EP2690187A2 - Alloy, corresponding part and manufacturing method - Google Patents

Alloy, corresponding part and manufacturing method Download PDF

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Publication number
EP2690187A2
EP2690187A2 EP13176453.2A EP13176453A EP2690187A2 EP 2690187 A2 EP2690187 A2 EP 2690187A2 EP 13176453 A EP13176453 A EP 13176453A EP 2690187 A2 EP2690187 A2 EP 2690187A2
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EP
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Prior art keywords
alloy
alloy according
addition
casting
nickel
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EP13176453.2A
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German (de)
French (fr)
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EP2690187B1 (en
EP2690187A3 (en
Inventor
Jean-Baptiste PRUNIER
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Ferry-Capitain Sarl
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Ferry-Capitain Sarl
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Priority to PL13176453T priority Critical patent/PL2690187T3/en
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Publication of EP2690187A3 publication Critical patent/EP2690187A3/en
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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C37/00—Cast-iron alloys
    • C22C37/04—Cast-iron alloys containing spheroidal graphite
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C37/00—Cast-iron alloys
    • C22C37/10—Cast-iron alloys containing aluminium or silicon

Definitions

  • the present invention relates to a spheroidal graphite cast iron alloy.
  • toothed rings which are for example used to transmit a driving torque to a mill.
  • These crowns are made of spheroidal graphite cast iron or steel.
  • the spheroidal graphite cast gear teeth are calculated either according to the AGMA 6014 standard (respectively 6114) or according to the ISO 6336 standard.
  • the maximum allowable stresses are given according to the curves of part 5 of this same standard, curves of ⁇ Hlim (pressure stress) and ⁇ flim (bending stress of tooth base), as a function of the hardnesses.
  • ⁇ Hlim pressure stress
  • ⁇ flim bending stress of tooth base
  • the hardness range is up to 300HB
  • the shades achieved are according to EN 1563 - spheroidal graphite cast iron grades - in which only the shades are taken into account. matrix ferritic, pearlitic and / or martensitic returned.
  • the current melting grades make it possible to obtain at best hardnesses of 320HB on toothed crowns. For the very strong powers, they reach their limit of use and the only solution currently is to change material by passing to the molded steel.
  • the hardnesses of 320HB of current fonts are obtained by quenching followed by income.
  • the invention aims to allow the manufacture of a cast iron part whose transmittable power is important.
  • the object of the invention is to enable the manufacture of a cast iron part, such as a ring gear, especially of large size, made of spheroidal graphite cast iron.
  • the objective is to develop a alloy grade that meets these criteria especially with simple and economical heat treatment means.
  • the subject of the invention is an alloy as indicated in claim 1.
  • the alloy comprises one or more of the features indicated in claims 2 to 8.
  • the invention also relates to a part which is made of an alloy as described above and which is defined in claims 9 and 10.
  • the invention also relates to methods of manufacturing a part which are defined in claims 11 to 13.
  • the invention relates to a spheroidal graphite cast iron alloy. It makes it possible to obtain high hardness and therefore high allowable stresses, especially on large parts.
  • the piece is for example a toothed wheel or a ring gear.
  • the workpiece is preferably a large workpiece, namely having a larger dimension of the workpiece of at least 2000mm.
  • the part has an outside diameter of at least 2000mm, or at least 3000mm, or at least 6000mm.
  • the axial thickness, generally the width of teeth, the widest part is for example at least 150mm, or at least 250mm, or at least 550mm.
  • a ring gear according to the invention has a rim thickness of at least 80 mm or at least 120 mm or at least 150 mm and a modulus of at least 10 or at least 16 or at least 22 or at least 25.
