Effect of cooling rate on phase transformations in a high-strength low-alloy steel studied from the liquid phase

The phase transformation and precipitation in a high-strength low-alloy steel have been studied over a large range of cooling rates, and a continuous cooling transformation (CCT) diagram has been produced. These experiments are unique because the measurements were made from samples cooled directly from the melt, rather than in homogenized and re-heated billets. The purpose of this experimental design was to examine conditions pertinent to direct strip casting. At the highest cooling rates which simulate strip casting, the microstructure was fully bainitic with small regions of pearlite. At lower cooling rates, the fraction of polygonal ferrite increased and the pearlite regions became larger. The CCT diagram and the microstructural analysis showed that the precipitation of NbC is suppressed at high cooling rates, and is likely to be incomplete at intermediate cooling rates.

New world orders in contemporary children's literature : utopian transformations

"New World Orders shows how texts for children and young people have responded to the cultural, economic, and political movements of the last 15 years. With a focus on international children's text produced between 1988 and 2006, the authors discuss how utopian and dystopian tropes are pressed into service to project possible futures to child readers. The book considers what these texts have to say about globalisation, neocolonialism, environmental issues, pressures on families and communities, and the idea of the posthuman."--BOOK JACKET.

Crystallographic analysis of nano-structured bainitic steels

A 0.79C-1.5Si-1.98Mn-0.98Cr-0.24Mo-1.06Al-1.58Co (wt%) steel was isothermally heat treated at 200 and 350°C bainitic transformation temperatures. The microstructure was consisted of bainitic ferrite lath and retained austenite for both heat treatment conditions. The crystallographic analysis revealed that the bainitic ferrite laths are close to the Nishiyama-Wassermann orientation relationship with their parent austenite. The isothermal bainite transformation temperature has a significant effect on the retained austenite characteristics and the variant selection of the bainitic ferrite laths. In general, a decrease in the isothennal bainite transformation temperature refined the bainitic structure and weakened the variant selection.

Feminine transports and transformations : textual performances of Australian women convicts and emigrants from 1788 to 1850

While scholars have critiqued early representations of the white colonial female in the form of the novel, short story, or historical narrative, analyses of poetry tend to be located only on that produced in Australia and often in light of a nascent national identity. This article examines how poetic renditions of the desolate woman might be viewed as part of imperialism's mythologising process, displacing more worrying versions of womanhood in relation to the new colonies. While social anxieties over the identity of the white colonial female would result in highly controlled productions of the female convict and female emigrant, this article demonstrates how they also prove unstable and point to a disruptive reality beyond language.

Transformations : landscape in recent Australian fiction / Gillian Mary Tyas

Focusing on novels written since 1980 by Australian authors Rodney Hall, Liam Davison, Tim Winton, Elizabeth Jolley and Gerald Murnane, and engaging with responses to the land by visual and performing artists, this thesis explores the idea that the writer and artist are mediators in the multitude of experiences that constitutes landscape.

Variant selection during the c-to-ab phase transformation in hot-rolled bainitic TRIP-aided steels

The variant selection phenomenon during the austenite to bainite phase transformation in hot-rolled TRIP-aided steels was quantitatively characterized at the level of individual austenite grains. The reconstruction of the electron backscatter diffraction maps provided evidence that bainite grows by packets of laths sharing a common {1 1 1}_y plane in the austenite. The affect of hot deformation is to reduce the number of packets that form. It is suggested that slip activity is important in understanding this effect.

63Cu NMR investigation of effect of small additions of Sn to Al-1.7 at.%Cu in promoting accelerated phase transformations on aging

Very recently 63Cu NMR has been shown to be extremely sensitive in detecting and differentiating between the precipitate phases that form in Al-Cu alloys during heat treatment. This technique is now used to quantify the effectiveness of small additions of Sn to the alloy Al-1.7 at.% Cu in promoting the rapid nucleation and growth of the θ'-phase precipitate. Two parallel series of 63Cu NMR spectra were recorded for Al-1.7 at.% Cu and Al-1.7 at.% Cu-0.01 at.% Sn: (i) aged at 130° C to observe the comparative rate of phase evolution and (ii) aged at 200° C to observe the rate of growth of θ'-phase and to compare with the Vickers hardness of the alloys aged at 200° C for similar periods. Evidence is presented that a metastable precursor phase to θ' (labelled TPHM2757math001) is formed in Al-Cu-Sn which transforms to θ' on further aging.

Enabling strategic transformations with enterprise systems : beyond operational efficiency

The last few decades have seen the widespread adoption of large-scale, integrated, packaged software suites collectively called Enterprise Systems. However, most studies done so far have largely focused on the operational efficiency achieved by using these systems. This paper reports on research-in-progress that seeks to explore the strategic potential of Enterprise Systems to enable business transformations. In doing so, a new model is proposed that places the emphasis on the potential of Enterprise Systems to achieve innovation and reshape business strategy, rather than merely focusing on operational benefits. This model proposes that Enterprise Systems, when used to integrate, optimise and informate, can help firms achieve alliance innovation, process innovation and reshaped business strategy. The paper also provides preliminary empirical evidence that supports the propositions. This model will be tested further through primary case studies and a survey. This research, once completed, will assess the strategic role of Enterprise Systems in enabling business transformations beyond operational benefits.

Atom probe tomography as a tool to advance steels design and performance

Development of modern steels consisting of complex or nano-scale microstructures with advanced properties requires in-depth understanding of the mechanisms responsible for their microstructure/property relationships. The evolution of microstructure during processing is often associated with various changes taking place at atomic level. These include solute distribution between phases as a result of phase transformations, formation of atmospheres at dislocations, clustering and precipitation phenomena due to various thermo-mechanical processing schedules and/or heat treatments. Atom probe tomography (APT) is invaluable tool for gaining insight into events at atomic scale determining the steel properties. This technique also contributes to the fundamental understanding of phase transformations, which is essential for nano-scale engineering of modern steels and optimization of their performance. In this work application of APT to study solute segregation, clustering and precipitation in TRIP steels and nanostructured bainitic steels after isothermal heat-treatment and after thermomechanical processing will be discussed.