A brief review is given of the evolution of welded Damascus steel and genuine Damascus steel along with the mystery of how the pattern of genuine Damascus steel is produced. The prior studies claiming to have either, reproduced the genuine Damascus steel, or explained the mechanism of pattern formation, are reviewed. None of these studies have allowed modern bladesmiths to reproduce the steel. The author and a bladesmith, Alfred Pendray, have developed a process with which Pendray can produce blades that match the microstructures of the best museum quality genuine Damascus blades. Experimental research is reviewed showing that the microstructure of this steel is produced by an unusual type of banding that requires: (1) the presence of low levels of certain impurity elements in the hypereutectoid steels, with V being most effective, and (2) a thermal cycling heat treatment. A main difference of this type of banding and the ubiquitous banding of hypoeutectoid steels is point (2), the requirement of thermal cycling. A theory for the banding mechanism is presented.

Evidence of Lath Martensite in High-C Japanese Sword Produced from Tamahagane Steel by Tatara Process | Scientific.Net My Cart Registration Log In For Libraries For Publication Open Access Downloads About Us Contact Us Search Paper Titles In Situ TEM and APT Analysis on the Dislocations Associated with Solute Carbons in Strain-Aged Low Carbon Pipeline Steels p.122 In Situ Observation of Microstructure Evolution in Low Carbon Bainite Steels Isothermally Held Below A 1 Temperature p.126 Isothermal Martensitic Transformation in a Sensitized SUS304 Stainless Steel under Magnetic Field p.130 Microstructural Observation on Materials of the Japanese Sword under Fold-Forging Process p.134 Evidence of Lath Martensite in High-C Japanese Sword Produced from Tamahagane Steel by Tatara Process p.138 Colored Metallography Study of Bainite Steel Used for High Speed Railway Crossing p.142 Relationship between Particle Size and Martensitic Transformation in an Fe-30at%Ni Alloy p.146 Spheroidization Behavior of Cementite in a High Carbon Steel p.150 Influence of Silicon on the Spheroidization of Cementite in Hypereutectoid Bearing Steels p.154 Home Materials Science Forum Materials Science Forum Vols. 654-656 Evidence of Lath Martensite in High-C Japanese... Evidence of Lath Martensite in High-C Japanese Sword Produced from Tamahagane Steel by Tatara Process Article Preview Abstract: Field Emission Scanning Electron Microscopy with Electron Back-Scattering Diffraction (SEM-EBSD) and Optical microscopy were used to point out the microstructural features of a Japanese sword prepared from tamahagane steel using traditional method. A lath martensite structure, which is usually characterized by packet and block in a prior austenite grain, existed both on the surface and the cross-section of the sword. SEM-EBSD study revealed that the development of prior austenite grain and packet were not much distinctive but the blocks within the packets were fairly observed. It was found that the packet size increased with the prior austenite grain size but the increment was small. Vickers micro-hardness measurement revealed that the sharp end was comparatively harder than other sections of the sword. EPMA study showed that the average carbon content of the sword was around 1 mass% along with a variety of non-metallic inclusions. Formation of lath martensite structure in such high carbon steel is remarkable but comparable to 0.6 mass% carbon ordinary steel. It was realized that the traditional method of preparation using tamahagane as well as the higher content of carbon provided the extraordinary features to the Japanese sword different from the ordinary steel. Access through your institution Read The Paper You might also be interested in these eBooks View Preview Info: Periodical: Materials Science Forum (Volumes 654-656) Pages: 138-141 DOI: https://doi.org/10.4028/www.scientific.net/MSF.654-656.138 DOI link Citation: Cite this paper Online since: June 2010 Authors: Ananda Kumar Das , Takuya Ohba , Shigekazu Morito , Muneo Yaso Keywords: High-C Steel , Japanese Sword , Lath Martensite , SEM-EBSD , Tamahagane , Tatara Export: RIS , BibTeX Price: Permissions CCC: Request Permissions Permissions PLS: Request Permissions Сopyright: © 2010 Trans Tech Publications Ltd. All Rights Reserved Share: Citation: References [1] M.R. Barnett, A.