  • the high hardness is obtained with a heat treatment of income.
  • the hardness depends on the composition of the alloy and possibly the different heat treatments that the part undergoes during its preparation, whether during cooling after casting or subsequent baking.
  • a first aspect of the invention is the chemical composition of the alloy.
  • the alloy is a spheroidal graphite cast iron.
  • the addition elements are carbon (C), silicon (Si), and magnesium (Mg).
  • the element that constitutes the rest of the alloy is therefore iron (Fe).
  • the alloy comprises, in addition to the base composition, nickel (Ni) between 3.5% and 7%, copper (Cu) between 0.5% and 3% and molybdenum (Mo) between 0.15 % and 1%.
  • the alloy may comprise manganese (Mn) up to 1% or up to 0.8%.
  • the alloy may comprise chromium (Cr) up to 0.4%.
  • the alloy may comprise carbon (C) between 2.5% and 4% and silicon (Si) between 1.5% and 4.4%.
  • the nickel (Ni) content of the alloy may be at least 3.5%, 4%, 4.1%, 4.2%, 4.3%, 4.4%, 4.5%, or 4%. , 8% and not more than 7%, 6.5%, 6%, or 5.8%.
  • the content of molybdenum (Mo) can be between at least 0.15%, 0.25%, or 0.3% and at most 1%, 0.8%, or 0.5%.
  • the copper content (Cu) may be at least 0.5%, 1%, or 1.5%, and at most 3%, 2.5%, or 2.2%.
  • the nickel content may therefore for example be between 4.4% and 7%.
  • the carbon content (C) can be between 3% and 3.6%.
  • the silicon content (Si) can be between 1.8% and 2.4%.
  • the chromium (Cr) content may be less than 0.2%.
  • the Manganese content (Mn) may be greater than 0.2%.
  • the alloy according to the invention can consist of these elements above, knowing that Manganese (Mn), and / or Chromium (Cr) and / or Phosphorus (P) and / or Sulfur (S) is / are optional element (s) or present (s) in traces.
  • Mn Manganese
  • Cr Chromium
  • P Phosphorus
  • S Sulfur
  • the alloy comprises in addition to iron (Fe) and unavoidable impurities, the following elements, within the limits indicated: VS Yes Or MB Cu mn Cr mg P S mini 2.5 1.5 3.5 0.15 0.5 0.02 max 4 4.4 7 1 3 1 0.4 0.1 0.04 0,015
  • the hardness that can be obtained by the alloy according to the invention is indicated below, depending on the chemical composition, in addition to the base composition: Or MB Cu VS Yes mn HB 320 4.3 to 5.6 0.3 to 0.45 1,5-2 3.3 to 3.45 1.8-2 0.3-0.6 HB 330 4.6 to 5.9 0.3 to 0.45 1,5-2 3.3 to 3.45 1.8-2 0.3-0.6 HB 340 4.7 to 6 0.3 to 0.45 1,5-2 3.3 to 3.45 1.8-2 0.3-0.6 HB 350 4.8 to 6.1 0.35-0.5 1,5-2 3.3 to 3.45 1.8-2 0.3-0.6 HB 360 4.9 to 6.2 0.35-0.5 1,5-2 3.3 to 3.45 1.8-2 0.3-0.6
  • a second aspect of the invention is the method of manufacturing a part made of an alloy according to the invention.
  • slow means less than 100 ° C / h, 80 ° C / h or 50 ° C / h. Slow cooling preferably takes place throughout the cooling period.
  • Heat treatment is income. It is a heat treatment in the mass, it allows to obtain the desired hardness and indicated above over the entire thickness of the room. The hardness therefore does not extend only a few millimeters on the surface.
  • the workpiece is then machined, in particular by turning and in the case of a ring gear, the teeth are cut.
  • the HB hardness of the alloy according to the invention, and in particular of spheroidal graphite cast iron, is between 320HB and 400HB.
  • the piece made of this alloy thus makes it possible to transmit very high powers.
  • the metallographic structure obtained from the alloy is composed of 90% type VI or V nodules (according to EN ISO 945-1) and a bainitic matrix that may contain residual austenite (up to 10%), carbides (up to 5%), restored martensite (up to 5%) and perlite (up to 20%).
  • the fatigue limit resistances are given for a calculation according to ISO 6336.

Abstract

A spheroidal graphite cast iron alloy comprises between 3.5 wt.% and 7 wt.% nickel, between 0.5 wt.% and 3 wt.% copper, between 0.15 wt.% and 1 wt.% molybdenum, and remaining iron and unavoidable impurities. Independent claims are included for the following: (1) alloy product; and (2) manufacture of alloy product.

Description

La présente invention concerne un alliage de fonte à graphite sphéroïdal.The present invention relates to a spheroidal graphite cast iron alloy.

