EP4081362A1 - Procédé de fabrication d'un objet en acier pour travail à chaud - Google Patents

Procédé de fabrication d'un objet en acier pour travail à chaud

Info

Publication number
EP4081362A1
EP4081362A1 EP20845570.9A EP20845570A EP4081362A1 EP 4081362 A1 EP4081362 A1 EP 4081362A1 EP 20845570 A EP20845570 A EP 20845570A EP 4081362 A1 EP4081362 A1 EP 4081362A1
Authority
EP
European Patent Office
Prior art keywords
weight
hardness
steel
hot
powder
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.)
Pending
Application number
EP20845570.9A
Other languages
German (de)
English (en)
Inventor
Miloslav OGNIANOV
Klaus Sammt
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Voestalpine Boehler Edelstahl GmbH and Co KG
Original Assignee
Voestalpine Boehler Edelstahl GmbH and Co KG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Voestalpine Boehler Edelstahl GmbH and Co KG filed Critical Voestalpine Boehler Edelstahl GmbH and Co KG
Publication of EP4081362A1 publication Critical patent/EP4081362A1/fr
Pending legal-status Critical Current

Links

Classifications

    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D23/00—Casting processes not provided for in groups B22D1/00 - B22D21/00
    • B22D23/06—Melting-down metal, e.g. metal particles, in the mould
    • B22D23/10—Electroslag casting
    • 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
    • B22F10/00—Additive manufacturing of workpieces or articles from metallic powder
    • B22F10/20—Direct sintering or melting
    • B22F10/28—Powder bed fusion, e.g. selective laser melting [SLM] or electron beam melting [EBM]
    • 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
    • B22F10/00—Additive manufacturing of workpieces or articles from metallic powder
    • B22F10/30—Process control
    • B22F10/36—Process control of energy beam parameters
    • B22F10/366—Scanning parameters, e.g. hatch distance or scanning strategy
    • 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
    • B22F10/00—Additive manufacturing of workpieces or articles from metallic powder
    • B22F10/60—Treatment of workpieces or articles after build-up
    • B22F10/64—Treatment of workpieces or articles after build-up by thermal means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B33—ADDITIVE MANUFACTURING TECHNOLOGY
    • B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
    • B33Y10/00—Processes of additive manufacturing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B33—ADDITIVE MANUFACTURING TECHNOLOGY
    • B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
    • B33Y70/00—Materials specially adapted for additive manufacturing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B33—ADDITIVE MANUFACTURING TECHNOLOGY
    • B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
    • B33Y80/00—Products made by additive manufacturing
    • 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
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/18—Hardening; Quenching with or without subsequent tempering
    • 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
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/18—Hardening; Quenching with or without subsequent tempering
    • C21D1/25—Hardening, combined with annealing between 300 degrees Celsius and 600 degrees Celsius, i.e. heat refining ("Vergüten")
    • 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
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/26—Methods of annealing
    • C21D1/30—Stress-relieving
    • 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
    • C21D6/002—Heat treatment of ferrous alloys containing Cr
    • 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
    • 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
    • C21D6/008—Heat treatment of ferrous alloys containing Si
    • 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
    • C22C33/0264—Making ferrous alloys by powder metallurgy characterised by the range of the alloying elements the maximum content of each alloying element not exceeding 5%
    • 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
    • C22C38/001—Ferrous alloys, e.g. steel alloys containing N
    • 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
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • 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
    • 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
    • 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
    • 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
    • C21D2211/008—Martensite
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C2200/00—Crystalline structure
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/25—Process efficiency