as "stainless Damascus". Toledo steel Crucible steel Wootz steel Noric steel Bulat steel Tamahagane steel Mokume-gane Laminated steel blade Figiel, Leo Damascus steel (Arabic: فولاذ دمشقي, romanized: fūlāḏ Damašqiyy) is the high-carbon crucible steel of the blades of historical swords forged using the wootz process in the Near East, characterized by distinctive patterns of banding and mottling reminiscent of flowing water, sometimes in a "ladder" or "rose" pattern. Damascus steel was reputed to be tough, resistant to shattering, and capable of be Recreating Damascus steel has been attempted by archaeologists using experimental archaeology. Many have attempted to discover or reverse-engineer the process by which it was made. "Damascene Technique in Metal Working" Verhoeven, J.D. (2007). "Pattern Formation in Wootz Damascus Steel Swords and Blades" (PDF). Indian Journal of History of Science. 42 (4): 559–574. Archived (PDF) from the original on 2017-12-12. John Verhoeven: Mystery of Damascus Steel Swords Unveiled Loades, Mike; Pendray, Al (21 November 2017). The Secrets of Wootz Damascus Steel. YouTube. Archived from the original on 2021-11-17. US 5185044, Verhoeven, J.D. & Pendray, A.H., "Method of making "Damascus" blades", published 9 February 1993 Celadonerkiki (January 13, 2024) What is the difference between Wootz Steel and Damascus? swordier. Andrew North (August 8, 2024) An Idiot's Guide to Damascus Steel Knives: A Simplified but Hopefully Comprehensive Overview of Damascus and Wootz Steel for People Who Don't Read Good nothingbutknives.com Larrin (April 22, 2024) Damascus, Steel and Knife Properties Wootz – The True Damascus Steel? Knife Steel Nerds for the more technically inclined. Damascus steel (Arabic: فولاذ دمشقي, romanized: fūlāḏ Damašqiyy) is the high-carbon crucible steel of the blades of historical swords forged using the wootz process in the Near East, characterized by distinctive patterns of banding and mottling reminiscent of flowing water, sometimes in a "ladder" or "rose" pattern. Damascus steel was reputed to be tough, resistant to shattering, and capable of being honed to a sharp, resilient edge. This is not to be confused with damascene, which is a form of metal inlaying. Originally, it came from India and Sri Lanka, where the steel-making techniques used were first developed. Arabic adopted the word for steel from pre-New Persian pōlād. The term "Damascus steel" is rooted in the medieval city of Damascus, perhaps as an early example of branding. However, there is now a general agreement that many of the swords, or at least the steel ingots from which they were forged, were imported from elsewhere. Damascus blades were first manufactured in the Near East from ingots of wootz steel that were imported from Southern India (present-day Telangana, Tamil Nadu, Karnataka and Kerala). Al-Kindi states that crucible steel was also made in Khorasan known as Muharrar, in addition to steel that was imported. There was also domestic production of crucible steel outside of India, including Merv (Turkmenistan) and Yazd, Iran. In addition to being made into blades in India (particularly Golconda) and Sri Lanka, wootz / ukku was exported as ingots to various production centers, including Khorasan, and Isfahan, where the steel was used to produce blades, as well as across the Middle East. The Arabs introduced the wootz steel to Damascus, where a weapons industry thrived. From the 3rd century to the 17th century, steel ingots were being shipped to the Middle East from South India. During the smelting process to obtain wootz steel ingots, woody biomass and leaves are known to have been used as carburizing additives along with certain specific types of iron rich in microalloying elements. These ingots would then be further forged and worked into Damascus steel blades. Research now shows that carbon nanotubes can be derived from plant fibers, suggesting how the nanotubes were Due to the distance of trade for this steel, a sufficiently lengthy disruption of the trade routes could have ended the production of Damascus steel and eventually led to the loss of the technique. Key trace impurities of carbide formers such as tungsten, vanadium, or manganese within the materials needed for the production of the steel may be absent if this material was acquired from different production regions or smelted from ores lacking these key trace elements. The technique for controlled thermal cycling after the initial forging at a specific temperature could also have been lost, thereby preventing the final damask pattern in the steel from occurring. The disruption of mining and steel manufacture by the British Raj in the form of production taxes and export bans may have also contributed to a loss of knowledge of key ore sources or key techniques. Recreating Damascus steel has been attempted by archaeologists using experimental archaeology. Many have attempted to discover or reverse-engineer the process by which it was made. "Damascene Technique in Metal Working" Verhoeven, J.D. (2007). "Pattern Formation in Wootz Damascus Steel Swords and Blades" (PDF). Indian Journal of History of Science. 42 (4): 559–574. Archived (PDF) from the original on 2017-12-12. John Verhoeven: Mystery of Damascus Steel Swords Unveiled Loades, Mike; Pendray, Al (21 November 2017). The Secrets of Wootz Damascus Steel. YouTube. Archived from the original on 2021-11-17. US 5185044, Verhoeven, J.D. & Pendray, A.H., "Method of making "Damascus" blades", published 9 February 1993 Celadonerkiki (January 13, 2024) What is the difference between Wootz Steel and Damascus? swordier. Andrew North (August 8, 2024) An Idiot's Guide to Damascus Steel Knives: A Simplified but Hopefully Comprehensive Overview of Damascus and Wootz Steel for People Who Don't Read Good nothingbutknives.com Larrin (April 22, 2024) Damascus, Steel and Knife Properties Wootz – The True Damascus Steel? Knife Steel Nerds for the more technically inclined.

Made few centuries ago, the technology behind Damascus steel and its fine ingredients remain still a mystery. The birth of modern metallurgy was catalysed by Damascus steel. It has a high strength in terms of yield stress and ultimate tensile strength. It can be identified by the unique surface texture due to combination of metals with different carbon percentages. Even though the appearance was reconstructed with reasonable physical properties, features such as existence of multiwalled carbon nanotubes make it unique compared to modern day replications.

