Abstract: A cold rolled and annealed steel sheet includes by weight: 0.6?C?1.3%, 15.0?Mn?35%, 5?Al?15%, Si?2.40%, S?0.03%, P?0.1%, N?0.1%, possibly one or more optional elements chosen among Ni, Cr and Cu in an respective amount of up to 4.0%, up to 3.0% and up to 3.0% and possibly one or more elements chosen among B, Ta, Zr, Nb, V, Ti, Mo, and W in a cumulated amount of up to 2.0%, the remainder of the composition making up of iron and inevitable impurities resulting from the elaboration, the microstructure of the sheet including optionally up to 3% of kappa carbides, optionally up to 10.0% of granular ferrite, the remainder being made of austenite, the average grain size and average aspect ratio of the austenite being respectively below 6 ?m and comprised between 1.5 and 6 and the average grain size and average aspect ratio of the ferrite, when present, being respectively below 5 ?m and below 3.0.

Abstract: A cold rolled and annealed steel sheet includes by weight: 0.6<C<1.3%,15.0<Mn<35%, 6.0<Al<15%, Si<2.40%, S<0.015%, P<0.1%, N<0.1%, iron and inevitable impurities, optionally one or more of Ni, Cr and Cu in an individual amount of up to 3% and optionally one or more of B, Ta, Zr, Nb, V, Ti, Mo, and W in a cumulated amount of up to 2.0%, a microstructure of the sheet comprising at least 0.1% of intragranular kappa carbides, at least 80% of the kappa carbides have an average size below 30 nm, the remainder being made of austenite, an average grain size of the austenite being below 6 ?m, an average aspect ratio of the austenite being between 1.5 and 6, an average grain size of the ferrite, when present being below 5 ?m, and an average aspect ratio of the ferrite, when present, being below 3.0.

Abstract: A cold rolled and heat-treated steel sheet having a composition including, by weight percent: C 0.3-0.4%, Mn 2.0-2.6%, Si: 0.8-1.6%, Al 0.01-0.6%, Mo 0.15-0.5%, Cr 0.3-1.0%, Nb?0.06%, Ti?0.06%, Ni?0.8%, S?0.010%, P?0.020% and N?0.008%, the remainder of the composition being iron and unavoidable impurities resulting from the smelting, and having a microstructure consisting of, in surface fraction: between 15% and 30% of retained austenite, said retained austenite having a carbon content of at least 0.7%, between 70% and 85% of tempered martensite, at most 5% of fresh martensite and at most 5% of bainite. It also deals with a manufacturing method thereof.

Abstract: A method for manufacturing a high-strength sheet having improved formability and ductility accord which the chemical composition of the steel contains, in percent by weight: 0.25%<C?0.4% 2.3%?Mn?3.5% 2.3%?Si?3% Al?0.040% the remainder being Fe and unavoidable impurities, the method comprising the steps of annealing a rolled sheet made of said steel by soaking it at an annealing temperature AT higher than the Ac3 transformation point of the steel, quenching the sheet by cooling it down to a quenching temperature QT between Ms?65° C. and Ms?115° C., being in order to obtain a final structure containing at least 65% of martensite and at least 5% of residual austenite, the sum of the ferrite and bainite contents being less than 10%, Ms being the Ms transformation point of the steel according to the Andrews formula, heating the sheet up to an overaging temperature PT between 360° C. and 500° C.

Abstract: A cold rolled and annealed steel sheet includes by weight: 0.6?C?1.3%, 15.0?Mn?35%, 5?Al?15%, Si?2.40%, S?0.03%, P?0.1%, N?0.1%, possibly one or more optional elements chosen among Ni, Cr and Cu in an respective amount of up to 4.0%, up to 3.0% and up to 3.0% and possibly one or more elements chosen among B, Ta, Zr, Nb, V, Ti, Mo, and W in a cumulated amount of up to 2.0%, the remainder of the composition making up of iron and inevitable impurities resulting from the elaboration, the microstructure of said sheet comprising optionally up to 3% of kappa carbides, optionally up to 10.0% of granular ferrite, the remainder being made of austenite, the average grain size and average aspect ratio of the austenite being respectively below 6 ?m and comprised between 1.5 and 6 and the average grain size and average aspect ratio of the ferrite, when present, being respectively below 5 ?m and below 3.0.

