Snecma

Safran Aircraft Engines

Safran Landing Systems

Aubert & Duval

Hitachi Metals, Ltd.

Laurent Ferrer

Patrick Philipson

Claude Marcel Mons

Philippe Heritier

Nicolas Binot

Jean-Francois Laurent Chabot

Pascal Charles Emile Thoison

Takahiko Kamimura

Jean-François Laurent Chabot

Pascal Poulain

Bruno Vitorino Lopes

The invention relates to a method for manufacturing a metal ingot by continuous casting, comprising the following steps: S: melting the metal, S: transferring the liquid metal () by pouring it into a crucible (), S: moving the base plate () of the crucible (), S: progressive solidification of the liquid metal () from the base plate () of the crucible (), and S: during the step Sof moving the base plate (), applying a compression force to the metal () which is present between the base plate () and the side wall (), the compression force being applied along a second axis (X) parallel to the first axis (X) so as to deform the metal and to obtain an ingot () which has a smaller width (L).

Semi-continuous casting of an ingot with compression of the metal during solidification

A method of fabricating a low alloy steel ingot, the method including a) melting all or part of an electrode by a vacuum arc remelting method, the electrode, before melting, including iron and carbon, the melted portion of the electrode being collected in a crucible, thus forming a melt pool within the crucible; and b) solidifying the melt pool by heat exchange between the melt pool and a cooling fluid, the heat exchange applied serving to impose a mean solidification speed during step b) that is less than or equal to 45 &#x3bc;m/s and to obtain an ingot of low alloy steel.

Method for producing a low-alloy steel ingot

A method for manufacturing an ingot made of titanium-based metallic compound, includes providing raw material fragments; melting the raw material fragments into a liquid metal in at least one basin; keeping in the molten state the liquid metal in the at least one basin; pouring the liquid metal from the at least one basin into a crucible by overflow from the at least one basin into the crucible; forming an ingot by cooling of the liquid metal into the crucible; wherein the method further includes preheating the raw material fragments before the melting of the raw material fragments with a preheating temperature higher than or equal to 75% of the liquidus temperature of the raw material fragments, and lower less than the liquidus temperature of the raw material fragments.

Method for producing ingots consisting of a metal compound containing titanium

A device () for manufacturing a metal alloy blank by centrifugal casting of a molten metal alloy, comprising a centrifugal casting wheel (), the centrifugal casting wheel () being rotary about an axis of rotation (A) and comprising a mold () for receiving the molten metal alloy, the mold extending in a radial direction (R) with respect to the axis of rotation (A). The device () comprises at least one magnet arranged in such a way as to induce an electric current in the mold () during the rotation of the centrifugal casting wheel () about the axis of rotation (A).

Device and method for manufacturing a metal alloy blank by centrifugal casting

A production method of a maraging steel includes: the step of producing, by vacuum melting, a remelt electrode which comprises from 0.2 to 3.0% by mass of Ti and from 0.0025 to 0.0050% by mass of N; and the step of remelting the remelt electrode to produce a steel ingot having an average diameter of 650 mm or more; wherein the resulting maraging steel includes from 0.2 to 3.0% by mass of Ti.

Production method of maraging steel

The invention relates to a method for producing martensitic steel that comprises a content of other metals such that the steel can be hardened by an intermetallic compound and carbide precipitation, with an Al content of between 0.4% and 3%, comprising the following steps: The temperature Tis substantially lower than the martensitic transformation temperature Mf, and the time t during which said steel is kept in said cryogenic medium at a temperature Tfrom the moment when the hottest part of the steel reaches a temperature lower than the martensitic transformation temperature Mf is at least equal to a non-zero time t, the temperature T(in &#xb0; C.) and the time t(in hours) being linked by the equation T=&#x192;(t), the first derivative of the function &#x192; relative to t, &#x192;'(t), being positive, and the second derivative of &#x192; relative to t, &#x192;&#x2033;(t), being negative.

