This research work deals with the manufacturing of blades for a Francis turbine with a submicrometric structure through the isothermal forging of a heat-treatable aluminum alloy that has been previously processed by angular channel extrusion. In addition, mechanical properties and microstructure of these same blades are analyzed. A comparative study is also carried out between the properties obtained in the forged blades from the alloy previously deformed through angular channel extrusion and those obtained by employing two other isothermal forging processes of this alloy which mean utilizing different process stages. Moreover, a modeling by finite element about the isothermal forging process of the blades is performed using flow rules obtained from compression tests on these alloys at different temperatures. In this way, a much higher degree of accuracy is achieved in the results compared with that obtained through traditional approaches. With this present study, it is intended to make some progress in the development of nanostructured mechanical components with the aim of demonstrating the feasibility of their manufacturing and achieving an improvement in their mechanical properties.

References

References
1.
Valiev
,
R. Z.
, and
Langdon
,
T. G.
,
2006
, “
Principles of Equal-Channel Angular Pressing as a Processing Tool for Grain Refinement
,”
Prog. Mater. Sci.
,
51
(
7
), pp.
881
981
.10.1016/j.pmatsci.2006.02.003
2.
Siopis
,
M. S.
,
Kinsey
,
B. L.
,
Kota
,
N.
, and
Ozdoganlar
,
O. B.
,
2011
, “
Effect of Severe Prior Deformation on Electrical-Assisted Compression of Copper Specimens
,”
ASME J. Manuf. Sci. Eng.
,
133
(
6
), p.
064502
.10.1115/1.4005351
3.
Aour
,
B.
,
Zaïri
,
F.
,
Naït-Abdelaziz
,
M.
,
Gloaguen
,
J. M.
, and
Lefebvre
,
J. M.
,
2009
, “
Finite Element Analysis of Plastic Strain Distribution in Multipass ECAE Process of High Density Polyethylene
,”
ASME J. Manuf. Sci. Eng.
,
131
(
3
), p.
031016
.10.1115/1.3139217
4.
Chaudhury
,
P. K.
,
Cherukuri
,
B.
, and
Srinivasan
,
R.
,
2005
, “
Scaling Up of Equal-Channel Angular Pressing and Its Effect on Mechanical Properties, Microstructure, and Hot Workability of AA 6061
,”
Mater. Sci. Eng., A
,
410–411
, pp.
316
318
.10.1016/j.msea.2005.08.023
5.
Lee
,
J. H.
,
Kang
,
S. H.
, and
Yang
,
D. Y.
,
2008
, “
Novel Forging Technology of a Magnesium Alloy Impeller With Twisted Blades of Micro-Thickness
,”
CIRP Ann.
,
57
(
1
), pp.
261
264
.10.1016/j.cirp.2008.03.064
6.
Kim
,
W. J.
,
Sa
,
Y. K.
,
Kim
,
H. K.
, and
Yoon
,
U. S.
,
2008
, “
Plastic Forming of the Equal-Channel Angular Pressing Processed 6061 Aluminum Alloy
,”
Mater. Sci. Eng., A
,
487
(
1–2
), pp.
360
368
.10.1016/j.msea.2007.10.069
7.
Yanagida
,
A.
,
Joko
,
K.
, and
Azushima
,
A.
,
2008
, “
Formability of Steels Subjected to Cold ECAE Process
,”
J. Mater. Process. Technol.
,
201
(
1–3
), pp.
390
394
.10.1016/j.jmatprotec.2007.11.199
8.
Jin
,
Y. G.
,
Baek
,
H. M.
,
Im
,
Y. T.
, and
Jeon
,
B. C.
,
2011
, “
Continuous ECAP Process Design for Manufacturing a Microstructure-Refined Bolt
,”
Mater. Sci. Eng., A
,
530
, pp.
462
468
.10.1016/j.msea.2011.09.113
9.
Jin
,
Y. G.
,
Baek
,
H. M.
,
Hwang
,
S. K.
,
Im
,
Y. T.
, and
Jeon
,
B. C.
,
2012
, “
Continuous High Strength Aluminum Bolt Manufacturing by the Spring-Loaded ECAP System
,”
J. Mater. Process. Technol.
,
212
(
4
), pp.
