The mechanical properties of age-hardenable aluminum alloy extrusions are critically dependent on the rate at which the part is cooled (quenched) after the forming operation. The present study continues the development of an intelligent spray quenching system, which selects the optimal nozzle configuration based on part geometry and composition such that the magnitude and uniformity of hardness (or yield strength) is maximized while residual stresses are minimized. The quenching of a complex-shaped part with multiple, overlapping sprays was successfully modeled using spray heat transfer correlations as boundary conditions within a finite element program. The hardness distribution of the heat-treated part was accurately predicted using the quench factor technique; that is, the metallurgical transformations that occur within the part were linked to the cooling history predicted by the finite element program. This study represents the first successful attempt at systematically predicting the mechanical properties of a quenched metallic part from knowledge of only the spray boundary conditions.

Issue Section:
Heat Transfer in Manufacturing
Keywords:
Boiling, Materials Processing and Manufacturing Processes, Sprays/Droplets
Topics:
Aluminum alloys, Mechanical properties, Quenching (Metalworking), Sprays, Boundary-value problems, Finite element analysis, Boiling, Cooling, Drops, Geometry, Heat, Heat transfer, Manufacturing, Materials processing, Nozzles, Residual stresses, Yield strength
1.
ASM, 1991, ASM Handbook, Vol. 4, 10th ed., ASM International, Materials Park, OH.
2.
ASTM, 1993, Annual Book of ASTM Standards, Vol. 03.01, American Society for Testing and Materials, Philadelphia, PA.
3.
Avrami
M.
,
1940
, “
Kinetics of Phase Change II—Transformation-Time Relations for Random Distribution of Nuclei
,”
Journal of Chemical Physics
, Vol.
8
, pp.
212
–
224
.
4.
Axter, S. E., 1980, “Effects of Interrupted Quenches on the Properties of Aluminum,” Society of Manufacturing Engineers Technical Paper CM80-409.
5.
Bates
C. E.
,
1987
, “
Selecting Quenchants to Maximize Tensile Properties and Minimize Distortion in Aluminum Parts
,”
Journal of Heat Treating
, Vol.
5
, pp.
27
–
40
.
6.
Bates
C. E.
,
1988
, “
Predicting Properties and Minimizing Residual Stress in Quenched Steel Parts
,”
Journal of Heat Treating
, Vol.
6
, pp.
27
–
45
.
7.
Bates
C. E.
and
Totten
G. E.
,
1988
, “
Procedure for Quenching Media Selection to Maximize Tensile Properties and Minimize Distortion in Aluminum Alloy Parts
,”
Heat Treatment of Metals
, Vol.
15
, pp.
89
–
97
.
8.
Bates, C. E., and Totten, G. E., 1992, “Application of Quench Factor Analysis to Predict Hardness Under Laboratory and Production Conditions,” Proceedings of the First International Conference on Quenching and Control of Distortion, Chicago, IL, pp. 33–39.
9.
Cahn
J. W.
,
1956
a, “
The Kinetics of Grain Boundary Nucleated Reactions
,”
Acta Metallurgica
, Vol.
4
, pp.
449
–
459
.
10.
Cahn
J. W.
,
1956
b, “
Transformation Kinetics During Continuous Cooling
,”
Acta Metallurgica
, Vol.
4
, pp.
572
–
575
.
11.
Chevrier, J. C., Simon, A., and Beck, G., 1981, “Optimal Cooling Rate and Process Control in Metallic Parts Heat Treatment,” Heat and Mass Transfer in Metallurgical Systems, D. B. Spalding and N. H. Afgan, eds., Hemisphere Publishing Corp., Washington, DC, pp. 535–544.
12.
Conserva
M.
, and
Fiorini
P.
,
1973
, “
Interpretation of Quench-Sensitivity in Al-Zn-Mg-Cu Alloys
,”
Metallurgical Transactions
, Vol.
4
, pp.
857
–
862
.
13.
Deiters
T. A.
, and
Mudawar
I.
,
1989
, “
Optimization of Spray Quenching for Aluminum Extrusion, Forging, or Continuous Casting
,”
Journal of Heat Treating
, Vol.
7
, pp.
9
–
18
.
14.
Evancho, J. W., 1973, “Effects of Quenching on Strength and Toughness of 6351 Extrusions,” Alcoa Laboratories Report 13-73-HQ40, Alcoa Center, PA.
15.
Evancho
J. W.
, and
Staley
J. T.
,
1974
, “
Kinetics of Precipitation in Aluminum Alloys During Continuous Cooling
,”
Metallurgical Transactions
, Vol.
5
, pp.
43
–
47
.
16.
Fink
W. L.
, and
Willey
L. A.
,
1948
, “
Quenching of 75S Aluminum Alloy
,”
Transactions AIME
, Vol.
175
, pp.
414
–
427
.
17.
Gubareff, G. G., Janssen, J. E., and Torborg, R. H., 1960, Thermal Radiation Properties Survey, 2nd ed., Honeywell Research Center, Minneapolis, MN.
18.
Hall, D. D., 1993, “A Method of Predicting and Optimizing the Thermal History and Resulting Mechanical Properties of Aluminum Alloy Parts Subjected to Spray Quenching,” M.S. Thesis, Purdue University, West Lafayette, IN.
19.
Hibbitt, Karlsson and Sorensen, Inc., 1989, ABAQUS User’s Manual, Ver. 4.8, Providence, RI.
20.
Kim, J. S., 1989, “Prediction of the Influence of Water Spray Quenching on the Age-Hardenability of Aluminum Alloy 2024,” M.S. Thesis, Purdue University, West Lafayette, IN.
21.
Klinzing
W. P.
,
Rozzi
J. C.
, and
Mudawar
I.
,
1992
, “
Film and Transition Boiling Correlations for Quenching of Hot Surfaces With Water Sprays
,”
Journal of Heat Treating
, Vol.
9
, pp.
91
–
103
.
22.
Mudawar
I.
, and
Valentine
W. S.
,
1989
, “
Determination of the Local Quench Curve for Spray-Cooled Metallic Surfaces
,”
Journal of Heat Treating
, Vol.
7
, pp.
107
–
121
.
23.
Rozzi, J. C., 1991, “Quenching of Aluminum Parts Having Irregular Geometries Using Multiple Water Sprays,” M.S. Thesis, Purdue University, West Lafayette, IN.
24.
Rozzi
J. C.
,
Klinzing
W. P.
, and
Mudawar
I.
,
1992
, “
Effects of Spray Configuration on the Uniformity of Cooling Rate and Hardness in the Quenching of Aluminum Parts With Nonuniform Shapes
,”
Journal of Materials Engineering and Performance
, Vol.
1
, pp.
49
–
60
.
25.
Sawtell
R. R.
,
1984
, “
Effects of Quenching Path in Aluminum Alloy 7075
,”
Aluminum
, Vol.
60
, pp.
198
–
202
.
26.
Staley
J. T.
,
1987
, “
Quench Factor Analysis of Aluminum Alloys
,”
Materials Science and Technology
, Vol.
3
, pp.
923
–
935
.
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