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Wootz steel is a crucible steel characterized by a pattern of bands and high carbon content. These bands are formed by sheets of microscopic carbides within a tempered martensite or pearlite matrix in higher-carbon steel, or by ferrite and pearlite banding in lower-carbon steels. It was a pioneering steel alloy developed in southern India in the mid-1st millennium BC and exported globally. [1]
Wootz steel originated in the mid-1st millennium BC in India, wootz steel was made in Golconda in Telangana, Karnataka and Sri Lanka. [2] [3] [4] [5] The steel was exported as cakes of steely iron that came to be known as "wootz". [6] The method was to heat black magnetite ore in the presence of carbon in a sealed clay crucible inside a charcoal furnace to completely remove slag. An alternative was to smelt the ore first to give wrought iron, then heat and hammer it to remove slag. The carbon source was bamboo and leaves from plants such as Avārai. [6] [7] Locals in Sri Lanka adopted the production methods of creating wootz steel from the Cheras by the 5th century BC. [8] In Sri Lanka, this early steel-making method employed a unique wind furnace, driven by the monsoon winds. Production sites from antiquity have emerged, in places such as Anuradhapura, Tissamaharama and Samanalawewa, as well as imported artifacts of ancient iron and steel from Kodumanal. Recent archaeological excavations (2018) of the Yodhawewa site (in Mannar District) discovered the lower half of a spherical furnace, crucible fragments, and lid fragments related to the crucible steel production through the carburization process. [9] In the South East of Sri Lanka, there were some of the oldest iron and steel artifacts and production processes to the island from the classical period. [10] [11] [12] [13]
Trade between India and Sri Lanka through the Arabian Sea introduced wootz steel to Arabia. The term muhannad مهند or hendeyy هندي in pre-Islamic and early Islamic Arabic refers to sword blades made from Indian steel, which were highly prized, and are attested in Arabic poetry. Further trade spread the technology to the city of Damascus, where an industry developed for making weapons of this steel. This led to the development of Damascus steel. The 12th century Arab traveler Edrisi mentioned the "Hinduwani" or Indian steel as the best in the world. [14] Arab accounts also point to the fame of 'Teling' steel, which can be taken to refer to the region of Telangana. The Golconda region of Telangana clearly being the nodal center for the export of wootz steel to West Asia. [14]
Another sign of its reputation is seen in a Persian phrase –to give an "Indian answer", meaning "a cut with an Indian sword". [8] Wootz steel was widely exported and traded throughout ancient Europe and the Arab world, and became particularly famous in the Middle East. [8]
From the 17th century onwards, several European travelers observed the steel manufacturing in South India, at Mysore, Malabar and Golconda. The word "wootz" appears to have originated as a mistranscription of Sanskrit terms; the Sanskrit root word for the alloy is utsa. [15] Another[ which? ]theory says that the word is a variation of uchcha or ucha[ dubious – discuss ] ("superior"). According to one theory, the word ukku is based on the meaning "melt, dissolve". Other Dravidian languages have similar-sounding words for steel: ukku in Kannada [16] [17] and Telugu, and urukku in Malayalam. When Benjamin Heyne inspected the Indian steel in Ceded Districts and other Kannada-speaking areas, he was informed that the steel was ucha kabbina ("superior iron"), also known as ukku tundu in Mysore. [18] [19]
Legends of wootz steel and Damascus swords aroused the curiosity of the European scientific community from the 17th to the 19th century. The use of high-carbon alloys was little known in Europe [20] previously and thus the research into wootz steel played an important role in the development of modern English, French and Russian metallurgy. [21]
In 1790, samples of wootz steel were received by Sir Joseph Banks, president of the British Royal Society, sent by Helenus Scott. These samples were subjected to scientific examination and analysis by several experts. [22] [23] [24]
Specimens of daggers and other weapons were sent by the Rajas of India to the Great Exhibition in London in 1851 and 1862 International Exhibition. Though the arms of the swords were beautifully decorated and jeweled, they were most highly prized for the quality of their steel. The swords of the Sikhs were said to bear bending and crumpling, and yet be fine and sharp. [8]
Wootz is characterized by a pattern caused by bands of clustered Fe
3C particles made by melting of low levels of carbide-forming elements. [25] Wootz contains greater carbonaceous matter than common qualities of cast steel.[ citation needed ]
The distinct patterns of wootz steel that can be made through forging are wave, ladder, and rose patterns with finely spaced bands. However, with hammering, dyeing, and etching further customized patterns were made. [26]
The presence of cementite nanowires and carbon nanotubes has been identified by Peter Pepler of TU Dresden in the microstructure of wootz steel. [27] There is a possibility of an abundance of ultrahard metallic carbides in the steel matrix precipitating out in bands. Wootz swords were renowned for their sharpness and toughness.
