Abstract
This article studies the surface characteristics of quench- and temper-treated AISI 440A martensitic stainless steels, which were rough cut using wire electrical discharge machining (WEDM). The microstructure of the recast layer on the cut surface was investigated using scanning and transmission electron microscopes, and the phase compositions were analyzed with an energy-dispersive X-ray (EDX) spectrometer. Experimental results showed that the thickness of the recast layer varied with the heat-treatment condition of the workpiece, the largest thickness was obtained with a quenched specimen, and the thickness decreased with increasing tempering temperature. Intergranular surface cracks were observed only from the as-quenched specimen, whereas surface cracks were not found in the rough-cut specimens after tempering above 200 °C. It is reckoned that reliefing of the thermal residual stress in the quenched workpiece induced the surface intergranular cracks. Microstructures of the recast layer on the rough-cut surfaces of the 600 °C tempered specimen were examined using cross-sectional transmission electron microscopy (TEM) specimens. An amorphous layer exists at some parts of the outermost cut surface. A high density of wire electrode droplets of spherical shape, approximately 10 to 60 nm in size, was found throughout the porous recast layer. Besides, many high-chromium containing sigma spheres with sizes of approximately 120 to 200 nm were precipitated at the bottom part of the recast layer, and its formation mechanism was proposed. Adjacent to the recast layer was a heat-affected zone (HAZ) with a thickness of about 4 µm, in which temper-induced carbides were fully dissolved. The HAZ comprised basically two distinct regions: the first region adjacent to the recast layer was composed of a lath martensite structure, while the other region was an annealed ferrite structure.
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References
ASM Handbook, 10th ed., vol. 1, Properties and Selection: Irons, Steels, and High-Performance Alloys, ASM, Materials Park, OH 1990, pp. 758–79.
P. Schwaab et al.: Atlas of Precipitates in Steels, Verlag Stahleisen mbH, Duesseldorf, 1983, pp. 160–83.
W. Koenig: Fertigungsverfahren Band 3: Abtragen, VDI Verlag GmbH, Duesseldorf, 1990.
P. Beardmore and D. Hull: J. Inst. Met., 1996, vol. 94, p. 14.
Y. Fukuzawa, Y. Kojima, T. Tani, E. Sekiguti, and N. Mohri: Mater. Manufacturing Processes, 1995, vol. 10, p. 195.
M.M. Barash and C.S. Kahlon: Int. J. Mach. Tool Des. Res., 1964, vol. 4, p. 1.
B. Hribernik and F. Russ: Arch. Eisenhuettenwes., 1982, vol. 53, p. 373.
J.R. Crookall and B.C. Khor: Proceedings 15th International Machine Tool Design Research Conference, 1975, p. 373.
Y.S. Wong, L.C. Lim, and L.C. Lee: J. Mater. Processing Technol., 1995, vol. 48, p. 299.
C.A. Huang, H.-J. Klaar, and I.L. Kao: DGM Metallographie-Tagung, Rostock, Germany, 1999.
H.-J. Klaar and C.A. Huang: Prakt. Met. Sonderbd. 1993, vol. 24, p. 333.
B.N. Zolotych: Ueber die Physikalischen Grundlagen der Elektroerosiven Metallbearbeitung. Bd. 1: Elekrtroerosive Bearbeitung von Metallen, Akademie der Wissenschaften der UdSSR, Moskau, 1957.
L.C. Lee, L.C. Lim, Y.S. Wang, and H.H. Lu: J. Mater. Processing Technol., 1990, vol. 24, p. 513.
P. Duwez and S.C.H. Lin: J. Appl. Phys., 1967, vol. 38, p. 4096.
H.H. Kuo: Master’s Thesis, 2000, Chang-Gung University, Taiwan, R.O.C.
E.L. Brown: Metall. Trans. A, 1983, vol. 14A, pp. 791–800.
ASM Handbook, 10th ed., vol. 3, Alloy Phase Diagrams, ASM, Materials Park, OH, 1992, p. 152.
A. Rose and Strassburg: Arch. Eisenhuetnwes., 1956, vol. 27, p. 513.
W.I. Jutzler: Ph.D. Dissertation, RWTH-Aachen University, Aachen, 1982.
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Huang, C.A., Tu, G.C., Yao, H.T. et al. Characteristics of the rough-cut surface of quenched and tempered martensitic stainless steel using wire electrical discharge machining. Metall Mater Trans A 35, 1351–1357 (2004). https://doi.org/10.1007/s11661-004-0310-6
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DOI: https://doi.org/10.1007/s11661-004-0310-6