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Rapid solidification microstructure and properties of titanium alloys

Author: LouJun
Tutor: ZhangJun
School: Shenyang University
Course: Materials Science
Keywords: Rapid Prototyping TC18 Columnar grain structure Tensile properties
CLC: TG146.23
Type: Master's thesis
Year: 2012
Downloads: 136
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Abstract


TC18 alloy is a precipitation strengthening transitional phase α β titanium alloy , the equivalent of the former Soviet Union BT22 alloy having a nominal composition of Ti-5Al-5Mo-5V-1Cr-1Fe. Because of its higher equivalent weight and containing Cr , Mo and Fe ( each about 1.0wt.%), Ti-1023 alloy has a considerable strengthening effect of heat and high hardenability , suitable for the manufacture of large structural parts air carrier . Metal parts of rapid prototyping technology is developed in the last decade of the new growth timber manufacturing technology, can be part of the three-dimensional digital model-driven , direct manufacturing of near net shape of the structure, but without any mold . Compared with the conventional forging method , a short cycle , low cost , flexibility and good. The mid -1990s , almost simultaneously at home and abroad to carry out related research , there are reports used in the field of aviation . Rapid forming the electron beam as a heat source is an electron beam to achieve accumulation of molten metal material forming technology. Because of the rapid prototyping technology is a combination of material preparation and forming composite manufacturing processes , and materials related to basic research work remains to be further studied . This paper uses an electron beam to obtain a rapid prototyping technology TC18 titanium alloy columnar grain microstructure of heat treatment precipitates and its tensile properties. In the temperature range of 740-830 ℃ solution , then aging treatment at 550 ℃ , with the solution temperature, rapid prototyping TC18 microstructure of primary α phase number and aspect ratio are reduced intensity along the columnar grain direction upward trend, downward trend plasticity ; solution treated at 830 ℃ after aging at 550 ~ 650 ℃ temperature range, as the aging temperature , the intensity along the columnar grain direction downward trend , while the upward trend in plastic ; tensile properties change with the heat treatment process depends mainly on the heat treatment process produces secondary α phase ; cross-sectional analysis found that intergranular ductile dimple and quasi-cleavage fracture morphology of two different types , in the same form of heat treatment corresponding tensile ductility data scattered , and their causes are analyzed.

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CLC: > Industrial Technology > Metallurgy and Metal Craft > Metallurgy and Heat Treatment > Metallic materials > Non - ferrous metals and their alloys > Light non-ferrous metals and their alloys > Titanium
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