On connaît, dans l'état de la technique, des couronnes dentées qui sont par exemple utilisées pour transmettre un couple d'entraînement à un broyeur. Ces couronnes sont en fonte à graphite sphéroïdal ou en acier.In the state of the art, toothed rings are known which are for example used to transmit a driving torque to a mill. These crowns are made of spheroidal graphite cast iron or steel.

Dans l'état de la technique, les couronnes dentées en fonte à graphite sphéroïdal sont calculées soit suivant la norme AGMA 6014 (respectivement 6114) soit suivant la norme ISO 6336.In the state of the art, the spheroidal graphite cast gear teeth are calculated either according to the AGMA 6014 standard (respectively 6114) or according to the ISO 6336 standard.

Selon la norme ISO 6336, les contraintes maximales admissibles sont données suivant les courbes de la partie 5 de cette même norme, courbes des σHlim (contrainte en pression) et σflim (contrainte en flexion pied de dent), en fonction des duretés. Plus la dureté est élevée, plus les contraintes maximales admissibles sont élevées et donc plus la puissance transmissible par la couronne sera importante.According to the ISO 6336 standard, the maximum allowable stresses are given according to the curves of part 5 of this same standard, curves of σ Hlim (pressure stress) and σ flim (bending stress of tooth base), as a function of the hardnesses. The higher the hardness, the higher the maximum permissible stresses, and therefore the more power that the crown will transmit.

Dans les courbes actuelles de l'ISO 6336, la gamme de dureté s'étend jusqu'à 300HB, les nuances réalisées le sont suivant la norme EN 1563 - nuances de fonte à graphite sphéroïdal - dans laquelle seules sont prises en considération les nuances à matrice ferritique, perlitique et/ou martensitique revenue.In the current curves of ISO 6336, the hardness range is up to 300HB, the shades achieved are according to EN 1563 - spheroidal graphite cast iron grades - in which only the shades are taken into account. matrix ferritic, pearlitic and / or martensitic returned.

Pour les calculs selon la norme AGMA 6014 (respectivement 6114), références sont faites aux normes matériau ASTM A536 et ISO 1083. Les courbes donnant les contraintes admissibles en fonction de la dureté sont données jusqu'à 340HB environ. Mais pour les hautes duretés, il n'existe pas de nuances correspondantes dans les normes.For calculations according to the norm AGMA 6014 (respectively 6114), references are made to the standards material ASTM A536 and ISO 1083. The curves giving the admissible stresses according to the hardness are given up to about 340HB. But for high hardness, there are no corresponding nuances in the standards.

Les nuances de fonte actuelles permettent d'obtenir au mieux des duretés de 320HB sur des couronnes dentées. Pour les très fortes puissances, elles arrivent à leur limite d'utilisation et la seule solution actuellement est de changer de matériau en passant à l'acier moulé. Les duretés de 320HB des fontes actuelles sont obtenues par trempe suivie de revenu.The current melting grades make it possible to obtain at best hardnesses of 320HB on toothed crowns. For the very strong powers, they reach their limit of use and the only solution currently is to change material by passing to the molded steel. The hardnesses of 320HB of current fonts are obtained by quenching followed by income.

Il existe aussi des nuances selon EN 1564 - nuances de fonte à graphite sphéroïdal obtenues par trempe étagée, dite fontes ADI - pour lesquelles les valeurs des σHlim et σflim sont aussi définies en fonction de fourchettes de duretés. La trempe étagée est réalisée dans un bain de sels. Pour réaliser des couronnes dentées, il faudrait s'équiper de bacs de grandes dimensions.There are also grades according to EN 1564 - grades of spheroidal graphite cast iron obtained by stepped quenching, known as ADI fonts - for which the values of σ Hlim and σ flim are also defined according to hardness ranges. The steep quenching is carried out in a bath of salts. To make toothed crowns, it would be necessary to equip large tanks.

