B22F9/08—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying
- B22F9/082—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying atomising using a fluid
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/004—Dispersions; Precipitations
Definitions
- the present invention relates to particles made from a High Speed Steel (HSS) that is modified to contain dispersed precipitations of manganese sulfide (MHSS), and to a Powder Metallurgy (PM) method using the same. It also relates to a part produced by the PM process using the modified HSS particles.
- HSS High Speed Steel
- PM Powder Metallurgy
- High Speed Steel is a highly alloyed steel and is conventionally used in a variety of applications due to its high hardness at high temperature, flexural strength and durability.
- a typical application of HSS alloys is cutting equipment for machining apparatuses or valve seat inserts (VSI) for combustion engines.
- VSI valve seat inserts
- WO 93/19875 describes a method for the manufacture of a sintered ferrous-based material that comprises the steps of making a mixture of a ferrous-based powder, the mixture including a compound containing at least one metal from the group comprising manganese and the alkaline-earth series of metals; at least one sulphur donating material; pressing the powder mixture and sintering the pressed mixture so as to cause the formation by reaction during sintering of at least one stable metal sulfide within the sintered material. Materials and articles made by the method are also described.
- the physical properties of the High Speed Steel, in particular strength, are not impaired at all as compared to a High Speed Steel not including the means of the present invention.
- the part obtained from the PM should be suitable for applications that require final machining prior to use yet should possess properties that withstand harsh conditions of use, such as present in a combustion engine.
- MnS is known to cause serious eye irritation, skin irritation for the human exposed to it (https://echa.europa.eu/registration- dossier/-/registered-dossier/10223/2/1. It is hence a further object of the present invention to provide a material that has improved machinability with a reduced health risk.
- the present inventors found that forming a melt of a HSS and 1) Mn or a Mn- containing compound and 2) S or an S-containing compound, followed by an atomization process to form particles, is able to modify an HSS particle to contain dispersed sulfide precipitations containing mainly manganese sulfide.
- the amount of Mn and S are chosen such that the weight ratio of Mn to S (Mn/S), in wt-% of the total weight of the particle, is in the range of 8.0 - 1.0, preferably 5.5 to 3.0, such as from 5.5 to 3.5 or from 5.5 to 4.1 .
- manufacturing method using the particles has improved machinability as compared to a an article prepared from a corresponding non-modified HSS to which 1 ) Mn or a Mn-containing compound and 2) S or an S-containing compound were not added.
- the physical properties of the article obtained from the modified HSS particles are not or not significantly impaired as compared to an article that is prepared from corresponding non-modified HSS particles.
- the material of present invention does not contain free MnS particles therefore MnS dusting and abovementioned hazards are dramatically reduced.
- a High Speed Steel (HSS) particle that is modified to contain dispersed precipitations of manganese sulfide, wherein the weight ratio of Mn to S (Mn/S), in wt-% of the total weight of the particle, is in the range of 8.0 - 1.0, preferably 5.5 to 3.0, such as from 5.5 to 3.5 or from 5.5 to 4.1.
- High Speed Steel particle that is modified to contain dispersed
- composition consisting of, in weight%,
- HSS particle that is modified to contain dispersed precipitations of manganese sulfide according to any one of items 1 to 3, wherein the total amount of Mn and S (Mn+S) is from 0.10 - 3.80 % by weight, preferably from 0.10 -3.00% by weight, further preferably from 0.20 - 2.50% by weight, such as from 0.30- 2.00 % by weight.
- Method for forming a powder metallurgy product which comprises the steps of: a . Providing a multitude of particles as defined in any one of items 1 to 8; b . Compacting a composition comprising the particles to form a green part; c . Sintering the green part, and
- step c optionally heat-treating the part obtained from step c;
- forming particles from the melt preferably by water atomization or gas atomization.
- a.3. optionally annealing the particles in vacuum, inert or reducing atmosphere.
- Sintered part obtainable from the particles as defined by in any one of items 1 to 9 or by the process as defined in any one of items 9 and 10.
- Sintered part according to item 1 1 which is a part for a combustion engine, preferably a valve seat insert.
- any given range referred to by a lower and upper limit such as for example“2 to 5” or“between 2 and 5”, includes the lower and the upper value, as any value in between. Values greater than the lower limit or lower than the upper limit are explicitly included. The term is thus to be understood as abbreviation for the expression“[lower limit] or greater, but [upper limit] or lower”.