T. H. Henry analyzed and recorded the composition of wootz steel samples provided by the Royal School of Mines. Recording:
Wootz steel was analyzed by Michael Faraday and recorded to contain 0.01-0.07% aluminium. Faraday, Messrs (et al.), and Stodart hypothesized that aluminium was needed in the steel and was important in forming the excellent properties of wootz steel. However T. H. Henry deduced that presence of aluminium in the wootz used by these studies was due to slag, forming as silicates. Percy later reiterated that the quality of wootz steel does not depend on the presence of aluminium. [28]
Wootz steel has been reproduced and studied in depth by the Royal School of Mines. [29] Dr. Pearson was the first to chemically examine wootz in 1795 and he published his contributions to the Philosophical Transactions of the Royal Society. [30]
Russian metallurgist Pavel Petrovich Anosov (see Bulat steel) was almost able to reproduce ancient wootz steel with nearly all of its properties and the steel he created was very similar to traditional wootz.[ citation needed ] He documented four different methods of producing wootz steel that exhibited traditional patterns.[ citation needed ] He died before he could fully document and publish his research. Oleg Sherby and Jeff Wadsworth and Lawrence Livermore National Laboratory have all done research, attempting to create steels with characteristics similar to wootz, but without success.[ citation needed ] J.D Verhoeven and Alfred Pendray reconstructed methods of production, proved the role of impurities of ore in the pattern creation, and reproduced wootz steel with patterns microscopically and visually identical to one of the ancient blade patterns.[ citation needed ] Reibold et al.'s analyses spoke of the presence of carbon nanotubes enclosing nanowires of cementite, with the trace elements/impurities of vanadium, molybdenum, chromium etc. contributing to their creation, in cycles of heating/cooling/forging. This resulted in a hard high carbon steel that remained malleable [31]
There are smiths who are now consistently producing wootz steel blades visually identical to the old patterns. [32] Steel manufactured in Kutch particularly enjoyed a widespread reputation, similar to those manufactured at Glasgow and Sheffield. [8]
Wootz was made over nearly a 2,000-year period (the oldest sword samples date to around 200 CE)[ citation needed ] and the methods of production of ingots, the ingredients, and the methods of forging varied from one area to the next. Some wootz blades displayed a pattern, while some did not.[ citation needed ] Heat treating was quite different from forging, and there were many different patterns that were created by the various smiths who spanned from China to Scandinavia.[ citation needed ]
With fellow experts, the Georgian-Dutch master armourer Gocha Laghidze developed a new method to reintroduce 'Georgian Damascus steel'. In 2010, he and his colleagues gave a masterclass on this at the Royal Academy of Fine Arts in Antwerp. [33] [34]
Damascus steel refers to 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" developed a high reputation for being tough, resistant to shattering, and capable of being honed to a sharp, resilient edge.