L'invention a pour but de permettre la fabrication d'une pièce en fonte dont la puissance transmissible est importante. En particulier, l'invention a pour objet de permettre la fabrication d'une pièce en fonte, telle qu'une couronne dentée, notamment de grande dimension, en fonte à graphite sphéroïdal. L'objectif est de mettre au point une nuance d'alliage qui atteint ces critères en particulier avec des moyens de traitement thermique simples et économiques.The invention aims to allow the manufacture of a cast iron part whose transmittable power is important. In particular, the object of the invention is to enable the manufacture of a cast iron part, such as a ring gear, especially of large size, made of spheroidal graphite cast iron. The objective is to develop a alloy grade that meets these criteria especially with simple and economical heat treatment means.

A cet effet, l'invention a pour objet un alliage tel qu'indiqué dans la revendication 1.For this purpose, the subject of the invention is an alloy as indicated in claim 1.

Selon des modes particuliers de réalisation, l'alliage comporte l'une ou plusieurs des caractéristiques indiquées dans les revendications 2 à 8.According to particular embodiments, the alloy comprises one or more of the features indicated in claims 2 to 8.

L'invention a également pour objet une pièce qui est fabriquée en un alliage tel que décrit précédemment et qui est définie dans les revendications 9 et 10.The invention also relates to a part which is made of an alloy as described above and which is defined in claims 9 and 10.

L'invention concerne également des procédés de fabrication d'une pièce qui sont définies dans les revendications 11 à 13.The invention also relates to methods of manufacturing a part which are defined in claims 11 to 13.

L'invention sera mieux comprise à la lecture de la description qui va suivre, donnée uniquement à titre d'exemple.The invention will be better understood on reading the description which follows, given solely by way of example.

L'invention a pour objet un alliage de fonte à graphite sphéroïdal. Il permet d'obtenir des duretés élevées et donc des contraintes admissibles élevées, notamment sur des pièces de grande taille.The invention relates to a spheroidal graphite cast iron alloy. It makes it possible to obtain high hardness and therefore high allowable stresses, especially on large parts.

La pièce est par exemple une roue dentée ou une couronne dentée. La pièce est de préférence une pièce de grande dimension, à savoir ayant une dimension la plus grande de la pièce d'au moins 2000mm. De préférence, la pièce a un diamètre extérieur d'au moins 2000mm, ou d'au moins 3000mm, ou d'au moins 6000mm. L'épaisseur axiale, généralement la largeur de denture, la plus large de la pièce est par exemple d'au moins 150mm, ou d'au moins 250mm, ou d'au moins 550mm. Une couronne dentée selon l'invention a une épaisseur de jante d'au moins 80mm ou d'au moins 120mm ou d'au moins 150mm et un module d'au moins 10 ou d'au moins 16 ou d'au moins 22 ou d'au moins 25.The piece is for example a toothed wheel or a ring gear. The workpiece is preferably a large workpiece, namely having a larger dimension of the workpiece of at least 2000mm. Preferably, the part has an outside diameter of at least 2000mm, or at least 3000mm, or at least 6000mm. The axial thickness, generally the width of teeth, the widest part is for example at least 150mm, or at least 250mm, or at least 550mm. A ring gear according to the invention has a rim thickness of at least 80 mm or at least 120 mm or at least 150 mm and a modulus of at least 10 or at least 16 or at least 22 or at least 25.

De préférence, la dureté élevée est obtenue avec un traitement thermique de revenu. La dureté dépend de la composition de l'alliage et éventuellement des différents traitements thermiques que la pièce subit au cours de son élaboration, que ce soit lors du refroidissement après la coulée ou des passages au four ultérieurs.Preferably, the high hardness is obtained with a heat treatment of income. The hardness depends on the composition of the alloy and possibly the different heat treatments that the part undergoes during its preparation, whether during cooling after casting or subsequent baking.

Toutes les indications sont données par la suite en % en poids du poids total.All indications are given later in% by weight of the total weight.

Un premier aspect de l'invention est la composition chimique de l'alliage.A first aspect of the invention is the chemical composition of the alloy.

L'alliage est une fonte à graphite sphéroïdal.The alloy is a spheroidal graphite cast iron.

Sa composition de base est le fer, des éléments d'addition et des impuretés inévitables. Les éléments d'addition sont le carbone (C), le silicium (Si), et le magnésium (Mg). L'élément qui constitue le reste de l'alliage est donc le Fer (Fe).Its basic composition is iron, addition elements and unavoidable impurities. The addition elements are carbon (C), silicon (Si), and magnesium (Mg). The element that constitutes the rest of the alloy is therefore iron (Fe).

