Rana R.,Indian Institute of Technology Kharagpur |
Rana R.,RWTH Aachen |
Rana R.,Corus Research |
Singh S.B.,Indian Institute of Technology Kharagpur |
And 2 more authors.
Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science | Year: 2010
Biaxial stretching behavior of a promising high-strength copper-alloyed interstitial-free (IF) steel has been investigated under various processing conditions using bulge tests. Hill theory and von Mises yield criterion have been used to analyze the results. It is revealed that copper-alloyed IF steel in continuous-annealed (CA) condition exhibits the highest equivalent strain at fracture and largest limiting dome height (LDH) among all the processing conditions. However, these values are lower in copper-alloyed interstitial steel than in traditional interstitial-free-high-strength (IF-HS) steels due to the presence of solute copper and copper precipitates in the former. © 2010 The Minerals, Metals & Materials Society and ASM International.
Wen S.W.,Corus Research |
Colegrove P.A.,Cranfield University |
Williams S.W.,Cranfield University |
Morgan S.A.,BAE Systems |
And 2 more authors.
Science and Technology of Welding and Joining | Year: 2010
Considerable residual stress and distortion can be produced by friction stir welding, impeding industrial implementation. Finite element analysis has been used to develop three innovative rolling methods that reduce residual stress and distortion in friction stir welds. Of the three methods, post-weld direct rolling where a single roller is applied to roll the top surface of the weld after the weld metal has cooled to room temperature proved the most effective. The residual stress predictions from the model compared favourably with residual stress measurements reported in an accompanying paper. Finally, the effectiveness of using post-weld direct rolling is illustrated with an industrial example of a large integrally stiffened panel, where the distortion was virtually eliminated. © 2010 Maney Publishing.
Thomas D.J.,University of Swansea |
Whittaker M.T.,University of Swansea |
Bright G.W.,Corus Research |
Gao Y.,University of Warwick
Journal of Materials Processing Technology | Year: 2011
The cut-edge characteristic properties of automotive structures formed during the mechanical blanking and laser-cutting processes significantly influence fatigue life performance. This factor is becoming increasingly important as S355MC and DP600 high strength steels (HSS) grades under investigation exhibit an increased sensitivity to fatigue cracks initiating from cut-edge regions. It was determined that by manipulating the critical cutting process parameters, clearance in terms of mechanical blanking, and by controlling the interrelationship between power and traverse cutting speed during the laser cutting process can result in optimised fatigue lives being achieved. Optimal fatigue lives were attained by minimising the cut-edge surface damage and by controlling the near edge microstructural deformations during each cutting process. It is the critical significance of fatigue which is the limiting factor towards being able to effectively downgauge steel grades used as automotive chassis and suspension components. This research is some of the first that considers the influence of mechanical and laser cut-edge surface quality and internal properties, which has then been partnered to the critical fatigue performance of HSS grades. © 2010 Elsevier B.V. All rights reserved.
Horn A.J.,Corus Research
COST ACTION C26: Urban Habitat Constructions under Catastrophic Events - Proceedings of the Final Conference | Year: 2010
When designing structures to resist extreme or unplanned events such as explosions, impacts or earthquakes, it is necessary to define both the 'demands' placed on the materials of construction and the 'resistance' available. Integrity is ensured when resistance exceeds the demand with a suitable margin of safety. This paper characterises the fracture resistance of a grade S355J0 steel section subject to a combination of high loading rates and high temperatures. Conventional J-Resistance (J-R) curve tests are used to characterize quasi-static fracture resistance over a wide range of temperatures and instrumented, pre-cracked Charpy tests are used to characterise fracture resistance at impact loading rates over the same temperature range (ambient to +550°C). The results show that tearing resistance increases with increasing loading rate at all temperatures studied. Tearing resistance generally decreases with increasing temperature, but this relationship is also dependent on loading rate. © 2010 Taylor & Francis Group, London.
Adema A.T.,Technical University of Delft |
Yang Y.,Technical University of Delft |
Boom R.,Technical University of Delft |
Boom R.,Corus Research
ISIJ International | Year: 2010
The cohesive zone, where the ore fed into the blast furnace softens and melts, is critical to the blast furnace performance and stability due to its influence on the gas and solid flow. Here we describe a project for the development of a process model to predict the cohesive zone properties and results of an important part of the work; the solid and gas flow models. The process model will be developed to describe a realistic solid burden flow and the formation of the cohesive zone, its shape, location, structure and permeability. This will be achieved using various simulation and computing tools: a combination of the Discrete Element Method (DEM) and Computational Fluid Dynamics (CFD), the coupled DEM-CFD approach, together with models for the thermodynamics and reaction kinetics. The key benefits of the coupled approach lie in the coupling of the continuous phase and the discrete particles, and the possibility of introducing thermodynamics and reaction kinetics into the system in a more realistic manner. DEM and coupled DEM-CFD simulations in several geometries are presented for reduced scale blast furnace investigation on the influence of non-spherical particles and gas flow on the solid flow. A large influence of the geometry shape and boundary conditions on the solid flow was also found. © 2010 ISIJ.