There is, I think, something ethereal about i —the square root of minus one. I remember first hearing about it at school. It seemed an odd beast at that time—an intruder hovering on the edge of reality.

Usually familiarity dulls this sense of the bizarre, but in the case of i it was the reverse: over the years the sense of its surreal nature intensified. It seemed that it was impossible to write mathematics that described the real world in …

I and i

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The Science And Engineering Of Materials

Developing ultrahigh-strength steels that are ductile, fracture resistant, and cost effective would be attractive for a variety of structural applications. We show that improved fracture resistance in a steel with an ultrahigh yield strength of nearly 2 gigapascals can be achieved by activating delamination toughening coupled with transformation-induced plasticity. Delamination toughening associated with intensive but controlled cracking at manganese-enriched prior-austenite grain boundaries normal to the primary fracture surface dramatically improves the overall fracture resistance. As a result, fracture under plane-strain conditions is automatically transformed into a series of fracture processes in "parallel" plane-stress conditions through the thickness. The present "high-strength induced multidelamination" strategy offers a different pathway to develop engineering materials with ultrahigh strength and superior toughness at economical materials cost.

/pdf/making-ultrastrong-steel-tough-by-grain-boundary-7k7boxx4bj.pdf

Making ultrastrong steel tough by grain-boundary delamination

Understanding the main relationships between the microstructure parameters controlling the strength and ductility of low temperature bainitic microstructures is of considerable importance for further development of these grades. Although the microstructure essentially consists of solely two phases, bainitic ferrite and retained austenite, the complexity of the different microstructural characteristics, the natural consequence of its unique transformation mechanisms, might not provide with one unique answer, but a set of several parameters interdependent among them. This paper will deal with some of these relationships’ microstructure properties, strength, and ductility, with special emphasis in the mechanical stability (TRIP effect) of retained austenite.

/pdf/strengthening-and-mechanical-stability-mechanisms-in-177cdlyge8.pdf

Strengthening and mechanical stability mechanisms in nanostructured bainite

http://hj.diva-portal.org/smash/get/diva2:824554/FULLTEXT01

High temperature tensile deformation behavior and failure mechanisms of an Al–Si–Cu–Mg cast alloy — The microstructural scale effect

http://hj.diva-portal.org/smash/get/diva2:680982/FULLTEXT01

Characterisation and investigation of local variations in mechanical behaviour in cast aluminium using gradient solidification, Digital Image Correlation and finite element simulation

http://hj.diva-portal.org/smash/get/diva2:457629/FULLTEXT01

Incorporating predicted local mechanical behaviour of cast components into finite element simulations

The effects of local variations in mechanical behaviour – Numerical investigation of a ductile iron component

This paper investigates the effect of the solidification conditions and silicon content on the mechanical properties of ductile iron and presents empirical models for predicting the tensile behavio ...

Jakob Olofsson

Papers

Characterisation and investigation of local variations in mechanical behaviour in cast aluminium using gradient solidification, Digital Image Correlation and finite element simulation

Incorporating predicted local mechanical behaviour of cast components into finite element simulations

The effects of local variations in mechanical behaviour – Numerical investigation of a ductile iron component

Characterization and modeling of the mechanical behavior of high silicon ductile iron

Effects of workpiece microstructure, mechanical properties and machining conditions on tool wear when milling compacted graphite iron