Cryogenic treatment of martensitic steel with mixed hardening

A method of fabricating a part () having a housing () that includes an opening () opening out in a free surface () of the part (). The method comprises the following steps:

Method for incorporating abradable material into a housing by isostatic pressing

A method of fabricating a part covered in an abradable coating (), the method comprising the following steps: a blank () for the part, the blank having a housing () opening out into the surface () of the blank (); filling the housing () with an abradable material in powder form; and hot rolling the blank () and the abradable material together so as to sinter the abradable material and cause it to adhere to the blank, in order to obtain an abradable coating ().

Method of manufacturing a component covered with an abradable coating

A method of fabricating a martensitic stainless steel including: 1) heating steel to a temperature higher than austenizing temperature of the steel, then quenching the steel until a hottest portion of the steel is at a temperature less than or equal to a maximum temperature, and greater than or equal to a minimum temperature, a cooling rate being sufficiently fast for austenite not to transform into a ferrito-perlitic structure; 2) performing a first anneal followed by cooling until the hottest portion of the steel is at a temperature less than or equal to the maximum temperature and greater than or equal to the minimum temperature; 3) performing a second anneal followed by cooling to ambient temperature; and at the end of each of 1) and 2), performing: &#x3c9;) as soon as temperature of the hottest portion of the steel reaches the maximum temperature, immediately heating the steel once more.

Martensitic stainless steel machineability optimization

The invention relates to a method of producing a martensitic steel comprising a content of other metals such that it can be hardened by intermetallic compound and carbide precipitation, with an Al content of between 0.4% and 3%. The heat shaping temperature of the last heat shaping pass of said steel is lower than the solubility temperature of the aluminum nitrides in the steel, and the treatment temperature for each potential heat treatment after said last heat shaping pass is lower than the solid-state solubility temperature of the aluminum nitrides in said steel.

Martensitic steel with mixed hardening

A method of fabricating a stainless martensitic steel includes a step of electroslag remelting of an ingot of the steel then a step of cooling the ingot. Before the skin temperature of the ingot falls below the martensitic transformation temperature Ms of the steel, the ingot from electroslag remelting is placed in a furnace with an initial temperature Tthat is then higher than the pearlitic transformation completion temperature on cooling, Ar, of the steel, the ingot undergoing a homogenization treatment in the furnace for at least a holding time t after which the temperature of the coldest point of the ingot has reached a homogenization temperature T, the holding time t being equal to at least one hour, with the homogenization temperature T being in the range approximately 900&#xb0; C. to the burning temperature of the steel.

Homogenization of martensitic stainless steel after remelting under a layer of slag

A method for manufacture of a compressor housing which is resistant to a titanium fire (burning titanium). A circular blank made of steel, or steel alloy, or superalloy which is incombustible in the presence of a titanium fire is hydroformed against a circular blank made from titanium or titanium alloy.

Method for the manufacture of a circular revolution thermomechanical part including a titanium-based load-bearing substrate lined with steel or superalloy, a turbomachine compressor housing which is resistant to titanium fire obtained according to this method

A method fabricating a stainless martensitic steel, including electroslag remelting then cooling an ingot of the steel, then at least one austenitic thermal cycle heating the ingot above its austenitic temperature followed by a cooling. During each cooling: if the cooling is not followed by an austenitic thermal cycle, holding the ingot at a holding temperature included in the ferritic-pearlitic transformation nose for a hold time longer than sufficient for transforming the austenite into a ferritic-pearlitic structure in the ingot as completely as possible at the holding temperature; if the cooling is followed by an austenitic thermal cycle, before its minimum temperature falls below the martensitic transformation start temperature, the ingot is either held throughout the period between the two austenitic thermal cycles at a temperature above the austenitic transformation completion temperature on heating, or held at the holding temperature included in the ferritic-pearlitic transformation nose.

Heat treatment of martensitic stainless steel after remelting under a layer of slag

The invention relates to a method of fabricating a stainless martensitic steel, comprising a step of electroslag remelting of an ingot of said steel then a step of cooling said ingot. Before the electroslag remelting step, the ingot undergoes vacuum degassing for a time that is sufficient to obtain a hydrogen content in the ingot of less than 3 ppm.

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Lieusaint, France

Laurent Ferrer