- the lower and upper limits can be freely combined.
- the phrase“5 to 10, preferably 6 to 8" also includes the ranges of 5 to 8 and 6 to 10.
- the term“about” means that the amount or value in question may be the specific value designated or some other value in its neighborhood, generally within a range of ⁇ 5% of the indicated value. As such, for instance the phrase“about 100” denotes a range of 100 ⁇ 5, and the phrase“about 60” denotes a range of 60 ⁇ 3.
- composition comprising certain components thus may comprise other components besides the ones listed.
- the term also includes the more restrictive meanings“consisting of and“consisting essentially of.
- Consisting essentially of allows for the presence of up to and including 10 weight%, preferably up to and including 5% of materials other than those listed for the respective composition, which other materials may also be completely absent. In the latter case, the composition“consists of the recited components.
- High Speed Steel denotes an alloy as defined by its composition in Table 1 of ASTM 600-92a(2010), not including the Intermediate High Speed Steels M50 and M52, or an alloy having a composition as disclosed in W02009/040369, which is hereby incorporated in its entirety be reference.
- This alloy may be in any form, e.g.
- a pre-alloyed water atomized iron-based powder in the form of a pre-alloyed water atomized iron-based powder, and it has a composition comprising 10 to less than 18% by weight of Cr, 0.5 - 5 % by weight of at least one of Mo, W, V, and Nb, 0.5 - 2 % by weight, preferably 0.7 - 2 % by weight, more preferably 1 - 2 % by weight of C, optionally 0 - 2 % by weight of Si, the remainder being Fe.
- the alloy according to this definition is not limited in structure, yet it may comprise a matrix containing less than 10% by weight of Cr, as well as large chromium carbides having an average size of 8 - 45 pm, preferably 8 - 30 pm, and smaller and harder chromium carbides having an average size of less than 8 pm.
- the large chromium carbides are more preferably present in an amount of 10 - 30% by volume, and the smaller and harder chromium carbides are preferably present in an amount of 3 - 10% by volume.
- a Modified High Speed Steel refers to an alloy that satisfies the compositions as defined in Table 1 of ASTM 600-92a(2010) or defined above with reference to W02009/040369 except for the amounts of manganese (Mn) and sulfur (S), which are higher for a modified High Speed Steel as compared to the corresponding High Speed Steel.
- the present invention relates to a High Speed Steel (HSS) particle that is modified to contain dispersed precipitations of manganese sulfide.
- HSS High Speed Steel
- MHSS s Modified High Speed Steel
- Such a particle can be obtained by the method of the present invention that will be described later, and is generally obtainable by adding Mn or an Mn-containing compound and S or an S-containing compound to a melt of HSS as defined in ASTM 600-92a(2010) or an alloy as disclosed above with reference to
- Mn-containing compound and S-containing compound can be replaced by a compound containing both Mn and S, such as MnS. It is however necessary to form a homogeneous melt of the HSS and the material(s) that are added in order to increase the Mn and S content as compared to the HSS on which the MHSS is based, as adding MnS to HSS particles is unable to form the structure of the particles of the present invention containing dispersed precipitations of manganese sulfide.
- the HSS on which the MHSS is based is not particular limited, but is in one embodiment preferably a M-type HSS, such as M2 (regular or high C), M3 (class 1 or class 2) or M35.
- M2 regular or high C
- M3 class 1 or class 2
- M35 M35
- Other HSS on which the MHSS may be bases include OB1 , available from Hoganas AB, Sweden, and T15.
- the MHSS consists of, in weight%,
- V 1.75 - 4.50, preferably 3.00-3.80
- the unavoidable impurities include any element not listed above, such as P or Si.
- the lower limit of Mn can also be 0.50, and/or the lower limit of S can also be 0.100.
- the MHSS particle of the present invention has precipitations of manganese sulfide. This, however, does not mean that elements other than Mn and S are completely absent in these precipitations. If a precipitate is analyzed by e.g. SEM / EDS mapping on 50 or more precipitations (point analysis).
- the amount of Mn is 40 at.% or more, in a normalized connotation wherein the amounts of the elements Si, S, V Cr, Mn, Fe, Mo and W (insofar present) form 100 at.%.
- Si silicon
- S vanadium
- Mn manganese
- Mo manganese
- W insofar present
- the size of the precipitations is not particularly limited, but is typically not too large in order not to disturb the structure of the HSS too much and to provide dispersed regions that are believed to improve machinability.
