WO2012152477A1 - Alliage chrome-molybdène - Google Patents

Alliage chrome-molybdène Download PDF

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Publication number
WO2012152477A1
WO2012152477A1 PCT/EP2012/054363 EP2012054363W WO2012152477A1 WO 2012152477 A1 WO2012152477 A1 WO 2012152477A1 EP 2012054363 W EP2012054363 W EP 2012054363W WO 2012152477 A1 WO2012152477 A1 WO 2012152477A1
Authority
WO
WIPO (PCT)
Prior art keywords
alloy
temperature
range
period
minutes
Prior art date
Application number
PCT/EP2012/054363
Other languages
German (de)
English (en)
Inventor
Matthias Kuntz
Friedrich Muehleder
Original Assignee
Robert Bosch Gmbh
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 Robert Bosch Gmbh filed Critical Robert Bosch Gmbh
Priority to EP12710674.8A priority Critical patent/EP2732061B1/fr
Publication of WO2012152477A1 publication Critical patent/WO2012152477A1/fr

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
    • 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
    • C22C38/08—Ferrous alloys, e.g. steel alloys containing nickel
    • 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
    • C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium

Definitions

  • the present invention relates to a chromium-molybdenum alloy. More particularly, the present invention relates to an alloy based on 42CrMo4 or 18CrNiMo7-6 which comprises an alloy of manganese and a
  • high-strength materials are needed.
  • a significant limitation of the use of high-strength materials is given for example by their mechanical properties.
  • the component manufacturing route may impose limitations. Especially for large-sized components, a high strength of importance, since often act large forces and a replacement of damaged parts is very expensive.
  • This steel is based on an AFP steel and has the following composition, each in weight%: carbon: 0.35-0.50; Silicon: 0.15-0.80; Manganese: 1, 20-2, 00; Phosphorus: 0.00-0.0025; Nitrogen: 0.010-0.035; Chromium: 0.00-0.50; Molybdenum: 0.00-0.050; Nickel: 0.00-0.15; Copper: 0.00-0.40; Vanadium: 0.13-0.40; Titanium: 0.001-0.004; Aluminum: 0.00-0.04; Niobium: 0.00-0.05; in which at least two of the elements vanadium, aluminum and niobium are included. It is stated that a low titanium content of 0.001 wt.% To 0.004 wt.% Is a decisive factor in order to obtain mechanical properties comparable to the mechanical properties of tempered steels.
  • the invention relates to a chromium-molybdenum alloy selected from the group consisting of 42CrMo4 and 18CrNiMo7-6, the alloy comprising: manganese in an amount of> 1, 0 wt .-% to ⁇ 1, 3 wt .-% ; Aluminum in an amount of> 0 wt .-% to ⁇ 0.05 wt .-%; Niobium in an amount of> 0 wt .-% to ⁇ 0.04 wt .-% and nitrogen in an amount of> 0 wt .-% to ⁇ 0.015 wt .-%.
  • the alloy according to the invention has a defined composition of characteristic alloying elements.
  • Alloy according to the invention form the tempering steel 42CrMo4 or the insert steel 18CrNiMo7-6.
  • the composition of such alloys is known to those skilled in the art.
  • a 42CrMo4 alloy and an 18CrNiMo7-6 alloy include in particular the following metallic ones
  • the per se known alloys 42CrMo4 or the insert steel 18CrNiMo7-6 are modified according to the invention by an addition of manganese, whereby the amount of manganese according to the invention no longer corresponds to the amounts given in Table 1, but are higher, in particular in a range of> 1, 0 to ⁇ 1, 3 wt .-%. Furthermore, the alloys according to the invention have a microalloy of niobium, aluminum and nitrogen.
  • aluminum is present in an amount of> 0 wt .-% to ⁇ 0.05 wt .-%; Niobium in an amount of> 0 wt .-% to ⁇ 0.04 wt .-% and nitrogen in an amount of> 0 wt .-% to ⁇ 0.015 wt .-% before.
  • Aluminum is particularly preferably present in an amount of> 0.01% by weight to ⁇ 0.025% by weight; Niobium in an amount of> 0.01 wt .-% to ⁇ 0.02 wt .-% and nitrogen in an amount of> 0.005 wt .-% to ⁇ 0.010 wt .-% before.
  • a niobium content of ⁇ 0.03 wt% may be sufficient.
  • Alloy structure leads.
  • the micro-alloying elements prevent grain growth in a heat treatment. Therefore, according to the present invention, it is possible to obtain an ASTM grain size in a range of> 12 to ⁇ 13 with a heat treatment route in a 42CrMo4-based alloy. Further, according to the present invention, in an alloy based on 18CrNiMo7-6, an ASTM grain size in a range of> 13 to ⁇ 14 can be obtained.
  • ASTM grain size ASTM: American Society for Testing Materials
