Q. Y Pan
,
WD. Huang
,
YM. Li
,
X. Lin
,
YH. Zhou and X.C. Yan( State Key Lab. of Solidification Processing
,
Northwestern Polytechnical University
,
Xi'an 710072
,
China ( Laser Processing Center
,
Tianjin College of Textile Technology
,
Tianjin 300160
,
China )
金属学报(英文版)
A novel wide-band laser cladding system, with high rate of cladding, has been developed in the present work. The system mainly consisted of a 5kW CO2 laser, an automatic Fowder feeder and a wide-band scanning rotative polygon mirmr which can produce a linear or rectangular focused laser beam. Using this system, a Ni-Cr-Si-B alloy powder was cladded on the sudece of tgpe 321 austenitic stainless steel in onder to improve its wear and cormsion resistance. The pitting cormsion, high temperuture oxidation and wear tests were conducted in onder to evaluate the propertles of the laser cladded layer. The results demonstrated that the cladded layer can significantly improtte the adhesive wear and pitting cormsion resistance of the substmte. Moreover,the cladded layer exhibited good oxidafion resistance, which is almost the same as that of GMR-235D N-based superalloy.
关键词:
austenitic stainless steel
,
null
,
null
,
null
LIANG Yong LI Ruiguo Institute of Metal Research
,
Academia Sinica
,
Shenyang 110015
,
ChinaInstitute of Corrosion and Protection of Metals
,
Aademia Sinica
,
Shenyang
,
110015
,
China
材料科学技术（英文）
Recent advances in laser coating technology including laser cladding,laser surface alloying and laser vapour deposition in China are reviewed in this paper.
关键词:
laser
,
null
,
null
,
null
,
null
L.Q. Li
,
Y.B. Chen
,
X.Y. Wang
,
S.Y. Lin
金属学报(英文版)
Laser forming involves heating sheet metal workpiece along a certain path with a
defocused laser beam directed irradiate to the surface. During laser forming, a transient temperature fields is caused by the irradiation and travelling of a laser beam.
Consequently, thermal expansion and contraction take place, and allows the thermal-
mechanical forming of complex shapes. This is a new manufacturing technique that
forming metal sheet only by thermal stress. Therefore, the analysis of temperature
fields and stress fields are very useful for studying the forming mechanism and controlling the accuracy of laser forming. The non-liner finite element solver, MARC, is
employed to solve the thermal-mechanical analysis. Using this model, the stress and
strain distribution of pure aluminum plate with di®erent thickness are analyzed. The
influence of scanning speed on temperature fields and plastic strain of metal sheet under the condition of constant line energy are also presented. Numerical results agree
well with the experimental results.
关键词:
laser forming
,
null
,
null
Huaming WANG
,
Xijun SUN
,
Xiaoxuan LI
材料科学技术（英文）
An austenitic stainless steel 1Cr18Ni9Ti and a solid solution-strengthened Ni-base superalloy GH30 were shock processed using a Q-switched pulsed Nd-glass laser. Microstructure, hardness and residual stress of the laser shock processed surface were investigated as functions of laser processing parameters. Results show that high density of dislocations and fine deformation twins are produced in the laser shock processed surface layers in both the austenitic stainless steel and the nickel-base superalloy. Extensive strain-induced martensite was also observed in the laser shock processed zone of the austenitic steel. The hardness of the laser shock processed surface was significantly enhanced and compressive stress as high as 400 MPa was produced in the laser shock processed surface.
关键词:
Laser shock processing
,
null
,
null
,
null
G.F. Yuan
,
C.S. Ge
,
X.Y. Zeng
金属学报(英文版)
The physical model of temperature field and thermal stress field are established in this
paper, on which the numerical simulation with the assuming physical and laser milling
parameters have been finished. The laser milling process can be explained.
关键词:
laser milling
,
null
,
null
Q.L.Deng1)
,
W.D.Huang1)
,
Y.H.Zhou1)
,
C.Y.Yu2)
,
Y.K.Zhang2)
,
Y.X.Tang2) and H.Zhang2) 1) State Key Lab .of Solidification Processing
,
Northwestern Polytechnical University
,
Xi’an 710072
,
China 2) Mechanical Department
,
Nanjing University of Aeronautics & Astronautics
,
Nanjing 210016
,
China
金属学报(英文版)
The mechanism oflasershock processing wasanalyzedinthispaper. Westudyexperimentallythelasershock processingon 2024 T62 aviation aluminium alloys. Theexperimental results show thefatiguelife of 2024 T62 aviation aluminium alloysshocked by a laserisimprovedgreatly.
关键词:
lasershock processing
,
null
,
null
Journal of Materials Research
The metal/ceramic interface in an in situ synthesized Ti/TiCP composite coating by laser processing was analyzed using high-resolution transmission electron microscopy. The TiC particles were distributed uniformly in the matrix and were highly faceted. The interfaces between the TiC particles and the beta matrix were abrupt and free of any other reaction phases. It was the Ti-terminated TiC surface that bonded to the beta matrix, resulting in the metallic bonding between the TiC particles and the matrix.
关键词:
resolution electron-microscopy;ti-6al-4v;tic(100);tic(111)
