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 Wysłany: Nie 14:49, 09 Sty 2011 Temat postu: moncler daunenjacke Two-phase process of titanium |
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Two-phase process of titanium alloy forging and heat treatment on microstructure and fatigue strength
Temperature is a key factor in the fire (Table 6). A 6AI 4V and a 6AI a 2Mo a 2Cr alloy in a 1250K annealing for 1 hour, is conducive to the formation of new recrystallized grains and flake n, increases in the recrystallization zone microstructure percentage of the two alloys were increased by 65 % and 67%. This can also be confirmed by microstructure analysis. Annealed at 1250K, the formation of new recrystallized grains and lamellar a phase. 4. A summary table 6Ti a 6AI 4V and _n a 6AI 2Mo a 2cr Taijin a deformation conditions and heat treatment without Si-degrees of recrystallization microstructure of a percentage of the n a 6AI 4V and Ti 6AI a 2Mo a one 2Cr (2 ) heat treatment on the impact of forging, the annealing temperature and alloy the experimental results,[link widoczny dla zalogowanych], we can get: (1) forging conditions,[link widoczny dla zalogowanych], namely temperature, deformation and cooling rate on the alloy composition, microstructure and fatigue strength. 12 degrees on the fatigue strength of alloys. A Ti 6AI 4V and Ti a one of a 2Cr alloy 6AI a 2Mo continuous cooling from the p zone microstructure obtained in the original sheet on the port phase is a gathering organizations have different phase \+ Ⅱ (a \titanium in a a + p 8 transition temperature, forging, are globular microstructure. in the original population by forging phase temperature zone lamellar structure. The study determined the fatigue strength depends on the type of microstructure of forging temperature and plastic deformation temperature. In 1t70K forging, Taijin the fatigue strength of a maximum m of a 6Ai 2Mo a 2Cr alloy 546MPa; Ti a 6AI 4V alloy for a 5HMPa). plastic deformation increases, the fatigue strength decreases. in the mouth zone of the fatigue strength properties of wrought reduce the degree and in the. + p District forging compared to the former than the latter small. the fatigue strength on heat treatment and forging. In annealing process of recovery and recrystallization occurred, resulting in fatigue intensity,[link widoczny dla zalogowanych], for example, in the 950 ~ C annealed 3 hours, there recovery process, most of the fatigue strength can be obtained (Tj a 6A | A 2Mo a 2CI Taijin 605MPa; Ti a 6M a 4V alloy 558MPa). After 1 hour annealing at 1250K, the percentage of that recrystallized reached 67%, resulting in reduced fatigue strength. Wang Hao Quoted (JournalofMatcriahProcessingT ~ hnobgr) .98.6. P.117-121 states, 3 \『fatigue crack growth in the Mountain State titanium metal matrix composites for aerospace applications in the future will be possible to replace the usually single alloy, because it is high, the unique mechanical properties, good damage tolerance. 20 years to study more for the interfacial microstructure of chemical compatibility and mechanical properties, but these systems are intricate and cost barriers to their development. The main and the rhyme is to reveal the complex in a special - a species 【0 / 90 '】 a 6AI a 4V (wt%) SCS 6 horizontal layers of a fatigue crack propagation properties of the film, this system development is the first supersonic aircraft rack for skin, the potential of non-single directional applications include the application of aero-engine drive shaft, which requires the diagonal and transverse lamellar lamellar (angleph, andcr0ssplylaminates) to evaluate the performance. In the present study 【o / 9 out system (fiber volume fraction 35%) In the test state (including the initial density of health sub-interval stress, test temperature and environment) bridged solder pot Ming share of the low volume. test materials used for SCS 6 silicon carbide fiber reinforced one [0/9t7】 horizontal cross A layered Ti 6AI 4V a complex, this material is the use of common alloy foil,[link widoczny dla zalogowanych], continuous enhancement in both directions,[link widoczny dla zalogowanych], through the foil of a foil of a line, fiber production, fiber volume fraction was 35%. Single-edge gap (Singleedgenotches) sample length 80n, Kuan 4I Ⅲ Ⅱ, thickness 2mm, the gap depth lmra, the gap cut into the vertical direction and Yu sip of the fiber direction parallel to the 90 fibers, marked as [O/9ff】, offal marked \that place and 90 with O 2 on the film with their rhyme pairing symmetry, thus making a total of 8 layers formed. fatigue test at 300 ℃ and 450 ℃, in the air and in vacuum \applied for a tough start in the 13 -
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