  • microalloyed alloying partners can form aluminum and niobium according to the invention with the likewise added micro-alloyed nitrogen carbonitrides.
  • These intermetallic compounds attach themselves to the grain boundaries and can thus prevent grain growth and thus lead to smaller particle sizes.
  • the added manganese stabilizes especially the austenitic ones
  • the alloy according to the invention makes it possible, in particular, to make it possible to increase the cyclic resistance and the resistance to rolling fatigue, whereby the component production route can essentially remain unchanged. This can improve the reliability of the components without significant additional costs or without
  • Properties can be improved, for example, the power density of large gearboxes.
  • the alloy according to the invention can also be used without difficulty in existing processes in a wide range, which makes possible a wide range of application of the invention. This is particularly advantageous in the case of large transmission components, since here the component production route is severely limited due to the dimensioning of the components.
  • the alloy may further comprise phosphorus and / or sulfur and / or oxygen. These elements can occur as accompanying elements and can have a concentration in a conventional range known to the person skilled in the art.
  • phosphorus for example, can increase the strength, in particular the tensile strength, and the hardness, in particular at a carbon content of about 0.1% and at the same time
  • the manganese is present in an amount of> 1, 0 wt .-% to ⁇ 1, 2 wt .-%, and / or the aluminum is in an amount of> 0.04 wt .-% to ⁇ 0.05 Wt .-% before, and / or the nitrogen is present in an amount of ⁇ 0.010 wt .-%.
  • a composition could be particularly good
  • the alloy according to the invention is a chromium-molybdenum alloy selected from the group consisting of 42CrMo4 and 18CrNiMo7-6, the alloy being used as further alloy components, ie as alloy constituents in addition to the
  • Base alloy constituents of the 42CrMo4 alloy or the 18CrNiMo7-6 alloy exclusively comprising: aluminum, niobium, nitrogen and optionally phosphorus, sulfur and / or oxygen.
  • the alloy constituents are present in particular in the above-described concentrations, the alloy components being present together with a remainder of iron and thus adding up to 100% by weight.
  • the term "alloying component” refers in particular to substances which form mixed crystals with one another.
  • the invention further relates to a method for producing a component, comprising the steps:
  • the inventive method can be produced in a particularly simple manner, a component which consists of the alloy according to the invention or is constructed essentially of this.
  • an alloy according to the invention is first provided, which can be carried out by a conventional method known to the person skilled in the art.
  • the alloy may be provided in a conventional steelmaking process with the actual alloying adjustment in secondary metallurgy.
  • the alloy is shaped, that is brought into a shape corresponding to the component to be produced.
  • the molded alloy is subjected to a heat treatment.
  • the heat treatment can have several functions.
  • the individual constituents of the alloy can be homogenized by a heat treatment.
  • a heat treatment is used in particular to harden the alloy.
  • the alloy according to the invention is based on an 18CrNiMo7-6 alloy, by a conventional multiple hardening.
  • the shaped alloy can be repeatedly heated to a temperature in a range of> 800 ° C to ⁇ 1200 ° C and quenched after a short time of holding the temperature. This method is known to those skilled in the art.
  • the heat treatment may in particular comprise the following steps:
  • the heat treatment is thus a heat treatment comprising four steps.
  • the four steps can also be carried out individually and independently of each other as a single heat treatment or in a suitable combination of the individual steps.
  • heating ramps in a range of> 2 ° C / s to ⁇ 4 ° C / s, in particular of 3.3 ° C / s are preferably used for each heating, whereas for each cooling quench ramps in a range of> 25 ° C / s to ⁇ 75 ° C / s, in particular of 50 ° C / s used.
  • a solution annealing is carried out, which serves in particular to homogenize the individual alloy components.