- the longest axis of all precipitates, as observed by SEM on the surface of the particles, is typically 10 pm or less, such as 1 to 8 pm and typically from 1 to 5 or from 2 to 5 pm.
- the total amount of Mn and S (Mn+S) is generally from 0.10 - 3.80 % by weight, preferably from 0.10 -3.00% by weight, further preferably from 0.20 - 2.50% by weight, such as from 0.30- 2.00 % by weight, relative to the weight of the MHSS particle.
- the lower limit in each of these ranges can however also be 0.50, 0.60, 0.70, 0.80 or 0.90% by weight or more, such as 0.95% by weight or more.
- the weight ratio of Mn to S i.e. weight of Mn / weight of S, in wt-% of the total weight of the MHSS particle
- the first reason is that this ratio is required to obtain a proper structure. If the relative amount of Mn (i.e. the weight ratio of Mn to S) is too high, excess Mn may lead to distortions. If the ratio is too low, excess S may form sulfide layers at grain boundaries, which may potentially lead to an impairment of physical properties, such as rupture strength of an article obtained by a PM process using the MHSS particles.
- the present inventors have surprisingly found that adjusting the ratio of Mn and S allows avoiding a substantial loss of sulfur from the melt, as would generally be expected due to the relatively high vapor pressure of sulfur at elevated temperatures.
- the sulfur immediately reacts with (or associates with) the manganese. Thereby the amount of elementary sulfur that could get lost due to its high vapor pressure is thus minimized. This is turn avoids or minimizes the need for maintenance work for removing sublimed sulfur, lowers the environmental burden and also makes the MHSS cheaper and easier to produce.
- the weight ratio of Mn to S (Mn/S), in wt-% of the total weight of the particle is in the range of 8.0 - 1.0, more preferably 5.5 to 3.0, such as from 5.5 to 3.5 or from 5.5 to 4.1.
- the Mn content in HSS is mostly 0.15 - 0.40% by weight or less, depending on the type of HSS as listed in Table 1 of ASTM A600-92a (2010).
- the Mn content is higher than that, and is in one embodiment 3.00% by weight or less, preferably 2.00 % by weight or less, but 0.41 % by weight or more, such as 0.45% by weight or more, or even 0.50% by weight or more or 0.75% by weight or more.
- the amount of S is also higher as in corresponding HSS, wherein it is limited to 0.03% by weight.
- the amount of S is 0.05 % by weight or higher, such as 0.10% by weight or higher or 0.15 % by weight or higher.
- the upper limit is not particularly limited, but may be 0.50% by weight or lower, such as 0.30% by weight or lower or 0.25% by weight or lower.
- HSS alloys contain more than one of Mo, W, V and Cr in different amounts, depending on the type of HSS.
- the MHSS particle contains 4.00% by weight or more of at least one element selected from Mo, W, V and Cr, and in one embodiment contains 4.00% by weight or more of two or more of these elements.
- the MHSS particle may contain 4.00 % by weight or more of each of Mo, W and Cr.
- the MHSS particle of the present invention can be used in a PM manufacturing process, and to this end, a multitude of MHSS particles are needed.
- 98% by weight or more of the particles have an particle size of 0 to 300 pm, wherein the amount of particles bigger than 300 pm is 2% by weight or less, as determined by sieve analysis according to IS04497:1983.
- the amount of particles bigger than 300 mih can also be 1 % by weight or less, or such particles can be completely absent.
- 98% by weight or more of the particles have a particle size of 0 to 200 pm and the amount of particles bigger than 200 pm is 2% by weight or less.
- the amount of particles bigger than 200 pm can also be 1 % by weight or less, or such particles can be completely absent.
- the MHSS particles of the present invention can be formed by providing a melt of the raw components, typically a commercially available HSS, S and Mn (or compounds comprising S and Mn), followed by atomization from the melt by a conventional technique.
- the raw components may be HSS scrap, but could also involve virgin raw materials such as Fe, FeCr, FeV etc.
- the atomization can be effected by e.g. gas atomization or water atomization, with water atomization being preferred.
- the MHSS particles can be annealed in vacuum or protective atmosphere in order to reduce hardness and improve compressibility. Such an annealing can be conducted under conditions that are generally known, such as at 900-1 100 °C for 15-72 hours.