Definitions

  • the invention relates to a method of making a hot work steel article.
  • the material 1.2709 is currently most widespread in the powder bed process, especially for hot work applications.
  • the material 1.2709 has a practically carbon-free ( ⁇ 0.03 wt .-% C) alloy concept, very good printability at low preheating temperatures.
  • Printability here ultimately means weldability, because the powder particles are melted in particular by the action of high energy, such as laser beams, so that the conditions that are prerequisites for good weldability ultimately also apply to such powders.
  • Steels with a carbon content of more than 0.22% are no longer readily weldable.
  • the material 1.2709 develops a high hardness of around 55 HRC with a simultaneous high impact bending work of around 15 joules. In comparison to conventional hot-work steels based on carbon martensites, however, the poorer fatigue behavior of the material 1.2709 is a disadvantage.
  • the differences between nickel martensites (as with material 1.2709) and carbon martensites are described in detail in the literature (Scheidl, H., and E. Krainer.
  • an alloy which can be easily atomized to form a powder and which is based on carbon martensite and is suitable for use as a hot-work tool steel.
  • the aim here is to achieve the mechanical properties of the alloy concepts 1.2343 and 1.2344, respectively, but the requirement in particular for use in aluminum die-casting should be met, so that a mechanically high-quality alloy that is stable in aluminum die-casting is created.
  • the at low pre-heating temperatures below 200 ° C, preferably at 160 ° C to 200 ° C, particularly before given to 180 to 200 ° C to be guaranteed.
  • the combination of the alloy concept of W333 and preheating temperature enables a low-defect, additively manufactured component. Few defects result in good toughness, i.e. high impact energy.
  • the printed components can then optionally be stress relieved. Stress relieving annealing is carried out at temperatures below Acl but above 500 ° C and serves to reduce internal stresses.
  • quenching By subsequent rapid cooling (“quenching”), ie cooling above the critical cooling rate, the carbon cannot diffuse away; the carbon-rich austenite converts into carbon-stressed, hard martensite. Quenching can be in oil, for example, or, if hardening, in a vacuum or below Protective gas atmosphere took place, with nitrogen or argon.
  • the secondary hardness carbides which are required for the high-temperature strength of hot-work steels, are formed from the alloy elements.
  • the combined heat treatment of hardening and tempering is also called quenching and tempering.
  • the specified heat treatment times only after complete Heating through, ie after the component core has been reached to the target temperature, is expected. If no holding periods are given, the heat treatment is carried out at least until the material has been thoroughly heated.
  • undesired retained austenite can also be converted.
  • Components manufactured with additive manufacturing have a high residual austenite content, typically> 10%.
  • Retained austenite can transform into ferrite / cementite or martensite at the high operating temperatures to which hot-work steels are typically exposed. This phase transformation is accompanied by a change in volume, which can lead to mechanical stresses, cracks and ultimately a break in the component. A component failure can have devastating consequences, especially with aluminum die casting. Therefore, according to the invention, the residual austenite content should be kept very low, preferably below the detection limit of ⁇ 1%.
  • the material 1.2365 is a hot-work steel that is used in the processing of copper and brass.
  • the carbon content is around 0.3% by weight and is easier to weld than the materials 1.2343 and 1.2344.
  • the alloy W333 was developed according to the invention, which is more suitable for additive manufacturing than comparable hot-work steels and meets the mechanical requirements of 1.2343 and 1.2344.
  • the carbon content is set at around 0.3% by weight, which guarantees improved weldability compared to 1.2343 and 1.2344.
  • the silicon content is adapted, whereby the slightly low carbon content in relation to the hardness that can be achieved is compensated for by increasing the silicon content (solid solution strengthener). This also results in an improved flowability of the melt, as a result of which the atomizability is improved.
  • silicon shifts the secondary hardness peak to higher tempering temperatures and increases the tempering resistance.
  • molybdenum can be added in addition to 1.2343 and 1.2344.
  • the additively manufactured workpiece created in accordance with the invention meets the requirements of conventionally manufactured components for aluminum die casting, namely fully martensitic structure with residual austenite content ⁇ 1% according to ASTM E 975 (in particular HS1 rated according to NADCA # 207-2016), hardness between 44 and 52 HRC according to ASTM E 18-17 (2017), in particular a notch impact energy of 22 J according to ASTM E 23-16b (2016) with a hardness of 45 - 46 HRC.
  • the exceptionally good impact work is due to the fine structure, in particular a grain rated according to ASTM E 112 finer 13 and the low porosity.
  • the tensile test was carried out in accordance with ISO 6892-1 (2016).
  • the invention thus relates in particular to a method for producing a hot-work steel object, wherein a steel melt is produced and the steel melt is then atomized to a powder, the steel melt having the following alloy elements (all data in% by weight):
  • V 0.60 to 1.00 and optionally one or more of
  • selective laser melting is used for printing, with the laser power between 200 and 340 W, in particular between 220 and 320 W, the laser progress speed between 500 and 1000 mm / sec, in particular between 540 and 870 mm / sec and the line spacing is between 0.05 and 0.15 mm, in particular between 0.08 and 0.14 mm.
  • the object is heat-treated via Ac3, preferably at 900 to 1100 ° C., particularly preferably at 960 to 1030 ° C., for the purpose of hardening, and is then quenched in particular in an oil bath.
  • the object is stress relieved for 60 to 120 minutes before curing between 600 to 700 ° C, in particular special between 650 and 690 ° C.
  • the hardened object is tempered at 530 to 630 ° C.
  • this relates to an additively manufactured object made of a steel material, the steel material being made up of the following alloy elements (in% by weight):