  • This solution annealing is carried out in particular in a temperature range of> 1000 ° C to ⁇ 1400 ° C, preferably at 1200 ° C for a period of> 3 minutes to ⁇ 7 minutes, preferably 5 minutes.
  • the alloy becomes a two-stage
  • This step is a so-called FP annealing (ferritic-perlitic) and serves
  • This step is particularly described with reference to the first stage in a temperature range of> 800 ° C to ⁇ 1000 ° C, preferably at 900 ° C for a period of> 20 minutes to ⁇ 45 minutes, preferably for 30 minutes and then with reference to the second stage in a temperature range of> 550 ° C to ⁇ 790 ° C, preferably at 680 ° C for a period of> 60 minutes to ⁇ 120 minutes, preferably for 90 minutes performed.
  • a so-called pendulum annealing takes place.
  • the alloy is alternately heated to a temperature in a range of in particular> 750 ° C to ⁇ 1000 ° C, preferably 850 ° C and subsequent to a temperature in a range of in particular> 550 ° C to ⁇ 745 ° C,
  • the respective upper temperature is maintained for a period in a range of> 10 seconds to ⁇ 45 seconds, preferably 30 seconds
  • the respective lower temperature for a period in a range of> 5 seconds to ⁇ 10 Seconds, preferably 7.5 seconds is held.
  • Grain formation increases, which is why a plurality of smaller nuclei is formed.
  • pendulum annealing so a variety of corresponding cycles, such as three cycles, this effect can be amplified.
  • the fourth step comprises heating the alloy to a temperature in a range of> 750 ° C to ⁇ 1000 ° C, in particular
  • the invention further relates to a component comprising an alloy according to the invention.
  • the invention includes in particular components that a Cyclic stress are exposed and in particular those experiencing a Wälzbe bulkung.
  • components according to the invention include gearboxes and, in particular, large gearboxes or gearboxes whose components, such as toothed wheels or stationary components in the
  • the invention further relates to the use of an alloy according to the invention for producing a component. This is a use
  • Fig. 1 is a schematic timing diagram for illustrating a
  • FIG. 1 shows a time diagram of a method according to the invention for producing a component.
  • the inventive method is based on the use of a chromium-molybdenum alloy according to the invention, selected from the group consisting of 42CrMo4 and 18CrNiMo7-6, wherein the alloy comprises: manganese in an amount of> 1, 0 wt .-% to ⁇ 1.3 wt .-%; Aluminum in an amount of> 0 wt .-% to ⁇ 0.05 wt .-%; Niobium in an amount of> 0 wt .-% to ⁇ 0.04 wt .-% and nitrogen in an amount of> 0 wt .-% to ⁇ 0.015 wt .-%.
  • the alloy After the alloy has been shaped into the desired component, it is subjected to a heat treatment to set the desired mechanical properties.
  • the heat treatment comprises four steps and is shown schematically in FIG. 1 in a non-limiting embodiment in the form of a time diagram.
  • a solution annealing designated by a) is carried out, wherein the alloy is heated to a temperature range of 1200 ° C with a heating ramp of 3.3 ° C / s, where it remains for a period of 5 minutes and to a temperature of 0 ° C using a
  • Quench ramp of 50 ° C / s is cooled or quenched.
  • an FP annealing designated by b) is carried out, wherein the alloy is heated to a temperature of 900 ° C. with a heating ramp of 3.3 ° C./s and remains at this temperature for a period of 30 minutes. Subsequently, the alloy is cooled to a temperature of 680 ° C using a quench ramp of 50 ° C / s and left at this temperature for a period of 90 minutes, after which the alloy is heated to a temperature using a quench ramp of 50 ° C / s is cooled or quenched from 0 ° C.
  • a pendulum annealing there is a pendulum annealing called c).
  • the alloy is heated a total of three times with a heating ramp of 3.3 ° C / s to a temperature of 850 ° C and remains at that temperature for a period of 30 seconds.
  • each alloy is cooled to a temperature of 660 ° C using a quench ramp of 50 ° C / s and left there for 7.5 minutes each time is heated again to 850 ° C using the above-described Aufhardrampe.
  • a quench ramp 50 ° C / s to a temperature of 0 ° C.
  • the fourth step is a hardening referred to as d), wherein the alloy is heated to a temperature range of 850 ° C with a heating ramp of 3.3 ° C / s, there for a period of 10 minutes and to a temperature of 0 ° C below Using a Abschreckrampe of 50 ° C / s is cooled or quenched.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Heat Treatment Of Articles (AREA)
  • Powder Metallurgy (AREA)

