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32:57 University of Cambridge English 2013

Quenching and Partitioning: Science and Technology

A lecture given by John Speer, at the Adventures in the Physical Metallurgy of Steels (APMS) conference held in Cambridge University. The quench and partitioning process involves partial transformation to martensite, followed by an increase in temperature to permit the excess carbon to partition into the residual austenite. The quenching and partitioning (Q&P) concept was first introduced about a decade ago, to utilise carbon in as-quenched martensite to stabilise retained austenite and thereby enhance the mechanical properties. This presentation will provide an update of advancements made in understanding important aspects of physical metallurgy and microstructure development, within the authors laboratories and elsewhere, which have led to interest in Q&P as a potential route for producing commercial steels in volume. A variety of applications have been explored in Q&P laboratory investigations. Initial industrialisation has focused on automotive sheet steels, and substantial activity is now underway to meet aggressive near-term targets for vehicle lightweighting using Q&P steels or other novel approaches to generate microstructures with enhanced austenite fractions. The current status of some of these efforts will be reported.
  • Published: 2013
  • Publisher: University of Cambridge
  • Language: English
1:16:11 University of Cambridge English 2014

Modern Steel Products (2014) - Fe-C phase diagram: lecture 3

A lecture about the iron-carbon equilibrium phase diagram. This is a part of a course of lectures by Professor Bruno de Cooman, of the Graduate Institute of Ferrous Technology, POSTECH, Republic of Korea. This comprehensive course leads the audience through a large variety of metallurgical aspects that influence steel products.
  • Published: 2014
  • Publisher: University of Cambridge
  • Language: English
1:07:41 University of Cambridge English 2014

Modern Steel Products (2014) - Standards, Ironmaking: lecture 7

Professor de Cooman finishes his lecture on "Standards" and begins one on ironmaking using the blast furnace. This is a part of a course of lectures by Professor Bruno de Cooman, of the Graduate Institute of Ferrous Technology, POSTECH, Republic of Korea.
  • Published: 2014
  • Publisher: University of Cambridge
  • Language: English
1:18:27 University of Cambridge English 2015

Modern Steel Products (2015) - lecture 3

A series of lectures on steels, given by Professor Bruno de Cooman, Graduate Institute of Ferrous Technology (GIFT), POSTECH, Republic of Korea
  • Published: 2015
  • Publisher: University of Cambridge
  • Language: English
31:33 University of Cambridge English 2013

Atoms in bainite, atomic mechanisms: APMS conference

A lecture given by Francisca Garcia Caballero, at the Adventures in the Physical Metallurgy of Steels (APMS) conference held in Cambridge University. The atomic mechanism of the bainite transformation is discussed in the context of the highest resolution analytical experiments conceivable. After decades of debate on the mechanism for the formation of bainite, it is accepted that bainite grows via a displacive mechanism i.e., as plate-shaped transformation products exhibiting an invariant plane strain surface relief effect. But there is still much discussion on the diffusion or diffusionless nature of bainite. Elements of the theory are now routinely being used in the design of innovative steels and in the interpretation of a variety of experimental data. However, current experimental and theoretical understanding is limiting technological progress. The purpose of this atom probe tomography study was to track the atom distributions during the bainite reaction in steels with different carbon and silicon contents transformed over a wide range of temperatures (200-525 centigrade) to elucidate the role of reaction rate and diffusion in the formation of bainite with and without cementite precipitation. The results are providing new experimental evidence on subjects critically relevant to the understanding of the atomic mechanisms controlling bainitic ferrite formation, such as the incomplete transformation phenomenon, the carbon supersaturation of ferrite, the plastic accommodation of the surrounding austenite and cluster and carbides formation.
  • Published: 2013
  • Publisher: University of Cambridge
  • Language: English
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