Effect of MnS inclusion size on machinabilty of low-carbon, leaded, resulfurized free-machining steel
Tóm tắt
The effect of maganese sulfide inclusion size on the machinability of low-carbon, leaded, resulfurized, free-machining steel was investigated by plunge machining using high-speed steel cut-off tools. The cutting and thrust forces were measured as a function of cutting speed. It was observed that the force-cutting speed curves are shifted toward higher cutting speed and tool life to catastrophic failure increases with increasing sulfide size. Observation of Build-up edge (BUE) indicates that a minimum in the cuttingforce curve is generally associated with B UE and that the cutting speeds where BUE is observed are also shifted toward higher speed with increasing inclusion size. It was also found that increasing sulfide size reduces BUE size. Based on these observations, the mechanisms by which manganese sulfide inclusions influence BUE formation are discussed. The possibility of manganese sulfide inclusions indirectly influencing the BUE formation condition through their influence on temperature distribution is suggested.
Tài liệu tham khảo
M.E. Merchant and N. Zlatin: “Basic Reasons for Good Machinability of ‘Free Machining’ Steels,”Trans. ASM, 1949, Vol. 41, p. 647.
V.A. Tipnis: “Influence of Metallurgy on Machinability — Free Machining Steels,”On the Art of Cutting Metals — 75 Years Later, ASME, New York, 1982, p. 119.
E.M. Trent: “Cutting Steel and Iron with Cemented Carbide Tools, Part III, The Influence of Metallurgical Factors in the Flow Zone,”JISI, 1963, Vol. 201, p. 1001.
H. Optiz and W. Konig: “On the Wear of Cutting Tools,” Proc. 8th Int. MTDR Conf., Manchester, 1967, p. 173.
J.E. Williams, E.F. Smart, and D.R. Milner: “The Metallurgy of Machining, Part 2: The Cutting of Single-Phase, Two-Phase, and Some Free Machining Alloys,”Metallurgia, 1970, Vol. 81, p. 51.
D.J. Naylor, D.T. Llewellyn, and D. M. Keane: “Control of Machiniability in Medium-Carbon Steels,”Metals Tech., 1976, Vol. 3, p. 254.
W.J. Wilber, A. W. J. Chisholm, and E. J. Pattinson: “Use of the Scanning Electron Microscope to Study the Function of Manganese Sulfide Inclusions of Resulfurized Free-Machining Steels,” 12th Int. MTDR Conf., 1971, p. 449.
M.C. Shaw, E. Usui, and P. A. Smith: “Free Machining Steel, III: Cutting Forces, Surface Finish, and Chip Formation,”Trans. ASME, 1961, Vol. B83, p. 181.
E. Usui and M.C. Shaw: “Free Machining Steel, IV: Tools with Reduced Contact Length,”Trans. ASME, 1962, Vol. B84, p. 89.
K. Iwata and K. Ueda: “Dynamic Behavior of Manganese Sulfide Inclusions in Machining Under Scanning Electron Microscope Observation,” Proc. Int. Conf. Production Engineering, Toyko, 1974, Part 1, p. 516.
D.R. Poirier and A.P. Kieras: “The Anistropic Behavior of Free-Machining Steels,”Trans. ASME, 1975, Vol. B97, p. 1094.
L. H. S. Luong: “Influence of Microcracks on Machinability of Metals,”Metals Tech. 1980, Vol. 7, p. 465.
V.A. Tipnis and N.H. Cook: “Influence of MnS-Bearing Inclusions on Flow and Fracture in a Machining Shear Zone,”Mechanical Working and Steel Processing IV, AIME, 1965, p. 285.
T.J. Walker and M. C. Shaw: “On Deformation at Large Strains,” Proc. 10th Int. MTDR, Conf. Oxford, 1969, p. 241.
L. H. S. Luong and R.H Brown: “The Role of Microcracks in Large Plastic Deformation,”Trans. ASME, 1971, Vol. B103, p. 431.
C. W. Kovach and A. Moskowitz: “Effects of Manganese and Sulfur on the Machinability of Martensitic Stainless Steels,”Trans. TMS-AIME, 1969, Vol. 245, p. 2157.
M. G. Stevenson and K. R. Duncan: “Effect of Manganese Sulfide Inclusions on the Tool/Chip Interface Shear Stress in Machining of Low Carbon Steel,”JISI, 1973, Vol. 211, p. 710.
L. H. Van Vlack: “Correlation of Machinability with Inclusion Characteristics in Resulfurized Bessemer Steels,”Trans. ASM, 1953, Vol. 45, p. 742.
F. B. Pickering and T. Gladman: “A Modern Approach to Ferrous Metallography, “Steeland Coal, December, 1962, p. 1178.
G. B. Troup: “Metallurgical Influence on Machinability of Free-Machining Steel,”Automatic Machining, January, 1966, p. 66.
G. J. Martson and J. D. Murray: “Machinability of Low-Carbon, Free-Cutting Steel,”JISI, 1970, Vol. 208, p. 568.
J.D. Watson, R.H. Davies, and S. Ramalingam: “Experience with the Use of ASTM E618-81 for Machinability Testing of Free Cutting Steels,” Proc. NAMRC-XI, Madison, 1983, p. 363.
J. E. Williams and E. C. Rollason: “Metallurgical and Practical Machining Parameters Affecting Built-Up Edge Formation in Metal Cutting,”J. Inst. Metals, 1970, Vol. 98, p. 144.