The Iron Age is the final epoch of the three historical Metal Ages, after the Chalcolithic and Bronze Age. It has also been considered as the final age of the three-age division starting with prehistory and progressing to protohistory. In this usage, it is preceded by the Stone Age and Bronze Age. These concepts originated for describing Iron Age Europe and the Ancient Near East. The indigenous cultures of the New World did not develop an iron economy before 1500.
Pattern welding is an practice in sword and knife making by forming a blade of several metal pieces of differing composition that are forge-welded together and twisted and manipulated to form a pattern. Often mistakenly called Damascus steel, blades forged in this manner often display bands of slightly different patterning along their entire length. These bands can be highlighted for cosmetic purposes by proper polishing or acid etching. Pattern welding was an outgrowth of laminated or piled steel, a similar technique used to combine steels of different carbon contents, providing a desired mix of hardness and toughness. Although modern steelmaking processes negate the need to blend different steels, pattern welded steel is still used by custom knifemakers for the cosmetic effects it produces.
Steel is an alloy of iron and carbon with improved strength and fracture resistance compared to other forms of iron. Because of its high tensile strength and low cost, steel is one of the most commonly manufactured materials in the world. Steel is used in buildings, as concrete reinforcing rods, in bridges, infrastructure, tools, ships, trains, cars, bicycles, machines, electrical appliances, furniture, and weapons.
A sword is an edged, bladed weapon intended for manual cutting or thrusting. Its blade, longer than a knife or dagger, is attached to a hilt and can be straight or curved. A thrusting sword tends to have a straighter blade with a pointed tip. A slashing sword is more likely to be curved and to have a sharpened cutting edge on one or both sides of the blade. Many swords are designed for both thrusting and slashing. The precise definition of a sword varies by historical epoch and geographic region.
Bulat is a type of steel alloy known in Russia from medieval times; it was regularly mentioned in Russian legends as the material of choice for cold steel. The name булат is a Russian transliteration of the Persian word fulad, meaning steel. This type of steel was used by the armies of nomadic peoples. Bulat steel was the main type of steel used for swords in the armies of Genghis Khan. Bulat steel is generally agreed to be a Russian name for wootz steel, the production method of which has been lost for centuries, and the bulat steel used today makes use of a more recently developed technique.
Crucible steel is steel made by melting pig iron, iron, and sometimes steel, often along with sand, glass, ashes, and other fluxes, in a crucible. Crucible steel was first developed in the middle of the 1st millennium BCE in Southern India and Sri Lanka using the wootz process.
A bloomery is a type of metallurgical furnace once used widely for smelting iron from its oxides. The bloomery was the earliest form of smelter capable of smelting iron. Bloomeries produce a porous mass of iron and slag called a bloom. The mix of slag and iron in the bloom, termed sponge iron, is usually consolidated and further forged into wrought iron. Blast furnaces, which produce pig iron, have largely superseded bloomeries.
Tamahagane (玉鋼) is a type of steel made in the Japanese tradition. The word tama means 'precious', and the word hagane means 'steel'. Tamahagane is used to make Japanese swords, daggers, knives, and other kinds of tools.
The history of metallurgy in the Indian subcontinent began prior to the 3rd millennium BCE. Metals and related concepts were mentioned in various early Vedic age texts. The Rigveda already uses the Sanskrit term ayas. The Indian cultural and commercial contacts with the Near East and the Greco-Roman world enabled an exchange of metallurgic sciences. The advent of the Mughals further improved the established tradition of metallurgy and metal working in India. During the period of British rule in India, the metalworking industry in India stagnated due to various colonial policies, though efforts by industrialists led to the industry's revival during the 19th century.
The Chera dynasty, was a Sangam age Tamil dynasty which unified various regions of the western coast and western ghats in southern India to form the early Chera empire. The dynasty, known as one of the Three Crowned Kings of Tamilakam alongside the Chola and Pandya, has been documented as early as the 4th to 3rd centuries BCE. Their governance extended over diverse territories until the 12th century CE.