- the MHSS particles are suitable for use in PM manufacturing process. They possess suitable powder compressibility and are able to provide a low dimensional change during sintering.
- the method for forming a powder metallurgy product of the present invention comprises the steps: a . Providing a multitude of MHSS particles as described above;
- step c optionally heat-treating the part obtained from step c;
- step e optionally machining the sintered part obtained from step c. or from step d.
- steps are conventional in the field of PM manufacturing methods. Any suitable conventional method can be employed in the present invention.
- the composition referred to in step b. may consist of the MHSS particles only, but may optionally also contain other metal or alloy components, such us graphite powder (up to 1 %), iron powder, low alloyed iron powder, Cu powder, hard additives, such as Tribaloy, and may also contain other additives such as a glidant (e.g. amide wax) in an amount of e.g. 1 % by weight.
- the MHSS particles of the present invention typically form 90% by weight or more, such as 95% by weight or more or 99% by weight or more of the composition of step b.
- Sintering step“c” can optionally be carried out with the presence of an Cu based alloy.
- Cu based alloy is placed in contact with the green part in the sintering furnace. At sintering temperature the infiltrating alloy is melted. The liquid Cu alloy will penetrate into the pores by capillary forces and form a nearly fully dense composite material. Infiltrating alloys typically contain at least 95% Cu and optionally further elements for improving infiltration behavior, as is well known in the art. Cu infiltration increases the hardness and strength of the final PM component and improves the thermal conductivity.
- the sintered part of the present invention is a part that is obtainable by using a composition comprising or consisting of the MHSS particles as described above in a PM manufacturing process, e.g. the process described above.
- the sintered part of the present invention obtainable by using the composition comprising or consisting of the MHSS particles as described above has improved machinability as compared to a sintered part made from the corresponding HSS under the same conditions. Surprisingly, the sintered part of the present invention has still very satisfactory properties. In particular, the sintered part may still have the same hardness and strength.
- the present invention is particularly suitable for providing sintered parts (parts produced by a PM manufacturing method) for use under harsh conditions.
- the sintered part of the present invention is thus in one embodiment a part for a combustion engine, such as a valve seat insert (VSI) or valve guide.
- VSI valve seat insert
- MHSS particles with the following compositions were prepared (balance: Fe and unavoidable impurities):
- Melts of the materials were prepared by adding Mn and S to virgin materials, including Fe and alloy thereof such as ferrochromium, ferrovanadium,
- the vacuum annealed powders were investigated by SEM. It was observed that precipitates of manganese sulfide having a longest axis of 2 - 5 pm had been formed.
- the compacted parts (green parts) were then sintered at 1120°C for 20 minutes in nitrogen with Thereafter, the particles were sub-zero cooled dipping in liquid nitrogen for 20 minutes in order to transform retained austenite.
- the machinability of the sintered parts was evaluated by using ring shaped samples of 55*45*15 mm under the following cutting parameters:
- Sandvik CNGA120404T010208B material - CBN, radius of cutting tip: 0.4mm Cutting Depth: 0.4 mm
- the material of Ref2 achieved cutting distance 2834 m until the tool tip was broken.
- the MHSS material of Example 2 could be machined up to 6720 m. Tool tip wear was about 0.18 mm.
- the machinability was evaluated in the same manner as in Examples 1 and 2.
- the machinability was at the same level for Comp. Ex 2 as for Example 2.
- Example 2 and Comp. Ex. 1 provided a tool life of at least 3 times as Ref 2.
- admixing of MnS in Comparative Example 1 resulted in a considerable reduction of material strength, which was not observed for the material of Example 2.