  • V 0.60 to 1.00 and optionally one or more of
  • the object has a porosity of ⁇ 0.06%, preferably ⁇ 0.04%, particularly preferably ⁇ 0.02%.
  • Figure 1 a table showing the chemical composition of three known ones
  • FIG. 2 a tempering hardness-notched impact work diagram of the material according to the invention W333;
  • FIG. 6 the representations according to FIG. 5 for a hot-work steel based on 1.2777;
  • Important printing parameters are the laser power or the energy introduced per volume, the scanning speed, the layer height, the line spacing, the focus diameter and the volume energy density during printing.
  • the alloy according to the invention has a higher silicon content, the silicon lowering the melting temperature, improving the flowability and improving the atomizability of the melt overall.
  • silicon increases the hardness.
  • the material according to the invention with 0.30% C achieves a minimum porosity of ⁇ 0.01% over large areas, the maximum value is 0.02-0.04%, the average (main effects plot) is 0 , 01 - 0.04%.
  • the lowest possible porosity should be aimed for, this is preferably ⁇ 0.1%, further preferably ⁇ 0.06%, particularly preferably ⁇ 0.04% and particularly preferred ⁇ 0.02%.
  • the property profile of the material W333 according to the invention is able to be in the desired and necessary hardness range for aluminum die-casting applications, namely 44 to 52 HRC, at the level of the known materials, although the very high quality of the printed material is a significant advantage due to its high resistance to process parameters compared to the known work materials is achieved.
  • the density of the material according to the invention is 99.9% after printing, with no microcracks or binding defects being detectable.
  • the characterization took place in the condition as built (i.e. directly after additive manufacturing) and after the heat treatment. Then tempering hardness-notched impact energy diagram, mechanical properties and microstructure were recorded and compared with known materials. Porosity measurements, hardness measurements, tensile tests and impact tests were carried out and the characterization of the microstructure carried out using light microscopic examinations (structure and grain size) as well as scanning electron microscopic examinations for defect analysis and XRD measurements for determining retained austenite.
  • the chemical composition of the powders used is shown in FIG. 14. It should be noted that a few 0.01% by weight of carbon can be lost during additive manufacturing.
  • FIG. 8 the structure is shown in the state as it was built, ie directly after the additive manufacturing without further heat treatments, at different magnifications.
  • the material after printing has a carbon content of 0.26% by weight, the relative density being 99.99%.
  • Microcracks and binding defects could not be detected, whereby an additional scanning electron microscopic examination showed that the number and size of the non-metallic inclusions is very low or very small ( ⁇ 20 ⁇ m) and the non-metallic inclusions are predominantly round SiO2 inclusions .
  • Round inclusions are preferable to angular inclusions, as the corners lead to an increased notch effect or an increased state of stress, which can act as a crack trigger. A high degree of flomogeneity was achieved here.
  • the samples obtained in this way were optionally stress-relieved for 1 hour at 690 ° C and then cooled in air, hardened at a hardening temperature of 1030 ° for 20 minutes and quenched in oil and then tempered twice for 2 hours each at different temperatures.
  • stress-relieving annealing can be carried out at a maximum of 700 ° C, above which decarburization and the formation of undesirable precipitates and undesirable grain size can occur.
  • the glow time should not be selected too long. If the glow periods are too short or temperatures are too low, the positive ones occur Effects that cause the fine structure no longer appear.
  • the annealing temperature in the stress relief annealing is preferably from 650 to 690.degree.
  • FIG. 9 shows the hardness, tempering, notch impact values at the different tempering temperatures and the same hardening temperature of 1030 ° C. in each case.
  • the corresponding diagram in FIG. 2 results from this.
  • FIG. 10 shows the differences between the samples at a tempering temperature of 575 ° C. and 625 ° C., each with a stress-relieving anneal and without a stress-relieving anneal before quenching and tempering.
  • the resulting hardness is comparable, the toughness increases slightly due to the stress relief annealing.
  • the fine microstructure Due to the lowering of the hardening temperature, the fine microstructure is retained regardless of the previous stress relieving annealing (with and without stress relieving, grain 12 rated according to ASTM, structure HS4 rated according to NADCA).
  • the structure is fully martensitic, the residual austenite content is ⁇ 1% in both samples.
  • FIG. 15 shows various chemical compositions of the powder according to the invention.
  • FIG. 17 shows the notch impact work with different hardness states, which shows that the additively manufactured component according to the invention has toughness compared to the conventionally manufactured components made of the materials 1.2343 / H11 and 1.2344 / H13 for the hardness state of 44 - 52 HRC, which is preferred for aluminum die-casting applications, is at the same level as required.
  • Figure 18 shows that the tensile strength and the yield strength at 0.2% plastic deformation with different hardness states of the additively manufactured component according to the invention, as required, come close to the conventionally manufactured components from the materials 1.2343 and 1.2344 with typical hardness states between 43 and 51 HRC .
  • FIG. 19 shows the manufacturing route of the workpiece.
  • the powder with the composition according to the invention is atomized, and a component is produced from the powder by means of additive manufacturing.
  • the component can optionally be stress relieved, then it is hardened and tempered.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Organic Chemistry (AREA)
  • Metallurgy (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Health & Medical Sciences (AREA)
  • Child & Adolescent Psychology (AREA)
  • Automation & Control Theory (AREA)
  • Plasma & Fusion (AREA)
  • Heat Treatment Of Articles (AREA)
  • Powder Metallurgy (AREA)

