摘要:
A composition of matter is generally provided, in one embodiment, a titanium alloy comprising about 5 wt% to about 8 wt% aluminum; about 2.5 wt% to about 5,5 wt% vanadium; about 0.1 wt % to about 2 wt% of one or more elements selected from the group consisting of iron and molybdenum; about 0.01 wt% to about 0.2 wt% carbon; up to about 0.3 wt% oxygen; silicon and copper; and titanium. A turbine component is also generally provided, in one embodiment, that comprises an article made from a titanium alloy. Additional!)', methods are also generally provided for making an alloy component having a beta transus temperature and a titanium silicide solvus temperature.
摘要:
Provided is a hot-forged TiAl-based alloy of the present invention containing 40 to 45 atom% of Al and additive elements in the following composition ratio (A) or (B), and the balance Ti with inevitable impurities: (A) Nb: 7 to 9 atom%, Cr: 0.4 to 4.0 atom%, Si: 0.3 to 1.0 atom%, and C: 0.3 to 1.0 atom%; and (B) at least one of Cr: 0.1 to 2.0 atom%, Mo: 0.1 to 2.0 atom%, Mn: 0.1 to 4.0 atom%, Nb: 0.1 to 8.0 atom%, and V: 0.1 to 8.0 atom%. The TiAl-based alloy is characterized by having a fine structure of densely arranged lamella grains that are laminated alternately with a Ti 3 Al phase (±2-phase) and a TiAl phase (³-phase) and have an average grain size of 1 to 200 µm.
摘要:
The invention provide an ±-² titanium alloy article consisting of, in weight percentages, from 2.9 to 5.0 aluminium, from 2.0 to 3.0 vanadium, from 0.4 to 2.0 iron, from 0.2 to 0.3 oxygen, from 0.005 to 0.3 carbon, from 0.001 to 0.02 nitrogen, less than 0.5 of other elements, balance and incidental impurities, wherein the ±-² titanium alloy article is cold worked at a temperature no greater than 677°C (1250°F) and annealed, characterized in that the ±-² titanium alloy article in the cold worked and annealed condition exhibits, at room temperature, tensile strength of at least 827 MPa (120 KSI), ultimate tensile strength of at least 896 MPa (130 KSI), and elongation of at least 10%. The invention further provides a method of forming an article from an ±-² titanium alloy comprising hot working the ±-² titanium alloy at a temperature greater than 841°C (1600°F), cold working the ±-² titanium alloy at a temperature no greater than 677°C (1250°F), and annealing the ±-² titanium alloy.
摘要:
A fibre reinforced polymer (FRP) composite structure incorporates a woven preform containing tows of carbon or other advanced fibres (1,3) and wires (2,4) of shape memory alloy (SMA). The SMA wires are capable of absorbing much larger amounts of strain energy than the conventional components of FRP composites and hence enhance the impact resistance of the structure. The woven form incorporates the SMA into the structure in an optimum manner in terms of handling and performance.
摘要:
A casting mold (10) to cast a TiAl alloy includes a casting mold body (14) formed into a bottomed shape and provided with a cavity (12) into which a molten TiAl alloy is to be poured. The casting mold body (14) includes a reaction-resistant layer (16) provided on the cavity side, formed from a refractory material containing at least one of cerium oxide, yttrium oxide, and zirconium oxide, and configured to suppress a reaction with the molten TiAl alloy and a back-up layer (18) formed on the reaction-resistant layer (16). The back-up layer (18) includes a weakening layer (18a) formed from a refractory material including a silica material in a range from 80% by mass to 100% by mass inclusive, the silica material containing cristobalite in a range from 26% by mass to 34% by mass inclusive and the rest being fused silica, the weakening layer being designed to reduce casting mold strength and a shape-retention layer (18b) formed from a refractory material and designed to retain a casting mold shape.
摘要:
The present invention relates to a hard coating film that is formed on a substrate, that is provided with a layer (A) of which the composition is [Ti(BCN)] and a layer (B) of which the composition is [TiAl(CN)], [AlCr(CN)], [TiCrAlSi(CN)], or [TiSi(CN)], and that is characterized in that: a foundation layer comprising the layer (B) is formed on the substrate; an adhesion-reinforcing layer in which the layer (A) and the layer (B) are stacked repeatedly in an alternating manner is formed on the foundation layer; the thickness of the layer (A) increases compared to the foundation layer (2) side as the thickness of the adhesion-reinforcing layer increases; and the maximum thickness of the layer (A) is 20-50 nm. The hard coating film is formed on the substrate surface of a jig tool or the like, has high coating film hardness, and exhibits excellent adhesion and wear resistance during cutting and the like.
摘要:
Titanium alloys formed into a part or component used in applications where a key design criterion is the energy absorbed during deformation of the part when exposed to impact, explosive blast, and/or other forms of shock loading is described. The titanium alloys generally comprise a titanium base with added amounts of aluminum, an isomorphous beta stabilizing element such as vanadium, a eutectoid beta stabilizing element such as silicon and iron, and incidental impurities. The titanium alloys exhibit up to 70% or more improvement in ductility and up to a 16% improvement in ballistic impact resistance over a Ti-6Al-4V alloy, as well as absorbing up to 50% more energy than the Ti-6Al-4V alloy in Charpy impact tests. A method of forming a part that incorporates the titanium alloys and uses a combination of recycled materials and new materials is also described.
摘要:
A turbine engine rotor component has a Ti-based first member (66) circumscribing an axis (500) and has either a circumferential array of integrally formed airfoils (62) or a circumferential array of blade retention features. A TiB particulate reinforced second member (90) also circumscribes the axis.
摘要:
A method for forming a part having a dual property microstructure includes the steps of: forming a blank having a narrow top portion and a wide base portion; heating the blank to an elevated temperature; and forming a dual property microstructure in the blank by cooling different portions of the blank at different cooling rates.