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2016 Vol. 59, No. 19
Published: 2016-10-01
FEATURE
FIGURE
FORUM
C0NTENTS
 
       C0NTENTS
6 contents
2016 Vol. 59 (19): 6-10 [Abstract] ( 132 ) HTMLNew PDF (2307 KB)  ( 445 )
       FEATURE
16 Effect of Heat Treatment on Microstructure and Properties of Laser Additive Manufactured Ti2AlNb-Based Alloy
TANG Yangjie, LIU Yantao, ZHANG Yongzhong
DOI: 10.16080/j.issn1671-833x.2016.19.016
Thin-wall samples of Ti-22Al-25Nb alloy are prepared through the laser additive manufacturing process.
The macro morphology, phase composition and microstructure for as-deposited and heat-treated samples are investigated.
In addition, the microstructure and room tensile properties of Ti-22Al-25Nb alloy are analyzed after a series of heat
treatments. The results indicate that for the as-deposited sample, the phase transforms as B2+O+α2→B2+O→B2 along the
build-up direction, while the phase composition and microstructure of heat-treated sample become homogeneous, which
is composed of B2, O and α2 phases. After solution treatment of 930℃ ×2h/air cooling followed by aging treatment of
800℃ × 24h/air cooling, the laser additive manufactured Ti2AlNb alloy shows better tensile properties with ultimate tensile
strength of 1017 MPa and elongation of 6.0%.
2016 Vol. 59 (19): 16-21 [Abstract] ( 349 ) HTMLNew PDF (4252 KB)  ( 583 )
       FIGURE
22 Improving Intelligent Manufacturing Level by Clear Direction of Development
2016 Vol. 59 (19): 22-23 [Abstract] ( 199 ) HTMLNew PDF (1399 KB)  ( 615 )
       FORUM
24 Research Progress on CFRTP Laser Joining Technology
JIAO Junke, WANG Qiang, ZAN Shaoping, ZHANG Wenwu
DOI: 10.16080/j.issn1671-833x.2016.19.024
Carbon fiber reinforced thermal polymers (CFRTP) have broad application prospects in area of aerospace,
new energy vehicles and unmanned aerial vehicles. Realizing a high quality joint between CFRTP parts is a key technology
for CFRTP industrial applications. In this paper, research progress on CFRTP laser welding/joining technology was introduced.
Current research problems and development trend of future research were also analyzed.
2016 Vol. 59 (19): 24-29 [Abstract] ( 238 ) HTMLNew PDF (1894 KB)  ( 1019 )
32 Laser Micro-Holes Machining Technology and Its Application
YANG Lijun, KONG Xianjun, WANG Yang, DING Ye, ZHANG Hongzhi, CHI Guanxin
DOI: 10.16080/j.issn1671-833x.2016.19.032
With rapid development of high quality and sophisticated equipment, the demand of high quality, high
depth/radius radio micro-holes is more and more urgent. Femtosecond laser and water-jet guided laser drilling technologies
are introduced. Firstly, the principles of two kinds of micro-holes machining technologies are discussed and two kinds
of micro-holes drilling technology research status are reviewed; Then, the effects of processing mode, laser process parameters,
processing environment (vacuum, gas, liquid, chemical environment) and laser beam coupling with water on the
micro-hole drilling quality are discussed; Finally, aerospace application of two kinds of micro-hole machining technologies
and current problems which we face are summed up.
2016 Vol. 59 (19): 32-38 [Abstract] ( 316 ) HTMLNew PDF (3082 KB)  ( 1487 )
39 Mircrostructure and Properties of Nano-TiN-Ni45A Composite Coatings Prepared by Laser Cladding
WANG Cunshan,YU Qun
DOI: 10.16080/j.issn1671-833x.2016.19.039
Ni-based composite coatings with different nano-TiN additions are produced by laser cladding on
38CrMoAl substrate. The influence of nano-TiN on the mircrostructure and properties of the coating is investigated
through X-ray diffraction, scanning electron microscopy, electronic probe, Vickers hardness tester, and friction wear testing
machine. Results show that the coatings consist of γ-Ni, Ni3B, M23C6, and TiN phases, exhibiting hypoeutectic morphological
characteristics. As the addition of nano-TiN is 5.0 %, the primary γ-Ni dendrite is coarsed obviously, whose number is
increased. However, as the addition of nano-TiN is more than 5.0 %, the primary γ-Ni dendrite shows decrases in size and
number with increasing the addition of nano-TiN, whose growth morphology changes from equiaxed dendrite to columnar
dendrite. Meanwhile, the number of the micron-sized TiN particle, growing in form of agglomeration, is also increased,
and its distribution becomes more uniform. For this reason, the average hardness of the coatings gradually increases with
increasing the addition of nano-TiN as a whole, and the tribological perperty is best as the addition of nano-TiN is 15%,
showing 8.7% and 32.3% decrease in friction coefficient and wear volume as compared with the coating without TiN addition,
and a 7.0 % increase in average hardness.
2016 Vol. 59 (19): 39-44 [Abstract] ( 251 ) HTMLNew PDF (4122 KB)  ( 415 )
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