Abstract
In this article, porosity, as defined by the distribution and amount of pores in spray-deposited A-2 tool steel, was investigated. Ceramic and copper substrates were used in order to understand the influence of substrate material on the formation of porosity. Moreover, the relationship between porosity and spray distance was studied using three different spray distances together with a ceramic substrate. Distinct porosity zones were identified in the deposited material. Interstitial and gas-related porosity were both present in the deposits. Experimental results show that the optimum parameters correspond to a 178-mm deposition distance, in the case of a ceramic substrate. The experimental results suggested that the pore formation mechanism in spray-deposited materials is closely dependent on the thickness of the mushy layer in the upper surface of the deposit during the spray-forming process. The thickness of the mushy zone is determined by the solid fraction contained in the impinging droplets and the thermal-transfer conditions. Moreover, the deposition angle appears to closely influence the pore morphology, as well as the thickness of the surface porosity band of the deposits. Finally, the present results suggest that residual internal stress may be an important factor in influencing crack formation in the spray-deposited tool steel.
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References
E.J. Lavernia and Y. Wu: Spray Atomization and Deposition, John Wiley & Sons, New York, NY, 1996.
P. Mathur, D. Apelian, and A. Lawley: Acta Metall., 1989, vol. 37, pp. 429–43.
E.J. Lavernia: Int. J. Rapid Solidification, 1989, vol. 5, pp. 47–85.
P.S. Grant, W.T. Kim, and B. Cantor: Mater. Sci. Eng., 1991, vol. A134, pp. 1111–14.
S. Annavarapu and R. Doherty: Int. J. Powder Metall., 1993, vol. 29, pp. 331–43.
R.H. Bricknell: Metall. Trans. A, 1986, vol. 17A, pp. 583–91.
H.C. Fiedler, T.F. Sawyer, R.W. Kopp, and A.G. Leatham: J. Met., 1987, vol. 39 (8), pp. 28–33.
H.C. Fiedler, T.F. Sawyer, and R.W. Kopp: “Spray Forming—An Evaluation Using IN718,” General Electric Report No. 86 CRD 113, General Electric, Schenectady, New York, NY, 1986.
M.G. Benz, T.F. Sawyer, W.T. Carter, R.J. Zabala and P.L. Dupree: Powder Metall., 1994, vol. 37, pp. 213–18.
H. Liu, E.J. Lavernia, and R.H. Rangel: Acta Metall. Mater., 1994, vol. 42, pp. 3277–89.
H. Liu, E.J. Lavernia, and R.H. Rangel: J. Thermal Spray Technol., 1994, vol. 2, pp. 369–78.
B.P. Bewlay and B. Cantor: J. Mater. Res., 1991, vol. 6, pp. 1433–54.
B.P. Bewlay and B. Cantor: in Rapidly Solidified Materials, P. Lee and R. Carbonara, eds., ASM INTERNATIONAL, Materials Park, OH, 1986, pp. 15–21.
S. Annavarapu, D. Apelian, and A. Lawley: Metall. Trans. A, 1988, vol. 19A, pp. 3077–86.
E.J. Lavernia, J. Baram, and E. Gutierrez: Mater. Sci. Eng., 1991, vol. A132, pp. 119–33.
P.S. Grant and B. Cantor: Proc. Int. Conf. on Advanced Synthesis of Engineered Structural Materials, J.J. Moore, E.J. Lavernia, and F.H. Froes, eds., ASM INTERNATIONAL, Materials Park, OH, 1993, pp. 263–67.
P.S. Grant and B. Cantor: Cast Met., 1991, vol. 4, pp. 140–51.
M.G. Chu, D.K. Denzer, A.K. Chakrabarti, and F.R. Billman: Mater. Sci. Eng., 1988, vol. A98, pp. 227–32.
D.N. Hanlon, W.M. Rainforth, and C.M. Sellars: J. Mater. Sci., 1998, vol. 33, pp. 3233–44.