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Abstract
Description
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Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US17/269,164 US20210262050A1 (en) | 2018-08-31 | 2018-08-27 | Modified high speed steel particle, powder metallurgy method using the same, and sintered part obtained therefrom |
KR1020217008614A KR20210038691A (en) | 2018-08-31 | 2019-08-27 | Modified high speed steel particles, powder metallurgy method using the same, and sintered parts obtained therefrom |
EP19756210.1A EP3844315A1 (en) | 2018-08-31 | 2019-08-27 | Modified high speed steel particle, powder metallurgy method using the same, and sintered part obtained therefrom |
JP2021510771A JP2021535282A (en) | 2018-08-31 | 2019-08-27 | Modified high speed steel particles, powder metallurgy methods using them, and sintered parts obtained from them. |
BR112021002876-5A BR112021002876A2 (en) | 2018-08-31 | 2019-08-27 | modified high speed steel particle, powder metallurgy method using the same, and sintered part obtained therefrom |
CN201980056348.3A CN112639150A (en) | 2018-08-31 | 2019-08-27 | Modified high speed steel particles, powder metallurgy process using same, and sintered parts therefrom |
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EP18191896.2 | 2018-08-31 | ||
EP18191896 | 2018-08-31 |
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WO2020043718A1 true WO2020043718A1 (en) | 2020-03-05 |
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PCT/EP2019/072829 WO2020043718A1 (en) | 2018-08-31 | 2019-08-27 | Modified high speed steel particle, powder metallurgy method using the same, and sintered part obtained therefrom |
Country Status (7)
Country | Link |
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US (1) | US20210262050A1 (en) |
EP (1) | EP3844315A1 (en) |
JP (1) | JP2021535282A (en) |
KR (1) | KR20210038691A (en) |
CN (1) | CN112639150A (en) |
BR (1) | BR112021002876A2 (en) |
WO (1) | WO2020043718A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US11939646B2 (en) | 2018-10-26 | 2024-03-26 | Oerlikon Metco (Us) Inc. | Corrosion and wear resistant nickel based alloys |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3598567A (en) * | 1968-07-01 | 1971-08-10 | Nicholas J Grant | Stainless steel powder product |
WO1993019875A1 (en) | 1992-04-01 | 1993-10-14 | Brico Engineering Limited | A method of sintering machinable ferrous-based materials |
US5571305A (en) * | 1993-09-01 | 1996-11-05 | Kawasaki Steel Corporation | Atomized steel powder excellent machinability and sintered steel manufactured therefrom |
US6391083B1 (en) * | 2000-11-09 | 2002-05-21 | Kobeico Metal Powder Of America, Inc. | Mixture for powder metallurgy product and method for producing the same |
WO2009040369A1 (en) | 2007-09-28 | 2009-04-02 | Höganäs Ab (Publ) | Metallurgical powder composition and method of production |
Family Cites Families (26)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN85104791B (en) * | 1985-06-19 | 1988-07-20 | 河北省冶金研究所 | High speed tool steel and its process of heat treatment |
WO1996028580A1 (en) * | 1995-03-10 | 1996-09-19 | Powdrex Limited | Stainless steel powders and articles produced therefrom by powder metallurgy |
US6139598A (en) * | 1998-11-19 | 2000-10-31 | Eaton Corporation | Powdered metal valve seat insert |
CN1274764A (en) * | 1999-05-20 | 2000-11-29 | 重庆钢铁(集团)有限责任公司 | Cobalt-less very hard high-speed tool steel |
AT409389B (en) * | 2001-04-11 | 2002-07-25 | Boehler Edelstahl | PM high-speed steel with a high resistance to heat |
ES2242012T3 (en) * | 2001-04-25 | 2005-11-01 | Uddeholm Tooling Aktiebolag | STEEL ARTICLE. |
SE518958C2 (en) * | 2001-04-25 | 2002-12-10 | Uddeholm Tooling Ab | Steel article used as mold tools, consists of alloy of preset elements and has micro-structure containing carbides of specific type, obtained by spray forming ingot |
JP2003049241A (en) * | 2001-06-01 | 2003-02-21 | Daido Steel Co Ltd | Free-cutting steel |
JP3929029B2 (en) * | 2002-03-12 | 2007-06-13 | 三菱製鋼株式会社 | Sulfur-containing free-cutting steel |
