Steel Authority of India

About: Steel Authority of India is a based out in . It is known for research contribution in the topics: Microstructure & Ultimate tensile strength. The organization has 797 authors who have published 661 publications receiving 9958 citations. The organization is also known as: SAIL.

Fatigue crack growth rate and fracture toughness of 25 wt% silicon carbide whisker reinforced alumina composite with residual porosity

Abstract: The main purpose of this study was to determine the fracture toughness and the fatigue crack growth rate behaviour of 25 wt% silicon carbide whisker reinforced alumina ceramic composite. The fracture toughness values determined using the indentation technique depended significantly on the crack length produced at the corners of the indentation which, in turn, depended on the load used for the indentation and anisotropy in orientation of whiskers in the matrix. However, the fracture toughness values determined using the precracked four-point bend specimens were in general higher than that obtained by the indentation technique and the value was 5.96 ± 0.15 M Pa m 1 2 . The fatigue crack growth behaviour in this material was similar to that in the case of metals. However, the exponent for the fatigue crack growth rate was 15.5, significantly higher than that usually observed in metals. The likely micromechanism of crack growth under monotonic and cyclic loading in this composite has been identified from fractography of fatigue failed samples.

Evolution of acicular ferritic microstructure in a titanium bearing HSLA steel

Abstract: An attempt has been made to design and develop acicular ferritic steels by adopting three-stage controlled rolling, with titanium alone as microadditive. Process parameters such as finish rolling temperature (FRT), amount of deformation during the last pass and also the cooling rate after finishing have been altered to obtain different microstructural effects. Optical as well as transmission electron microscopy studies indicated that acicular ferritic microstructure can be engendered by applying a minimum deformation of 25 % at the finishing pass followed by water quenching. Decreasing the FRT from 850 °C, for water quenched steels deformed 33 %, resulted in the refinement of polygonal ferrite, whereas the reverse is the case with the aspect ratio of acicular ferrite

Spheroidisation Treatment for Steels

Abstract: The materials used in components are now highly diversified with many applications historically reserved for steels now taken by plastics, composites, and ceramics. There are, of course, many applications for which steels are still the most suitable material. Presently, it is important that the type of steel chosen for a given application and the heat treatment given to it be critically examined to justify its use. This study highlights the selection of steels for spheroidisation treatments and their commercial uses.

A General Framework for Using Social and Traditional Media During Natural Disasters: QuOIMA and the Central European Floods of 2013

Abstract: Traditional media have a long history in covering natural disasters and crises In many instances, these media remain major providers of information about an event In recent years, however, information about natural disasters has increasingly been disseminated on a significant scale via Social Media platforms These media provide new, additional and complementary angles on events and, combined with traditional media, produce a more complete spectrum of coverage We present an approach, combining information from across the different kinds of media—traditional as well as social—and also across multiple languages, providing opportunities for first responders and decision makers to gain improved situational awareness and allowing for improved disaster relief, support, mitigation and resilience measures The approach is put into context by relating it to a long-term strategic model including horizon-scanning and risk-management activities and a 5-phase disaster model forming the basis for information gathering and dissemination activities To illustrate the research efforts the QuOIMA (Quelloffene Integrierte Multimedia Analyse) project, based on the pillars of cross-media, multimedia, and multilingual processing and representing major aspects of the general framework is presented QuOIMA focuses on the information gathering aspects from the point of view of a first responder and crisis manager or -communicator rather than the management of active (outgoing) communication Initial findings on data collected during the 2013 Central European floods are reported and discussed