A.G. Leatham and R.G. Brooks: Modern Development Powder Metall., 1984, vol. 15, pp. 157–73.
Eon-Sik Lee, Woo-Jin Park, J.Y. Jung, and S. Ahn: Metall. Mater. Trans. A, 1998, vol. 29A, pp. 1395–1404.
B.P. Bewlay and B. Cantor: Metall. Trans. B, 1990, vol. 21B, pp. 899–912.
J.R. Davis: Tool Materials, ASM INTERNATIONAL, Materials Park, OH, 1995, p. 135.
F.H. Samuel: Metall. Trans. A, 1986, vol. 17A, pp. 73–91.
E.J. Lavernia, J.D. Ayers, and T.S. Srivatsan: Int. Mater. Rev., 1992, vol. 37, pp. 1–44.
W.D. Cai, D. Bailey, A. Sickinger, and E.J. Lavernia: J. Thermal Spray Technol., 1994, vol. 3, pp. 135–41.
V.G. McDonell, E.J. Lavernia, and G.S. Samuelsen: in Synthesis and Analysis in Materials Processing: Advances in Characterization and Diagnosis of Ceramic and Metal Particulate Processing, E.J. Lavernia, H. Henein, and I. Anderson, eds., TMS, Warrendale, PA, 1989, pp. 13–37.
X. Liang, J.C. Earthman, and E.J. Lavernia: Acta Metall. Mater., 1992, vol. 40, pp. 3003–16.
H. Liu, E.J. Lavernia, and R.H. Rangel: Acta Metall. Mater., 1995, vol. 43, pp. 2053–72.
Smithells Metals Reference Book, E.A. Brandes and G.B. Brook, eds., Butterworth-Heinemann Ltd., London, 1992, pp. 12-13–12-14.
M.G. Chu: in Spray Forming, The Encyclopedia of Advanced Materials, D. Bloor, R.J. Brook, M.C. Flemings, and S. Mahajan, eds., Pergamon Press, Elmsford, NY, 1994, pp. 2624–28.
M.G. Chu and S. John Pien: Spray Forming Using a Linear Nozzle: Microstructure Analysis and Deposit Thermal Modeling, Proc. Julian Szekely Memorial Symp. on Materials Processing, H.Y. Sohn, ed., TMS, Warrendale, PA, 1997, pp. 423–38.
P. Mathur, S. Annavarapu, D. Apelian, and A. Lawley: Mater. Sci. Eng., 1991, vol. A142, pp. 261–76.
Q. Xu, V. Gupta, and E.J. Lavernia: Metall. Mater. Trans. B, 1999, vol. 30B, pp. 527–39.
C.G. Levi: Metall. Trans. A, 1988, vol. 19A, pp. 699–708.
J.L. Estrada and J. Duszczyk: J. Mater. Sci., 1990, vol. 25, pp. 1381–91.
H. Lubanska: J. Met., 1970, vol. 22 (2), pp. 45–49.
W.D. Cai and E.J. Lavernia: Mater. Sci. Eng., 1997, vol. A226, pp. 8–12.
Z.H. Lee, H.M. Hu, D.R. White, and E.J. Lavernia: Metall. Mater. Trans. A, 1999, vol. 30A, pp. 1679–82.
D.M. Knowles and J.E. King: Mater. Sci. Technol., 1991, vol. 7, pp. 1015–20.
S. Ho and E.J. Lavernia: Metall. Mater. Trans. A, 1996, vol. 27A, pp. 3241–49.
S. Ho and E.J. Lavernia: Scripta Mater., 1997, vol. 36, pp. 283–90.
S. Ho and E.J. Lavernia: Scripta Mater., 1996, vol. 34, pp. 1911–18.
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Hu, H., Lavernia, E.J., Lee, Z.H. et al. On the evolution of porosity in spray-deposited tool steels. Metall Mater Trans A 31, 725–735 (2000). https://doi.org/10.1007/s11661-000-0014-5
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DOI: https://doi.org/10.1007/s11661-000-0014-5