Performance analysis of titanium alloy forgings and titanium alloy castings
After metal is forged, its structure and mechanical properties can be improved. After the casting structure is deformed by hot processing by the forging method, due to the deformation and recrystallization of the metal, the original coarse dendrites and columnar grains change into an equiaxed recrystallization structure with finer grains and uniform size, causing the original segregation and recrystallization in the steel ingot. The compaction and welding of loose parts, pores, slag inclusions, etc. make the overall structure tighter and improve the good plasticity and mechanical properties of titanium metal.
Generally speaking, the mechanical properties of castings are lower than the mechanical properties of forgings of the same material. Forging processing can enhance the continuity of the metal fiber structure, keep the fiber structure of the forging consistent with the shape of the forging, and keep the metal streamlines intact, ensuring that the parts have good mechanical properties and long service life. Precision die forging and cold extrusion are used. Forgings produced by pressing, warm extrusion and other processes are incomparable to castings.
1. Aircraft forgings
Calculated by weight, about 85% of the components on the aircraft are forgings. The aircraft engine's turbine disk, rear journal (hollow shaft), blades, wing spars, fuselage rib plates, wheel brackets, and inner and outer cylinders of the landing gear are all important forgings related to aircraft safety. Aircraft forgings are mostly made of titanium alloys, corrosion-resistant aluminum alloys, high-strength wear-resistant, nickel-based alloys and other precious materials. In order to save materials and energy, most aircraft forgings are produced using die forging or multi-directional die forging presses. Car forging Calculated by weight, there are 1719% forgings on the car. A general automobile consists of 15 components such as body, frame, engine, gearbox, steering system, front and rear axles, and transmission shaft. It is characterized by complex appearance and structure, relatively light weight, and high safety performance requirements. For example, the crankshaft, connecting rod, camshaft used in the automobile engine, the front beam required for the front axle, the steering knuckle, the half shaft used in the rear axle, the half axle sleeve, the transmission gear in the axle box, etc., are all related Security critical forgings for safe operation of automobiles.
2. Diesel engine forgings
Diesel engine is a type of power machinery, which is often used as an engine. Taking a large diesel engine as an example, the forgings used include cylinder head, main journal, crankshaft end flange output shaft, connecting rod, piston rod, piston head, crosshead pin, crankshaft transmission gear, ring gear, intermediate gear and dye oil pump. There are more than ten kinds of bodies.
3. Marine forgings
Marine forgings are mainly divided into three categories: main engine forgings, rudder forgings and shafting forgings. Main engine forgings and diesel engine forgings are basically similar. Shafting forgings include thrust shafts, intermediate shafts, stern shafts, etc. Rudder system forgings include rudder stock, rudder pin, rudder post, etc.
4. Weapon forgings
Forgings play an extremely important role in various weapons industries. By weight, 60% of the tank is forged parts. The barrel, muzzle brake and breech of artillery, the rifled barrel and triangular bayonet of infantry weapons, rocket and submarine depth bomb launchers and fixed seats, stainless steel valve bodies for high-pressure coolers of nuclear submarines, artillery shells, Guns, bullets, etc. are all forged products. In addition to steel forgings, other materials were used to create weapons.
5. Petrochemical forgings
Forgings are widely used in petrochemical equipment. Such as manholes and flanges of spherical storage tanks, various tube sheets required for heat exchangers, butt welding flanges, forged cylinders (pressure vessels) of catalytic cracking reactors, cylinder sections used in hydrogenation reactors, chemical fertilizers The top cover, bottom cover, head, etc. required for the equipment are all forged parts.