Abstract

L'invention concerne un procédé de fabrication d'un objet en acier pour travail à chaud, selon lequel un acier fondu est produit et l'acier fondu est ensuite aéré par pulvérisation pour former une poudre, l'acier fondu présentant les éléments d'alliage suivants (toutes les indications étant exprimées en pourcentage en poids) : C = 0,25 - 0,32, Si = 0,80 - 1,20, Mn = 0,20 - 0,50, Cr = 2,50 - 5,00, Mo = 2,50 - 3,50, V = 0,60 à 1,00, ainsi qu'éventuellement un ou plusieurs des éléments suivants : Ni ≤ 1,00, S ≤ 0,25, P ≤ 0,25, N ≤ 0,1, W ≤ 1,0, Co ≤ 1,0, Cu ≤ 0,9, Ti ≤ 0,9, Nb ≤ 0,9, Ta ≤ 0,9, Zr ≤ 0,9, AI ≤ 0,2, Bore ≤ 0,2, le reste étant du fer et des impuretés liées à la fusion, la poudre étant imprimée selon le procédé du lit de poudre, la température de préchauffage étant ≤ 200 °C, de préférence comprise entre 160 et 200°C, plus particulièrement encore entre 180e et 200°C.
EP20845570.9A 2019-12-27 2020-12-23 Procédé de fabrication d'un objet en acier pour travail à chaud Pending EP4081362A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102019135830.2A DE102019135830A1 (de) 2019-12-27 2019-12-27 Verfahren zum Herstellen eines Warmarbeitsstahlgegenstandes
PCT/EP2020/087753 WO2021130301A1 (fr) 2019-12-27 2020-12-23 Procédé de fabrication d'un objet en acier pour travail à chaud

Publications (1)

Publication Number Publication Date
EP4081362A1 true EP4081362A1 (fr) 2022-11-02

Family

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Family Applications (1)

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Country Status (3)

Country Link
EP (1) EP4081362A1 (fr)
DE (1) DE102019135830A1 (fr)
WO (1) WO2021130301A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20210136966A (ko) * 2019-03-14 2021-11-17 회가나에스 코오포레이션 프레스-및-소결 및 적층 제조를 위한 야금 조성물
EP4119267A1 (fr) * 2021-07-12 2023-01-18 Deutsche Edelstahlwerke Specialty Steel GmbH & Co. KG Poudre d'acier, utilisation d'un acier pour produire une poudre d'acier et procédé de fabrication d'un composant à partir d'une poudre d'acier
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