www.melanexjou.fora.pl

[loiwtjsf]

Ultrasonic melt treatment on microstructure and properties of aluminum alloy


Rising water in the heat after the ultrasound,[link widoczny dla zalogowanych], according to the following formula to work out the ultrasonic power (P). P = (ClmlxAT + C2 / / / '2 xAT) / t (1) where, C, C2 are water and heat capacity than beaker. Because the amplitude of the end of the horn is always a certain value, so that the melt in the transmission of ultrasonic energy is constant, that the power change. Test data: Cl = 4.186J / (g · cI =), c2 = 1.051J / (g. CI =), AT = 1cI =, ml = 300g, m2 = 186.5g,[link widoczny dla zalogowanych], t = 360S, according to The data calculated P = 4.0W. 1.3 Heat Treatment on the casting temperature of the sample resistance furnace with silicon (the temperature error National Key Basic Research Development Program of China G1999064900 and the military supporting the project MKP'r of a 03-148 ** Wen Hu, male, born in 1979 , MS,[link widoczny dla zalogowanych], Central South University, State Key Laboratory of powder metallurgy,[link widoczny dla zalogowanych], Changsha (410083), Tel :0731-8830714,[link widoczny dla zalogowanych], E-mail: [link widoczny dla zalogowanych] | l Received 13 :2004 -02-0911 Casting Taiwan 4, 2004 Gold deviation ± 1 ℃) for uniform treatment, the process is: 460 ℃ heat after 5h. The speed with 0.5/rain temperature to 470. ℃ and the heat l6h. And then to 0.5 ℃ / min heating rate to 473 and insulation 11h, cold water quenching. Take some kind of metallurgical production, and then melted down annealing at 4OO ℃ 20min after the furnace cooling under heat to produce stretch like. 1.4 Observation and mechanical properties of tissue for testing XJP-200 optical microscope enhanced uniform microstructure of quenched alloys were observed before. The sample in the 95t1Il water, 1n1L hydrofluoric acid. 15ml_ hydrochloric acid, 2.5mL mixture of nitric acid etching 8 ~ 15s with Inslron electronic tensile device for ultrasonic treatment of 670 samples and conventional cast and homogenized cast tensile test bars were annealed mechanical properties testing round diameter tensile specimen holding 8Flirt3, standard distance of 45nm. Analysis of the tensile breaking 151 in the X. SEM 650 2 Results and discussion on the alloy characteristics of 2.1 shown in Figure 2, the ultrasonic treatment of the alloy was significantly refined and uniform grain, often spy the ingot casting mold in the non-equilibrium solidification process. Finally, the solute enrichment of the region solidified, resulting in the formation of grain boundaries and a large number of non-equilibrium eutectic phase and the coarse second phase, after homogenization of coarse second phase of these there are still a lot of them can also be seen from the 630, 650 and 690 ℃ mainly as grain size is similar to ultrasound treatment, and ultrasonic treatment at 670 ℃ after perishable, especially small grains, under the conditions of 710 ℃ in a relatively thick, but more than the absence of ultrasound treatment to be small. Can be seen from Figure 2, after ultrasonic treatment significantly reduced the number of second phase particles. Bin a regular cast b. Tuen c. 630 650d670 ℃ e. 69 (} ℃ f.710 Wai 271) 55 aluminum-base quenching Kui homogenization of phases (b-f by the curvature of the 40w ultrasound treatment l5s) 2.2 Alloys for the 7055 Form】 molten aluminum Taijin ultrasonic treatment and without ultrasonic treatment under the conditions of the mechanical properties of cast samples compared. It can be seen by ultrasound treatment, the alloy cast elongation provided a 107% business, improve the elongation after heat treatment】 02%. The tensile strength cast about 18%. 12% increase in tensile strength after heat treatment. The mechanical properties of the table l7055 Taijin 23 SEM analysis in Figure 3 is a fracture of tensile samples scanned photos, samples were taken from the central region of Jones Lang La fracture. Shown that the fracture of the alloy in the 3 state to the tensile stress fracture. 3, tensile stress tends to make the brittle fracture characteristics: In addition, ultrasound treatment, and without ultrasonic treatment of the fracture surface is very similar to the session in the crystalline phase of fracture caused by grain boundary fracture within the fracture and fracture of mixed units in Figure 3 also shows part of 7055 alloy showing cleavage characteristics of the grain, after ultrasonic treatment. Refinement, this feature can be weakened in the high-power may be evident after ultrasonic treatment, and intensive small dimples. Without ultrasonic treatment of dimples large and sparse Ultrasonic Melt Treatment r grain refinement to improve coordination of the alloy deformed, making the product even grain deformation: ■ ■ YU Yang Huo 【] cc normal casting b670 body 40w ultrasound training site management l5s Figure 37055 all-aluminum SEM scan photos d. 1:2 break 670 ℃ l shake Stanford geographical 15B ultrasound pregnancy 40w

相关的主题文章：


[link widoczny dla zalogowanych]

[link widoczny dla zalogowanych]

[link widoczny dla zalogowanych]