The methods of spectral, x-ray phase and microprobe analysis show that genuine Damascus steel is a high-purity unalloyed high-carbon steel with a high phosphorus content. It is shown that phosphorus in an amount of from 0.1% to 0.2%, having a high liquation coefficient, contributes to the process of segregation of carbon in interdendritic zone in the process of crystallization. Interdendritic zone formed carbon clusters, in the process of forging transform into oblong carbides cementite. The main physical and chemical factors affecting the formation of oblong carbides are revealed. The hardness of carbide layers was determined, which was about 920 HV. The hardness of the troostite matrix was amounted about 475 HV. It is established that the cutting edge of the blade knife of Damascus steel is nothing more than a “micro-saw” consisting of parallel carbide and troostite layers. Tests are conducted on the preservation of the cutting edge sharpness of the blades knife of homogeneous structure of steel У15А (Russian) and the layered structure of genuine Damascus steel Ds15P (Indo-Persian). Found that with little effort cut (to 4 kg) ancient Damascus steel (Ds15P) shows a greater number of cuts than the modern instrument steel У15А. With an increase, force on the cutting edge from 6 kg to 12 kg carbon Tool steel is showed a more number of cutting on the 25% than in genuine Damascus steel. The fatigue crack propagation in the true Layered structure of Damascus steel Ds15P occurs for a greater number of cycles than in a homogeneous structure of the steel У15А. The blade knife of genuine Damascus steel, in terms of fatigue reliability (survivability), has almost 2 times longer service life than the blade knife of the modern carbon tool steel type У15А. It is proved that loss in cutting ability of a genuine Damascus steel compensates increased the reliability (“survivability”) of the blade knife with fatigue loads.
References
[1]
Gaev, I.S. (1965) Damascus Steel and Modern Iron-Carbon Alloys. Metal Science and Heat Treatment, 9, 17-24. (In Russian)
[2]
Verhoeven, J.D. and Jones, L.L. (1987) Damascus Steel, Part II: Origin of the Damask Pattern. Metallographe, 20, 153-180. https://doi.org/10.1016/0026-0800(87)90027-9
[3]
Verhoeven, J.D. (2007) Pattern Formation in Wootz Damascus Steel Swords and Blades. Indian Journal of History of Science, 42.2, 559-574.
[4]
Barnett, M.R., Sullivan, A. and Balasubramaniam, R. (2009) Electron Backscattering Diffraction Analysis of an Ancient Wootz Steel Blade from Central India. Materials Characterization, 60, 252-260. https://doi.org/10.1016/j.matchar.2008.10.004
[5]
Taganov, I.N. and Kalinin, B.D. (2009) Influence of Phosphorus Impurity on the Technology of Damascus Steel. Metalworking, 2, 40-46. (In Russian)
[6]
Kalinin, B.D. and Taganov, I.N. (2009) The X-RAY Fluorescent Analysis Use for Examination and Attribution of the Indo-Persian 17th Century Genuine Damascus steel Arms. Analytics and Control, 13, 135-140. (In Russian)
[7]
Sukhanov, D.A. (2018) Influence of Phosphorus Impurity on the Structure and Nature of the Destruction of the genuine Damascus Steel. International Journal of Engineering Technologies and Management Research, 5, 26-37.
[8]
Sunada, H., Wadsworth, J., Lin, J. and Sherby, O.D. (1979) Mechanical Properties and Microstructure of Heat-Treated Ultrahigh Carbone Steels. Materials Science and Engineering, 38, 35-40. https://doi.org/10.1016/0025-5416(79)90029-6
[9]
Oyama, T., Sherby, O.D., Wadsworth, J. and Walser, B. (1984) Application of the Divorced Eutectoid Transformation to the Development of Fine-Grained, Spheroidized Structures in Ultrahigh Carbone Steels. Metallurgical, 18, 799-804.
Sukhanov, D.A., Arkhangelsky, L.B., Plotnikova, N.V. and Belousova, N.S. (2016) Morphology of Excess Carbides Damascus Steel. Journal of Materials Science Research, 5, 59-65. https://doi.org/10.5539/jmsr.v5n3p59
[12]
Sukhanov, D.A. and Plotnikova, N.V. (2016) Wootz: Cast Iron or Steel? Materials Sciences and Applications, 7, 792-802. https://doi.org/10.4236/msa.2016.711061
[13]
Sukhanov, D.A., Arkhangelskiy, L.B. and Plotnikova, N.V. (2017) Nature of Angular Carbides in Damascus Steel. Metallurgist, 61, 40-46. https://doi.org/10.1007/s11015-017-0451-7
[14]
Sukhanov, D.A. and Plotnikova, N.V. (2018) Formation of Faceted Excess Carbides in Damascus Steels Ledeburite Class. Journal of Materials Science and Engineering B, 8, 36-44.
[15]
Sukhanov, D.A., Arkhangelskiy, L.B. and Plotnikova, N.V. (2018) Mechanism of Fe2C Type Eutectic Carbide Formation within Damascus Steel Structure. Metallurgist, 62, 261-269. https://doi.org/10.1007/s11015-018-0654-6
[16]
Anosov, P.P. (1841) On the Bulats (Damascus Steels). Mining Journal, 2, 157-317. (In Russian)
[17]
Tschernoff, D.K. (1899) Damask Steel. The Metallographist (Boston), No. 3. (In USA).
[18]
Belaiew, N.T. (1918) Damascene Steel. Journal of the Iron and Steel Institute, 97, 417-437.
[19]
Tavadze, F.N., Amaglobeli, V.G., Inanishvili, G.V. and Eterashvili, T.V. (1984) Electron Microscopic Studies of Damascus Steels. Bulletin of the Academy of Sciences of the Georgian SSR, 113, 601-604. (In USSR)
[20]
Sherby, O.D. and Wadsworth, J. (1985) Damascus Steel. Scientific American, 252, 112-120. https://doi.org/10.1038/scientificamerican0285-112
[21]
Verhoeven, J.D., Pendray, A.N. and Dauksch, W.E. (1998) The Key Role of Impurities in Ancient Damascus Steel Blades. Journal of Metallurgy, 50, 58-64. https://doi.org/10.1007/s11837-998-0419-y
Al-Biruni (1038) Meeting Details for the Knowledge of Jewelry. (Translated by Professor, A.M., Belenitsky, 1963). Publishing House of the Academy of Sciences of the USSR, Leningrad, 230-241.
[24]
Zschokke, В. (1924) Du Damasse et des Lames de Damas. Revue de Métallurgie, 21, 635-669. https://doi.org/10.1051/metal/192421110635
[25]
Sukhanov, D.A. (2012) The Structural Strength of Multilayered Steels (Welded Damascus Steels). Collection of Reports “State, Problems and Prospects of Restoration of Technology of Production of Damascus Steel, Bulat and Metal Composites”, Vol. 1, 83-104. (In Russian)