Généralement, l'alliage comprend, outre la composition de base, du Nickel (Ni) entre 3,5% et 7%, du Cuivre (Cu) entre 0,5% et 3% et du Molybdène (Mo) entre 0,15% et 1%.Generally, the alloy comprises, in addition to the base composition, nickel (Ni) between 3.5% and 7%, copper (Cu) between 0.5% and 3% and molybdenum (Mo) between 0.15 % and 1%.

De plus, l'alliage peut comprendre du manganèse (Mn) jusqu'à 1% ou jusqu'à 0,8%.In addition, the alloy may comprise manganese (Mn) up to 1% or up to 0.8%.

De plus, l'alliage peut comprendre du chrome (Cr) jusqu'à 0,4%.In addition, the alloy may comprise chromium (Cr) up to 0.4%.

De plus, l'alliage peut comprendre du carbone (C) entre 2,5% et 4% et du silicium (Si) entre 1,5% et 4,4%.In addition, the alloy may comprise carbon (C) between 2.5% and 4% and silicon (Si) between 1.5% and 4.4%.

La teneur en Nickel (Ni) de l'alliage peut être au moins 3,5%, 4%, 4,1%, 4,2%, 4,3%, 4,4%, 4,5%, ou 4,8% et au plus 7%, 6,5%, 6%, ou 5,8%.The nickel (Ni) content of the alloy may be at least 3.5%, 4%, 4.1%, 4.2%, 4.3%, 4.4%, 4.5%, or 4%. , 8% and not more than 7%, 6.5%, 6%, or 5.8%.

La teneur en Molybdène (Mo) peut être comprise entre au moins 0,15%, 0,25%, ou 0,3% et au plus 1%, 0,8%, ou 0,5%.The content of molybdenum (Mo) can be between at least 0.15%, 0.25%, or 0.3% and at most 1%, 0.8%, or 0.5%.

La teneur en Cuivre (Cu) peut être comprise entre au moins 0,5%, 1 %, ou 1,5%, et au plus 3%, 2,5%, ou 2,2%.The copper content (Cu) may be at least 0.5%, 1%, or 1.5%, and at most 3%, 2.5%, or 2.2%.

Il est à noter que les limites inférieures et supérieures des teneurs ci-dessus sont indépendantes les unes des autres. La teneur en Nickel peut donc par exemple être comprise entre 4,4% et 7%.It should be noted that the lower and upper limits of the contents above are independent of each other. The nickel content may therefore for example be between 4.4% and 7%.

La teneur en Carbone (C) peut être comprise entre 3% et 3,6%.The carbon content (C) can be between 3% and 3.6%.

La teneur en Silicium (Si) peut être comprise entre 1,8% et 2,4%.The silicon content (Si) can be between 1.8% and 2.4%.

La teneur en Chrome (Cr) peut être inférieure à 0,2%.The chromium (Cr) content may be less than 0.2%.

La teneur en Manganèse (Mn) peut être supérieure à 0,2%.The Manganese content (Mn) may be greater than 0.2%.

L'alliage selon l'invention peut consister de ces éléments ci-dessus, sachant que le Manganèse (Mn), et/ou le Chrome (Cr) et/ou le Phosphore (P) et/ou le Soufre (S) est/sont un/des élément(s) optionnel(s) ou présent(s) en traces.The alloy according to the invention can consist of these elements above, knowing that Manganese (Mn), and / or Chromium (Cr) and / or Phosphorus (P) and / or Sulfur (S) is / are optional element (s) or present (s) in traces.

