Lecture

Advanced Steels: Properties and Applications

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In course

MSE-422: Advanced metallurgy

This course covers the metallurgy, processing and properties of modern high-performance metals and alloys (e.g. advanced steels, Ni-base, Ti-base, High Entropy Alloys etc.). In addition, the principles of computational alloy design as well as approaches fo ...

Description

This lecture covers the fundamentals of steel metallurgy, an overview of high-performance steel classes, including stainless steels, steels for elevated temperature applications, and advanced high strength steels. It discusses the history, properties, and microstructures of advanced high strength steels, as well as the influence of Mn content on their properties. The lecture also explores TRansformation-Induced Plasticity (TRIP) and Twinning-Induced Plasticity (TWIP) steels, their mechanical properties, and the role of stacking fault energy on the deformation mechanism. Furthermore, it delves into the applications of Advanced High Strength Steels in modern car body structures, emphasizing their lightweight, safety, design flexibility, and sustainability through recycling.

Instructor

Christian Leinenbach

Official source

Ontological neighbourhood

Chemical engineering

Materials science: Alloys

Related concepts (32)

Steel

Steel is an alloy of iron and carbon with improved strength and fracture resistance compared to other forms of iron. Many other elements may be present or added. Stainless steels, which are resistant to corrosion and oxidation, typically need an additional 11% chromium. Because of its high tensile strength and low cost, steel is used in buildings, infrastructure, tools, ships, trains, cars, bicycles, machines, electrical appliances, furniture, and weapons. Iron is the base metal of steel.

Carbon steel

Carbon steel is a steel with carbon content from about 0.05 up to 2.1 percent by weight. The definition of carbon steel from the American Iron and Steel Institute (AISI) states: no minimum content is specified or required for chromium, cobalt, molybdenum, nickel, niobium, titanium, tungsten, vanadium, zirconium, or any other element to be added to obtain a desired alloying effect; the specified minimum for copper does not exceed 0.40%; or the specified maximum for any of the following elements does not exceed the percentages noted: manganese 1.

Austenite

Austenite, also known as gamma-phase iron (γ-Fe), is a metallic, non-magnetic allotrope of iron or a solid solution of iron with an alloying element. In plain-carbon steel, austenite exists above the critical eutectoid temperature of 1000 K (727 °C); other alloys of steel have different eutectoid temperatures. The austenite allotrope is named after Sir William Chandler Roberts-Austen (1843–1902); it exists at room temperature in some stainless steels due to the presence of nickel stabilizing the austenite at lower temperatures.

Ferrous metallurgy

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, and sub-Saharan Africa. The use of wrought iron (worked iron) was known by the 1st millennium BC, and its spread defined the Iron Age.

Diffusionless transformation

Diffusionless transformations, also referred to as displacive transformations, are solid-state changes in the crystal structure that do not rely on the diffusion of atoms over long distances. Instead, they occur due to coordinated shifts in atomic positions, where atoms move by a distance less than the span between neighboring atoms while maintaining their relative arrangement. An illustrative instance of this is the martensitic transformation observed in steel.

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Metallurgy: Martensitic Transformation and TTT Diagrams

Discusses martensitic transformation in metals, focusing on TTT diagrams and the effects of cooling rates on phase formation.

Steel Heat Treatment: Transformation Diagrams

Covers the transformation diagrams of steel and the effects of alloying elements on the transformation process.

Metallurgy Fundamentals

Covers the fundamentals of metallurgy, including world reserves of metals, shaping processes, heat treatments, and steel properties.

Dislocations and Deformation

Explores dislocations in crystals, deformation mechanisms, and the effects of obstacles on dislocation movement.

Advanced Steels