K. Yamaguchi and T. Kato: “Friction Reducing Actions of Inclusions in Metal Cutting,”Trans. ASME, 1980, Vol. B102, p. 221.
S. Ramalingam and B.F. Von Turkovich: “Structure — Property Relations in Free Machining Steels,”Trans. ASME, 1980, Vol. B102, p. 91.
R. Kiesslling: “Non-Metallic Inclusions in Steel — Part III,”ISI Publ. #115, 1968, p. 83.
E. M. Trent:Metal Cutting, 2nd. Ed., Butterworths, London, 1984, p. 196.
K. L. Chandiramani and N. H. Cook: “Investigations on the Nature of Surface of Finish and Its Variation with Cutting Speed,”Trans. ASME, 1964, Vol. B86, p. 134.
C. Spaans: “Some Aspects of the Influence of Sulfur, Lead, and Tellurium on the Cutting Force in Cutting Low Carbon Steels,”Annals CIRP, 1968, Vol. 16, p. 31.
J. D. Watson, S. Ramalingam, and R. H. Brown: “The Metallurgy of Free Machining Steels,”BHP Tech. Bul., 1977, Vol. 21, p. 22.
R. Milovic and J. Wallbank: “The Machining of Low Carbon Free Cutting Steels with High Speed Steel Tools,”J. Applied Metalworking, 1983, Vol. 2, p. 249.
L. M. Riekels and H. Yaguchi: Unpublished Work, Inland Steel, 1983.
R. W. Thompson, R.B. Dixon, and B. S. Levy: “Wear and Failure of High — Speed Steel Cut — Off Tools,”Proc. NAMRC-III, 1975, p. 385.
V. D. Kuznetsov:Metal Transfer and Build-Up in Friciton and Cutting, Pergamon Press, Oxford, 1966, p. 133.
N. N. Zorev:Metal Cutting Mechanics, Pergamon Press, Oxford, 1966, p. 88, 207.
K. Nakayama, M. C. Shaw, and R. C. Brewer: “Relationship Between Cutting Forces, Temperatures, Built-Up Edge, and Surface Finish”Annals CIRP, 1966, Vol. 14, p. 211.
N. Nakamura, et al.: “Effect of Sulphide Morphology on Machinability,”Proc. Japan Soc. Prec. Eng., 1985, p. 585.
S. Katayama, et al.: “Effect of MnS on Machinability,”Tetsu-to-Hagane, 1985, Vol. 71, p. S532.
B. I. Klevebring, and R. Mahrs: “A Note on Microcrack Formation at the Interface Between Inclusion and Steel Matrix During Hot Deformation,”Scan. J. of Metallurgy 1973, Vol. 2, p. 310.
T. B. Cox and J. R. Low: “An Investigation of the Plastic Fracture of AISA 4340 and 18 Nickel-200 Grade Maraging Steels,”Met. Trans., 1974, Vol. 5, p. 1457.
A. S. Argon and J. Im: “Separation of Second Phase Particles in Spheroidized 1045 Steel, Cu-0.6 Pct Cr Alloys, and Maraging Steel in Plastic Straining,”Met. Trans. A., 1975, Vol. 6A, p. 839.
A. N. Gent and B. Park: “Failure Processes in Elastomers at or Near a Rigid Spherial Inclusion,”J. Mat. Science, 1984, Vol. 19, p. 1947.
A. J. Pekelharing: “Built-up Edge (BUE): Is the Mechanism Understood?”Annals CIRP, 1974, Vol. 23, p. 207.
R. L. Aghan and G. R. Wilms: “Scale Formation on Workpiece Surface from Built-Up Edge,”Metals Tech, 1981, Vol. 8, p. 488.
S. Ramalingam, K. Basu, and S. Malkin: “Deformation Index of MnS Inclusions in Resulphurized and Leaded Steels,”Mat. Science and Eng., 1977, Vol. 29, p. 117.
K. G. Lewis: “Property of Free — Machining — Effects of Sulphur and Lead,”Iron and Steel, April 1958, p. 133.
E. C. Rollason: “Metallurgical Research on Machining at the University of Birmingham,”Machinability, ISI Publ. #94, 1967, p. 43.
H. Takeshita:Supplementary Volume to Proc. Int. Sym. Infuence of Metallurgy on Machinability of Steel, ISIJ/ ASM, Tokyo, 1977, p. 15.
T. Ohno: “Production and Properties of Calcium Treated Steels,”Development of Production Process and Quality Improvement of Free — Machining Steel, ISIJ, Toyko, 1984, p. 163.
S. Yamamoto, et al.: “Influence of Various Heat Treated Structures on the Machining Behavior of Medium Carbon Low Alloy Steel,”Tetsu-to-Hagane, 1979, Vol. 65, p. 408.
T. Itoh, S. Abeyama, and S. Nakamura, “The Effect of Built-Up Edge on Surface Finish and Tool Wear Rate,” Proc. Japan Society for Precision Eng., 1976, p. 230.
M. G. Stevenson, W. F. Hastings, and P. L. B. Oxley, “The Prediction of Machining Characterisics of Steels from their Fundamental Properties,”Annals CIRP, 1973, Vol. 22, p. 37.
P. L. B. Oxley, “Machinability: A Mechanics of Machining Approach,”On the Art of Cutting Metals — 75 Years Later, ASME, New York, 1982, p. 37.
K. Iwata, J. Aihara, and K. Okushima, “On the Mechanism of Built-Up Edge Formation in Cutting,”Annals CIRP, 1971, Vol. 19, p. 323.