The following is a chronological overview of the history of the Tamil people, who trace their ancestry to the Indian state of Tamil Nadu, the Indian union territory of Puducherry, the Northern and Eastern Provinces of Sri Lanka and the Puttalam District of Sri Lanka.
Bladesmithing is the art of making knives, swords, daggers and other blades using a forge, hammer, anvil, and other smithing tools. Bladesmiths employ a variety of metalworking techniques similar to those used by blacksmiths, as well as woodworking for knife and sword handles, and often leatherworking for sheaths. Bladesmithing is an art that is thousands of years old and found in cultures as diverse as China, Japan, India, Germany, Korea, the Middle East, Spain and the British Isles. As with any art shrouded in history, there are myths and misconceptions about the process. While traditionally bladesmithing referred to the manufacture of any blade by any means, the majority of contemporary craftsmen referred to as bladesmiths are those who primarily manufacture blades by means of using a forge to shape the blade as opposed to knifemakers who form blades by use of the stock removal method, although there is some overlap between both crafts.
In swordsmithing, hamon (刃文) is a visible effect created on the blade by the hardening process. The hamon is the outline of the hardened zone which contains the cutting edge. Blades made in this manner are known as differentially hardened, with a harder cutting edge than spine. This difference in hardness results from clay being applied on the blade prior to the cooling process (quenching). Less or no clay allows the edge to cool faster, making it harder but more brittle, while more clay allows the center and spine to cool slower, thus retaining its resilience.
Noric steel is a historical steel from Noricum, a kingdom located in modern Austria and Slovenia.
Ferrous metallurgy is the metallurgy of iron and its alloys. The earliest surviving prehistoric iron artifacts, from the 4th millennium BC in Egypt, were made from meteoritic iron-nickel. It is not known when or where the smelting of iron from ores began, but by the end of the 2nd millennium BC iron was being produced from iron ores in the region from Greece to India, The use of wrought iron was known by the 1st millennium BC, and its spread defined the Iron Age. During the medieval period, smiths in Europe found a way of producing wrought iron from cast iron, in this context known as pig iron, using finery forges. All these processes required charcoal as fuel.
Sharada SrinivasanFRAS FAAAS is an archaeologist specializing in the scientific study of art, archaeology, archaeometallurgy and culture. She is a Professor at the National Institute of Advanced Studies, Bangalore, India, and an Honorary University Fellow at the University of Exeter, UK. Srinivasan is also an exponent of classical Bharatanatyam dance. She was awarded India's fourth highest civilian award the Padma Shri in 2019. She is a member of the Calamur family.
A laminated steel blade or piled steel is a knife, sword, or other tool blade made out of layers of differing types of steel, rather than a single homogeneous alloy. The earliest steel blades were laminated out of necessity, due to the early bloomery method of smelting iron, which made production of steel expensive and inconsistent. Laminated steel offered both a way to average out the properties of the steel, as well as a way to restrict high carbon steel to the areas that needed it most. Laminated steel blades are still produced today for specialized applications, where different requirements at different points in the blade are met by use of different alloys, forged together into a single blade.
Early Japanese iron-working techniques are known primarily from archaeological evidence dating to the Asuka period. Iron was first brought to Japan during the earlier Yayoi period. Iron artifacts of the period include farm implements, arrowheads, and rarely a knife blade. An ironworking industry likely evolved during the late Yayoi or the Kofun period, when iron weapons and armor became more common. However, the best archaeological evidence for early iron-working techniques in Japan dates to the Asuka period, after Buddhism had been introduced to the imperial court of the Yamato state.
The Iron and Steel industry in India is among the most important industries within the country. India surpassed Japan as the second largest steel producer in January 2019. As per worldsteel, India's crude steel production in 2018 was at 106.5 million tonnes (MT), 4.9% increase from 101.5 MT in 2017, which means that India overtook Japan as the world's second largest steel production country. Japan produced 104.3 MT in year 2018, decrease of 0.3% compared to year 2017.
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