Noric steel Pelletizing Rolling Rolling mill Rust Belt Second Industrial Revolution Silicon steel Steel abrasive Steel mill Tamahagane, used in Japanese Steel is an alloy of iron and carbon that demonstrates improved mechanical properties compared to the pure form of iron. Due to its high elastic modulus, yield strength, fracture strength and low raw material cost, steel is one of the most commonly manufactured materials in the world. Steel is used in structures (as concrete reinforcing rods or steel beams), in bridges, infrastructure, tools, ship Ste… Evidence of the earliest production of high carbon steel in South Asia is found in Kodumanal in Tamil Nadu, the Golconda area in Telangana and Karnataka, regions of India, as well as in Samanalawewa and Dehigaha Alakanda, regions of Sri Lanka. This came to be known as wootz steel, produced in South India by about the sixth century BC and exported globally. The steel technology existed prior to 326 BC in the region as they are mentioned in literature of Sangam Tamil, Arabic, and Latin as the finest steel in the world exported to the Roman, Egyptian, Chinese and Arab worlds at that time – what they called Seric iron. A 200 BC Tamil trade guild in Tissamaharama, in the South East of Sri Lanka, brought with them some of the oldest iron and steel artifacts and production processes to the island from… Since the 17th century, the first step in European steel production has been the smelting of iron ore into pig iron in a blast furnace. Originally employing charcoal, modern methods use coke, which has proven more economical. Cast iron is not malleable even when hot, but it can be formed by casting as it has a lower melting point than steel and good castability properties. Certain compositions of cast iron, while retaining the economies of melting and casting, can be heat treated after casting to make malleable iron or ductile iron objects. Steel is distinguishable from wrought iron (now largely obsolete), which may contain a small amount of carbon A (<0.1 %) but large amounts of slag (around 1–2%). == Production == When iron is smelted from its ore with coke or charcoal, the result has a high amount of carbon and is known as pig iron. All of these temperatures could be reached with ancient methods used since the Bronze Age. Since the oxidation rate of iron increases rapidly beyond 800 °C (1,470 °F), it is important that smelting takes place in a low-oxygen environment. Smelting, using carbon to reduce iron oxides, results in an alloy (pig iron) that retains too much carbon to be called steel. The excess carbon and other impurities are removed via further processing. Other materials are often added to the iron/carbon mixture to produce steel with the desired properties. There is evidence that carbon steel was made in Western Tanzania by the ancestors of the Haya people as early as 2,000 years ago by a complex process of "pre-heating" allowing temperatures inside a furnace to reach 1300 to 1400 °C. === Wootz and Damascus === Evidence of the earliest production of high carbon steel in South Asia is found in Kodumanal in Tamil Nadu, the Golconda area in Telangana and Karnataka, regions of India, as well as in Samanalawewa and Dehigaha Alakanda, regions of Sri Lanka. This came to be known as wootz steel, produced in South India by about the sixth century BC and exported globally. In Sri Lanka, this early steel-making method employed a unique wind furnace, driven by the monsoon winds, capable of producing high-carbon steel. Since the technology was acquired from the Tamilians from South India, the origin of steel technology in India can be conservatively estimated at 400–500 BC. The manufacture of wootz steel and Damascus steel, famous for its durability and ability to hold an edge, may have been taken by the Arabs from Persia, who took it from India. In 327 BC, Alexander the Great was rewarded by the defeated King Porus, not with gold or silver but with 30 pounds of steel. One such furnace was found in Samanalawewa and archaeologists were able to produce steel as the ancients did. Crucible steel, formed by slowly heating and cooling pure iron and carbon (typically in the form of charcoal) in a crucible, was produced in Merv by the 9th to 10th century AD. In the 11th century, there is evidence of the production of steel in Song China using two techniques: a "berganesque" method that produced inferior, inhomogeneous steel, and a precursor to the modern Bessemer process that used partial decarburization via repeated forging under a cold blast. The early modern crucible steel industry resulted from the invention of Benjamin Huntsman in the 1740s. Blister steel (made as above) was melted in a crucible or in a furnace, and cast (usually) into ingots. ==== Processes starting from pig iron ==== The modern era in steelmaking began with the introduction of Henry Bessemer's process in 1855, the raw material for which was pig iron. His method let him produce steel in large quantities cheaply, thus mild steel came to be used for most purposes for which wrought iron was formerly used. The Gilchrist-Thomas process (or basic Bessemer process) was an improvement to the Bessemer process, made by lining the converter with a basic material to remove phosphorus. Another 19th-century steelmaking process was the Siemens-Martin process, which complemented the Bessemer process, which originally consisted of co-melting wrought-iron scrap with pig iron. These methods of steel production were rendered obsolete by the Linz-Donawitz process of basic oxygen steelmaking (BOS), developed in 1952, and other oxygen steel making methods. In 2005, the British Geological Survey stated China was the top steel producer with about one-third of the world share; Japan, Russia, and the United States were second, third, and fourth, respectively, according to the survey. At the end of 2008, the steel industry faced a sharp downturn that led to many cut-backs. Steelmaking is a