Selon l'exemple, l'alliage comprend outre le fer (Fe) et les impuretés inévitables, les éléments suivants, dans les limites indiquées : C Si Ni Mo Cu Mn Cr Mg P S Mini 2,5 1,5 3,5 0,15 0,5 0,02 maxi 4 4,4 7 1 3 1 0,4 0,1 0,04 0,015 According to the example, the alloy comprises in addition to iron (Fe) and unavoidable impurities, the following elements, within the limits indicated: VS Yes Or MB Cu mn Cr mg P S mini 2.5 1.5 3.5 0.15 0.5 0.02 max 4 4.4 7 1 3 1 0.4 0.1 0.04 0,015

A titre d'exemple, la dureté qui peut être obtenue par l'alliage selon l'invention est indiquée ci-après, en fonction de la composition chimique, outre la composition de base : Ni Mo Cu C Si Mn HB 320 4,3-5,6 0,3-0,45 1,5-2 3,3-3,45 1,8-2 0,3-0,6 HB 330 4,6-5,9 0,3-0,45 1,5-2 3,3-3,45 1,8-2 0,3-0,6 HB 340 4,7-6 0,3-0,45 1,5-2 3,3-3,45 1,8-2 0,3-0,6 HB 350 4,8-6,1 0,35-0,5 1,5-2 3,3-3,45 1,8-2 0,3-0,6 HB 360 4,9-6,2 0,35-0,5 1,5-2 3,3-3,45 1,8-2 0,3-0,6 By way of example, the hardness that can be obtained by the alloy according to the invention is indicated below, depending on the chemical composition, in addition to the base composition: Or MB Cu VS Yes mn HB 320 4.3 to 5.6 0.3 to 0.45 1,5-2 3.3 to 3.45 1.8-2 0.3-0.6 HB 330 4.6 to 5.9 0.3 to 0.45 1,5-2 3.3 to 3.45 1.8-2 0.3-0.6 HB 340 4.7 to 6 0.3 to 0.45 1,5-2 3.3 to 3.45 1.8-2 0.3-0.6 HB 350 4.8 to 6.1 0.35-0.5 1,5-2 3.3 to 3.45 1.8-2 0.3-0.6 HB 360 4.9 to 6.2 0.35-0.5 1,5-2 3.3 to 3.45 1.8-2 0.3-0.6

Un second aspect de l'invention est le procédé de fabrication d'une pièce en un alliage selon l'invention.A second aspect of the invention is the method of manufacturing a part made of an alloy according to the invention.

Tout d'abord la pièce est coulée dans un moule.First of all the piece is cast in a mold.

Une fois la pièce coulée, elle subit un refroidissement, notamment lent, dans son moule, notamment jusqu'à la température ambiante (<50°C). Puis la pièce subit un traitement thermique. Le terme « lent » signifie inférieur à 100°C/h, 80°C/h ou 50°C/h. Le refroidissement lent a de préférence lieu sur toute la durée du refroidissement.Once the casting, it undergoes cooling, especially slow, in its mold, especially up to room temperature (<50 ° C). Then the piece undergoes heat treatment. The term "slow" means less than 100 ° C / h, 80 ° C / h or 50 ° C / h. Slow cooling preferably takes place throughout the cooling period.

Le traitement thermique consiste en un revenu. C'est un traitement thermique dans la masse, il permet d'obtenir la dureté souhaitée et indiquée ci-dessus sur toute l'épaisseur de la pièce. La dureté ne s'étend donc pas seulement sur quelques millimètres en surface.Heat treatment is income. It is a heat treatment in the mass, it allows to obtain the desired hardness and indicated above over the entire thickness of the room. The hardness therefore does not extend only a few millimeters on the surface.

La pièce est ensuite usinée, notamment par tournage et dans le cas d'une couronne dentée, les dents sont taillées.The workpiece is then machined, in particular by turning and in the case of a ring gear, the teeth are cut.

La dureté HB de l'alliage selon l'invention, et notamment de la fonte à graphite sphéroïdal, est comprise entre 320HB et 400HB. La pièce en cet alliage permet ainsi de transmettre de très fortes puissances.The HB hardness of the alloy according to the invention, and in particular of spheroidal graphite cast iron, is between 320HB and 400HB. The piece made of this alloy thus makes it possible to transmit very high powers.

La structure métallographique obtenue de l'alliage est composée de 90% de nodules de type VI ou V (suivant EN ISO 945-1) et d'une matrice bainitique pouvant comporter de l'austénite résiduelle (jusqu'à 10%), des carbures (jusqu'à 5%), de la martensite revenue (jusqu'à 5%) et de la perlite (jusqu'à 20%).The metallographic structure obtained from the alloy is composed of 90% type VI or V nodules (according to EN ISO 945-1) and a bainitic matrix that may contain residual austenite (up to 10%), carbides (up to 5%), restored martensite (up to 5%) and perlite (up to 20%).