CN100447273C (en) * | 2003-12-01 | 2008-12-31 | 株式会社神户制钢所 | Low carbon composite free-cutting steel product excellent in roughness of finished surface and method for production thereof |
JP4412133B2 (en) * | 2004-09-27 | 2010-02-10 | Jfeスチール株式会社 | Iron-based mixed powder for powder metallurgy |
US7575619B2 (en) * | 2005-03-29 | 2009-08-18 | Hitachi Powdered Metals Co., Ltd. | Wear resistant sintered member |
ES2719592T3 (en) * | 2005-09-08 | 2019-07-11 | Erasteel Kloster Ab | High speed steel made by powder metallurgy |
BR122013026772B1 (en) * | 2006-12-25 | 2018-01-09 | Nippon Steel & Sumitomo Metal Corporation | STRUCTURAL STEEL FOR MACHINES |
JP5504680B2 (en) * | 2008-07-23 | 2014-05-28 | 大同特殊鋼株式会社 | Free-cutting alloy tool steel |
CN101413082A (en) * | 2008-11-26 | 2009-04-22 | 莱芜钢铁集团粉末冶金有限公司 | Easy-to-cut water atomized steel powder and production method thereof |
CN102380613B (en) * | 2010-08-26 | 2013-08-14 | 东睦新材料集团股份有限公司 | Preparation method of powder-metallurgy refrigeration compressor valve sheet |
CN102605290B (en) * | 2012-03-20 | 2014-01-29 | 常熟市双月机械有限公司 | Powder metallurgy material used for pressing and sintering exhaust seat ring |
CN102732796A (en) * | 2012-06-07 | 2012-10-17 | 江苏天工工具有限公司 | High-performance high-speed steel |
CN103276319A (en) * | 2013-05-09 | 2013-09-04 | 天工爱和特钢有限公司 | Free-cutting high-sulfur high-speed steel |
JP6305811B2 (en) * | 2014-03-31 | 2018-04-04 | 日本ピストンリング株式会社 | Ferrous sintered alloy material for valve seat and method for producing the same |
CN105014077B (en) * | 2014-04-17 | 2017-10-31 | 东睦新材料集团股份有限公司 | The preparation method of powder metallurgical gear, sprocket wheel |
CN104131211A (en) * | 2014-08-20 | 2014-11-05 | 江苏飞达钻头股份有限公司 | Preparation method of jet-molded multi-gradient high-speed steel |
CN104195440A (en) * | 2014-09-18 | 2014-12-10 | 丹阳惠达模具材料科技有限公司 | Low-cost high-speed tool steel for cutting drill bit and preparation process of low-cost high-speed tool steel |
CN105296864A (en) * | 2015-11-15 | 2016-02-03 | 丹阳市蓝锐粉末合金制品有限公司 | High-speed steel containing carbon |
CN107267877B (en) * | 2017-06-19 | 2018-10-02 | 湖北汽车工业学院 | A kind of clean fuel engine powder metallurgy high-speed steel valve seat and its preparation process |
-
2018
- 2018-08-27 US US17/269,164 patent/US20210262050A1/en not_active Abandoned
-
2019
- 2019-08-27 CN CN201980056348.3A patent/CN112639150A/en active Pending
- 2019-08-27 EP EP19756210.1A patent/EP3844315A1/en not_active Withdrawn
- 2019-08-27 KR KR1020217008614A patent/KR20210038691A/en not_active Application Discontinuation
- 2019-08-27 BR BR112021002876-5A patent/BR112021002876A2/en not_active Application Discontinuation
- 2019-08-27 JP JP2021510771A patent/JP2021535282A/en active Pending
- 2019-08-27 WO PCT/EP2019/072829 patent/WO2020043718A1/en unknown
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3598567A (en) * | 1968-07-01 | 1971-08-10 | Nicholas J Grant | Stainless steel powder product |
WO1993019875A1 (en) | 1992-04-01 | 1993-10-14 | Brico Engineering Limited | A method of sintering machinable ferrous-based materials |
US5571305A (en) * | 1993-09-01 | 1996-11-05 | Kawasaki Steel Corporation | Atomized steel powder excellent machinability and sintered steel manufactured therefrom |
US6391083B1 (en) * | 2000-11-09 | 2002-05-21 | Kobeico Metal Powder Of America, Inc. | Mixture for powder metallurgy product and method for producing the same |
WO2009040369A1 (en) | 2007-09-28 | 2009-04-02 | Höganäs Ab (Publ) | Metallurgical powder composition and method of production |
Non-Patent Citations (1)
Title |
---|
L.G. ROY ET AL.: "Prealloyed Mn/S powders for improved machinability in P/M parts", PROGRESS IN POWDER METALLURGY A., vol. 43, 1987, pages 489 - 499 |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US11939646B2 (en) | 2018-10-26 | 2024-03-26 | Oerlikon Metco (Us) Inc. | Corrosion and wear resistant nickel based alloys |
Also Published As
Publication number | Publication date |
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BR112021002876A2 (en) | 2021-05-11 |
KR20210038691A (en) | 2021-04-07 |
JP2021535282A (en) | 2021-12-16 |
CN112639150A (en) | 2021-04-09 |
US20210262050A1 (en) | 2021-08-26 |
EP3844315A1 (en) | 2021-07-07 |
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