Abstract: A cold rolled and annealed steel sheet includes by weight: 0.6<C<1.3%, 15.0?Mn<35%, 6.0?Al<15%, Si?2.40%, S?0.015%, P?0.1%, N?0.1%, optionally one or more elements chosen among Ni, Cr and Cu in an individual amount of up to 3% and optionally one or more elements chosen among B, Ta, Zr, Nb, V, Ti, Mo, and W in a cumulated amount of up to 2.0%, the remainder of the composition making up of iron and inevitable impurities resulting from elaboration, a microstructure of said sheet comprising at least 0.1% of intragranular kappa carbides, wherein at least 80% of said kappa carbides have an average size below 30 nm, optionally up to 10% of granular ferrite, the remainder being made of austenite, an average grain size of the austenite being below 6 ?m, an average aspect ratio of the austenite being between 1.5 and 6, an average grain size of the ferrite, when present being below 5 ?m, and an average aspect ratio of the ferrite, when present, being below 3.0.

Abstract: A method for manufacturing a high-strength sheet having improved formability and ductility accord which the chemical composition of the steel contains, in percent by weight: 0.25%<C?0.4% 2.3%?Mn?3.5% 2.3%?Si?3% Al?0.040% the remainder being Fe and unavoidable impurities, the method comprising the steps of annealing a rolled sheet made of said steel by soaking it at an annealing temperature AT higher than the Ac3 transformation point of the steel, quenching the sheet by cooling it down to a quenching temperature QT between Ms?65° C. and Ms?115° C., being in order to obtain a final structure containing at least 65% of martensite and at least 5% of residual austenite, the sum of the ferrite and bainite contents being less than 10%, Ms being the Ms transformation point of the steel according to the Andrews formula, heating the sheet up to an overaging temperature PT between 360° C. and 500° C.

Abstract: A landing aid device for an aircraft generates video images of a portion of the field of vision using a sensor situated in front of the aircraft intended for picture-taking during poor visibility conditions, and extracts contours from the video images making it possible to delimit at least one first known shape included in each image. A first head up display includes a display zone, which occupies a portion of the visor of the cockpit superimposed on the exterior landscape, and a symbology for generating information representing symbols intended to aid piloting is displayed on the display, wherein at least one first symbol comprising landing aid information is generated on the basis of the contours of the first shape and displayed on the display.

Abstract: A landing aid device for an aircraft includes: means for generating video images of a portion of the field of vision, the device comprising a sensor situated in front of the aircraft intended for picture-taking during poor visibility conditions; means for extracting contours of video images delivered by the means for generating images making it possible to delimit at least one first known shape included in each image; a first head up display, a display zone of which occupies a portion of the visor of the cockpit superimposed on the exterior landscape; and means for generating a symbology for generating information representing symbols intended to aid piloting and displayed on the display, wherein at least one first symbol comprising landing aid information is generated on the basis of the contours of the first shape and displayed on the display.

Abstract: The field of the invention is that of securing the necessary piloting information for aircraft cockpits. The invention relates to a head-up display for aircraft, characterized in that it comprises means of calculating a “PFD” type symbology comprising at least the speed, altitude and attitude information, the display symbology being able to be specifically adapted to cope with cockpit smoke or fire conditions.

Abstract: The field of the invention is that of the generation of the standby function in aircraft cockpits. The term “standby” is the widely used English term for such a function. The invention relates to a device for generating the standby function for an aircraft. The device has inertia and pressure measuring sensors; electronic processing means are provided to process the data from the sensors; calculation means generate a graphical symbology representative of altitude, airspeed and attitude of the aircraft. Display means display the symbology belonging to a Head-up Display and making it possible to generate a collimated image overlaid on the external scene.