Les caractéristiques obtenues sur échantillon coulé côte à côte sont les suivantes : Epaisseur (mm) Propriétés Mécaniques Echantillon Limite à la rupture (MPa) Limite d'élasticité à 0.2 min. (MPa) Allongement min. (%) Résistance limite de fatigue pied de dent σFlim (N/mm2) Résistance limite de fatigue flanc de dent σHlim (N/mm2) Echantillon 1 (Type HB 320) ≥80 850 570 1 256-330 730-840 Echantillon 2 (Type HB 330) ≥80 860 580 1 259-306 745-855 Echantillon 3 (Type HB 340) ≥80 880 600 1 263-310 760-870 Echantillon 4 (Type HB 350) ≥80 890 610 1 267-314 775-885 Echantillon 5 (Type HB 360) ≥80 910 630 1 271-318 790-900 The characteristics obtained on a sample cast side by side are as follows: Thickness (mm) Mechanical properties Sample Limit at break (MPa) Yield strength at 0.2 min. (MPa) Elongation min. (%) Limit fatigue resistance tooth root σ Flim (N / mm 2 ) Limit fatigue strength tooth flank σ Hlim (N / mm 2 ) Sample 1 (Type HB 320) ≥80 850 570 1 256-330 730-840 Sample 2 (Type HB 330) ≥80 860 580 1 259-306 745-855 Sample 3 (Type HB 340) ≥80 880 600 1 263-310 760-870 Sample 4 (Type HB 350) ≥80 890 610 1 267-314 775-885 Sample 5 (Type HB 360) ≥80 910 630 1 271-318 790-900

Les résistances limites de fatigue sont données pour un calcul suivant ISO 6336.The fatigue limit resistances are given for a calculation according to ISO 6336.

Claims (13)

