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The history of road versions of Audi racing cars begins in the 1980s, from models Audi Quattro and Audi Sport Quattro made by concern Audi AG in the city of Ingolstadt.In 1983, the company Quattro GmbH was founded (since November 2016, "Audi Sport GmbH") in the city of Neckarsulm responsible for the development of sports models of cars of Audi brand.
Photomicrograph of martensite, a very hard microstructure formed when steel is quenched.Tempering reduces the hardness in the martensite by transforming it into various forms of tempered martensite.
Anthropologists believe copper to be the first metal used by humans due to its softness and ease of manipulation. In antiquity, copper's durability and resistance to rust or corrosion proved valuable.
As a smithing god, Hephaestus made all the weapons of the gods in Olympus. He served as the blacksmith of the gods, and was worshipped in the manufacturing and industrial centres of Greece, particularly Athens. The cult of Hephaestus was based in Lemnos. [1] Hephaestus's symbols are a smith's hammer, anvil, and a pair of tongs.