848
855
.10.1016/j.jmatprotec.2011.11.010
10.
Kim
,
J. H.
,
Hwang
,
S. K.
,
Im
,
Y. T.
,
Son
,
I. H.
, and
Bae
,
C. M.
,
2012
, “
High-Strength Bolt-Forming of Fine-Grained Aluminum Alloy 6061 With a Continuous Hybrid Process
,”
Mater. Sci. Eng., A
,
552
, pp.
316
322
.10.1016/j.msea.2012.05.046
11.
Choi
,
J. S.
,
Nawaz
,
S.
,
Hwang
,
S. K.
,
Lee
,
H. C.
, and
Im
,
Y. T.
,
2010
, “
Forgeability of Ultra-Fine Grained Aluminum Alloy for Bolt Forming
,”
Int. J. Mech. Sci.
,
52
(
10
), pp.
1269
1276
.10.1016/j.ijmecsci.2010.06.002
12.
Puertas
,
I.
,
Luis-Pérez
,
C. J.
,
Salcedo
,
D.
,
León
J.
,
Luri
,
R.
, and
Fuertes
,
J. P.
,
2012
, “
Isothermal Upset Forging of AA5083 After Severe Plastic Deformation by ECAE
,”
Proceedings of the CIRP 8th CIRP Conference on Intelligent Computation in Manufacturing Engineering
(in press).
13.
Agena
,
A. S. M.
,
2009
, “
A Study of Flow Characteristics of Nanostructured Al-6082 Alloy Produced by ECAP Under Upsetting Test
,”
J. Mater. Process. Technol.
,
209
(
2
), pp.
856
863
.10.1016/j.jmatprotec.2008.02.081
14.
Morehead
,
M.
,
Huang
,
Y.
, and
Hartwig
,
K. T.
,
2007
, “
Machinability of Ultrafine-Grained Copper Using Tungsten Carbide and Polycrystalline Diamond Tools
,”
Int. J. Mach. Tools Manuf.
,
47
(
2
), pp.
286
293
.10.1016/j.ijmachtools.2006.03.014
15.
Shi
,
B. Q.
,
Chen
,
R. S.
, and
Ke
,
W.
,
2011
, “
Effects of Processing Route on Texture and Mechanical Properties of WZ62 Alloy
,”
Trans. Nonferrous Met. Soc. China
,
21
(
4
), pp.
830
835
.10.1016/S1003-6326(11)60789-9
16.
Shi
,
B. Q.
,
Chen
,
R. S.
, and
Ke
,
W.
,
2012
, “
Effects of Forging Processing on the Texture and Tensile Properties of ECAEed AZ80 Magnesium Alloy
,”
Mater. Sci. Eng., A
,
546
, pp.
323
327
.10.1016/j.msea.2012.03.036
17.
Luis Pérez
,
C. J.
,
Puertas
,
I.
,
Salcedo
,
D.
,
León
,
J.
, and
Pérez
,
I.
,
2012
, “
Comparison Between FEM and Experimental Results in the Upsetting of Nano-Structured Materials
,”
Mater. Sci. Forum
,
713
, pp.
31
36
.10.4028/www.scientific.net/MSF.713.31
18.
Bruschi
,
S.
, and
Ghiotti
,
A.
,
2008
, “
Distortions Induced in Turbine Blades by Hot Forging and Cooling
,”
Int. J. Mach. Tools Manuf.
,
48
(
7–8
), pp.
761
767
.10.1016/j.ijmachtools.2007.12.014
19.
Bariani
,
P. F.
,
Bruschi
,
S.
, and
Dal Negro
,
T.
,
2004
, “
Integrating Physical and Numerical Simulation Techniques to Design the Hot Forging Process of Stainless Steel Turbine Blades
,”
Int. J. Mach. Tools Manuf.
,
44
(
9
), pp.
945
951
.10.1016/j.ijmachtools.2004.01.020
20.
Luri
,
R.
,
Luis
,
C. J.
,
León
,
J.
, and
Sebastian
,
M. A.
,
2006
, “
A New Configuration for Equal Channel Angular Extrusion Dies
,”
ASME J. Manuf. Sci. Eng.
,
128
(
4
), pp.
860
865
.10.1115/1.2194555
You do not currently have access to this content.