Alliage de fonte à graphite sphéroïdal comprenant, en % de poids, outre des éléments d'addition, les éléments suivants : - Nickel (Ni) entre 3,5% et 7%, - Cuivre (Cu) entre 0,5% et 3%, - Molybdène (Mo) entre 0,15 et 1 %,
le reste étant du fer (Fe) et des impuretés inévitables. Spheroidal graphite cast iron alloy comprising, in% by weight, in addition to addition elements, the following elements: - nickel (Ni) between 3.5% and 7%, - Copper (Cu) between 0.5% and 3%, - Molybdenum (Mo) between 0.15 and 1%,
the rest being iron (Fe) and unavoidable impurities. Alliage suivant la revendication 1, dans lequel les éléments d'addition comprennent : - Carbone (C) entre 2,5% et 4% et/ou - Silicium (Si) entre 1,5% et 4,4%. An alloy according to claim 1, wherein the addition elements comprise: - Carbon (C) between 2.5% and 4% and / or - Silicon (Si) between 1.5% and 4.4%. Alliage selon les revendications 1 ou 2 dans lequel les éléments d'addition comprennent, - Magnésium (Mg) entre 0,02% et 0,1 %. An alloy according to claims 1 or 2 wherein the addition elements comprise - Magnesium (Mg) between 0.02% and 0.1%. Alliage selon l'une quelconque des revendications 1 à 3, comprenant : - Manganèse (Mn) ≤ 1% ou ≤ 0,8%. An alloy according to any one of claims 1 to 3, comprising: - Manganese (Mn) ≤ 1% or ≤ 0.8%. Alliage selon l'une quelconque des revendications précédentes, comprenant : - Chrome (Cr) ≤ 0,4% et/ou - Phosphore (P) ≤ 0,04% et/ou - Soufre (S) ≤ 0,015%. An alloy according to any one of the preceding claims comprising: - Chromium (Cr) ≤ 0.4% and / or - Phosphorus (P) ≤ 0.04% and / or - Sulfur (S) ≤ 0.015%. Alliage selon l'une quelconque des revendications précédentes, comprenant : - Nickel (Ni) au moins 3,5%, 4%, 4,1%, 4,2%, 4,3%, 4,4%, 4,5%, ou 4,8% et au plus 7%, 6,5%, 6%, ou 5,8%. An alloy according to any one of the preceding claims comprising: - Nickel (Ni) at least 3.5%, 4%, 4.1%, 4.2%, 4.3%, 4.4%, 4.5%, or 4.8% and not more than 7% , 6.5%, 6%, or 5.8%. Alliage selon l'une quelconque des revendications précédentes, comprenant : - Cuivre (Cu) au moins 0,5%, 1 %, ou 1,5% et au plus 3%, 2,5%, ou 2,2%. An alloy according to any one of the preceding claims comprising: - Copper (Cu) at least 0.5%, 1%, or 1.5% and not more than 3%, 2.5%, or 2.2%. Alliage selon l'une quelconque des revendications précédentes, comprenant : - Molybdène (Mo) au moins 0,15%, 0,25%, ou 0,3% et au plus 1%, 0,8%, ou 0,5%. An alloy according to any one of the preceding claims comprising: - Molybdenum (Mo) at least 0.15%, 0.25%, or 0.3% and not more than 1%, 0.8%, or 0.5%. Pièce fabriquée en un alliage, caractérisée en ce que l'alliage est un alliage selon l'une quelconque des revendications précédentes, et notamment la pièce étant une roue dentée et en particulier une couronne dentée.Part made of an alloy, characterized in that the alloy is an alloy according to any one of the preceding claims, and in particular the part being a toothed wheel and in particular a ring gear. Pièce selon la revendication 9, caractérisée en ce que la pièce est une pièce de grande dimension, à savoir ayant une dimension la plus grande de la pièce d'au moins 2000mm.Part according to claim 9, characterized in that the workpiece is a workpiece of large size, ie having a largest dimension of the part of at least 2000mm. Procédé de fabrication d'une pièce selon les revendications 9 ou 10, caractérisé par les étapes suivantes : - couler une pièce brute de fonderie dans un moule, - laisser refroidir la pièce brute de fonderie, notamment dans le moule, en obtenant la pièce. A method of manufacturing a part according to claims 9 or 10, characterized by the following steps: - casting a blank casting in a mold, - Let cool the foundry blank, especially in the mold, by getting the piece. Procédé selon la revendication 11, dans lequel la pièce brute de fonderie est thermiquement traitée, en particulier par un revenu.The method of claim 11, wherein the casting is thermally treated, particularly by income. Procédé selon l'une des revendications 11 ou 12, dans lequel l'étape de laisser refroidir la pièce est une étape de refroidissement lent, notamment inférieur à 100°C/h, 80°C/h ou 50°C/h.Method according to one of claims 11 or 12, wherein the step of cooling the room is a slow cooling step, especially less than 100 ° C / h, 80 ° C / h or 50 ° C / h.
EP13176453.2A 2012-07-23 2013-07-15 Alloy, corresponding part and manufacturing method Active EP2690187B1 (en)

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US20190264304A1 (en) * 2016-11-18 2019-08-29 Michigan Technological University Ductile iron alloys and materials including a thin-wall layer of a ductile iron alloy
RU2733940C1 (en) * 2020-03-02 2020-10-08 Денис Александрович Габец Iron
CN114807734A (en) * 2022-05-18 2022-07-29 广东美芝制冷设备有限公司 Nodular cast iron, piston, preparation method of piston and compressor

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RU2013134326A (en) 2015-01-27
CL2013002076A1 (en) 2014-05-16
CN103572148A (en) 2014-02-12
CA2831047C (en) 2020-10-13
FR2993575A1 (en) 2014-01-24
KR102194086B1 (en) 2020-12-22
AU2013204216A1 (en) 2014-02-06
PE20141290A1 (en) 2014-10-17
KR20140012898A (en) 2014-02-04
US10266927B2 (en) 2019-04-23
RU2647960C2 (en) 2018-03-21
DK2690187T3 (en) 2020-04-06
EP2690187B1 (en) 2020-02-12
CA2821043A1 (en) 2014-01-23
ES2774225T3 (en) 2020-07-17
AU2013204216B2 (en) 2015-12-24
EP2690187A3 (en) 2016-01-27
FR2993575B1 (en) 2016-07-22
PL2690187T3 (en) 2020-08-10
US20140023548A1 (en) 2014-01-23
CA2831047A1 (en) 2014-01-23

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