Commentary titanium processing
Titanium alloys, titanium parts used in the processing of titanium-based alloy is added to other elements of the alloy. Titanium machining titanium parts used in two allomorphs: Titanium is allotrope, a melting point of 1720 ℃, showed a close-packed hexagonal lattice structure called α titanium at temperatures below 882 ℃; in 882 body-centered cubic structure ℃ above character was called β titanium. The different characteristics of the two by using titanium structure, machining add the appropriate alloying elements, so that the phase transition temperature and relative content of gradual change and get different organizations titanium (itaniumalloys).
Machining titanium alloys used in titanium - alloy elements
Titanium alloy elements according to their influence on the phase transition temperature can be divided into three categories: ① stable α phase, improving the phase transition temperature of the element is α stabilizing element, aluminum, carbon, oxygen and nitrogen. Wherein the aluminum alloy is the main alloying elements, improve its normal and high temperature strength of the alloy, reduce the proportion, increase elasticity modulus had a marked effect. ② stable β phase, the phase transition temperature of the lower element of β stabilizing element, can be divided into the same crystal type and eutectoid type two kinds. Former molybdenum, niobium, vanadium; the latter are chromium, manganese, copper, iron, silicon and the like. ③ small element of the phase transition temperature of the neutral element, zirconium and tin.
Machining oxygen, nitrogen, carbon and hydrogen are the main impurities in titanium. Oxygen and nitrogen in the α phase has a greater solubility of titanium alloys have a significant strengthening effect, but the plastic drop. Usually it provides the titanium content of oxygen and nitrogen, respectively 0.15-0.2% and 0.04-0.05% or less. The solubility of hydrogen in the α phase is very small, titanium dissolved hydrogen will produce excess hydride, the alloy becomes brittle. Titanium is usually controlled hydrogen content of 0.015% or less. Dissolved hydrogen in titanium is reversible, vacuum annealing can be used
NEWS FROM CNC MACHINING PARTS COMPANY EASTAR