Abstract

L'invention concerne un alliage chrome-molybdène, sélectionné dans le groupe constitué de 42CrMo4 et 18CrNiMo7-6, cet alliage comprenant : une quantité de manganèse ≥ 1,0 % en poids et ≤ 1,3 % en poids; une quantité d'aluminium > 0 % en poids et ≤ 0,05 % en poids; une quantité de niobium > 0 % en poids et ≤ 0,04 % en poids et une quantité d'azote > 0 % en poids et ≤ 0,015 % en poids. L'alliage selon l'invention sert en particulier à fabriquer un élément présentant des propriétés améliorées en termes de résistance aux contraintes pour un contact roulant.
PCT/EP2012/054363 2011-05-12 2012-03-13 Alliage chrome-molybdène WO2012152477A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP12710674.8A EP2732061B1 (fr) 2011-05-12 2012-03-13 Alliage chrome-molybdène

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102011075697.3 2011-05-12
DE102011075697A DE102011075697A1 (de) 2011-05-12 2011-05-12 Chrom-Molybden-Legierung

Publications (1)

Publication Number Publication Date
WO2012152477A1 true WO2012152477A1 (fr) 2012-11-15

Family

ID=45888175

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2012/054363 WO2012152477A1 (fr) 2011-05-12 2012-03-13 Alliage chrome-molybdène

Country Status (3)

Country Link
EP (1) EP2732061B1 (fr)
DE (1) DE102011075697A1 (fr)
WO (1) WO2012152477A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109609867A (zh) * 2018-11-05 2019-04-12 南京中船绿洲机器有限公司 一种18CrNiMo7-6材料及其低温冲击热处理方法
CN110565018A (zh) * 2019-09-25 2019-12-13 山东钢铁股份有限公司 一种改善低碳高合金齿轮钢退火态带状组织的控制方法

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106312000A (zh) * 2016-10-12 2017-01-11 中原特钢股份有限公司 立式连铸生产齿轮钢用18CrNiMo7‑6连铸圆坯方法
CN106424524B (zh) * 2016-10-14 2018-10-12 太原科技大学 一种17CrNiMo6钢风力发电齿轮的锻造方法

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0673492A (ja) * 1993-03-19 1994-03-15 Aichi Steel Works Ltd 高品質肌焼鋼
DE102007021101A1 (de) 2007-05-03 2008-11-06 Mahle International Gmbh Legierter Stahl und dessen Verwendung
DE102008004371A1 (de) * 2008-01-15 2009-07-16 Robert Bosch Gmbh Bauelement, insbesondere eine Kraftfahrzeugkomponente, aus einem Dualphasen-Stahl

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0673492A (ja) * 1993-03-19 1994-03-15 Aichi Steel Works Ltd 高品質肌焼鋼
DE102007021101A1 (de) 2007-05-03 2008-11-06 Mahle International Gmbh Legierter Stahl und dessen Verwendung
DE102008004371A1 (de) * 2008-01-15 2009-07-16 Robert Bosch Gmbh Bauelement, insbesondere eine Kraftfahrzeugkomponente, aus einem Dualphasen-Stahl

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
SAARSTAHL: "Werkstoff-Datenblatt Saarstahl - 42CrMo4 - 42CrMoS4", 1 June 2010 (2010-06-01), XP002677711, Retrieved from the Internet <URL:http://www.saarstahl.com/fileadmin/saarstahl_extranet/images/04_produkte/walzstahlsorten/deutsch/7225_7227_42CrMo4_42CrMoS4.pdf> [retrieved on 20120614] *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109609867A (zh) * 2018-11-05 2019-04-12 南京中船绿洲机器有限公司 一种18CrNiMo7-6材料及其低温冲击热处理方法
CN110565018A (zh) * 2019-09-25 2019-12-13 山东钢铁股份有限公司 一种改善低碳高合金齿轮钢退火态带状组织的控制方法
CN110565018B (zh) * 2019-09-25 2021-06-01 山东钢铁股份有限公司 一种改善低碳高合金齿轮钢退火态带状组织的控制方法

Also Published As

Publication number Publication date
EP2732061B1 (fr) 2017-06-21
DE102011075697A1 (de) 2012-11-15
EP2732061A1 (fr) 2014-05-21

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