scholarly journals Semisolid Metal Processing Techniques for Nondendritic Feedstock Production

2013 ◽  
Vol 2013 ◽  
pp. 1-16 ◽  
Author(s):  
M. N. Mohammed ◽  
M. Z. Omar ◽  
M. S. Salleh ◽  
K. S. Alhawari ◽  
P. Kapranos
Keyword(s):  
Metal Alloys ◽  
High Quality ◽  
Microstructural Alterations ◽  
Globular Microstructure ◽  
Industrial Sectors ◽  
Transition Area ◽  
Metal Processing ◽  
Feedstock Production ◽  
Processing Techniques ◽  
Semisolid Metal

Semisolid metal (SSM) processing or thixoforming is widely known as a technology that involves the formation of metal alloys between solidus and liquidus temperatures. For the procedure to operate successfully, the microstructure of the starting material must consist of solid near-globular grains surrounded by a liquid matrix and a wide solidus-to-liquidus transition area. Currently, this process is industrially successful, generating a variety of products with high quality parts in various industrial sectors. Throughout the years since its inception, a number of technologies to produce the appropriate globular microstructure have been developed and applied worldwide. The main aim of this paper is to classify the presently available SSM technologies and present a comprehensive review of the potential mechanisms that lead to microstructural alterations during the preparation of feedstock materials for SSM processing.

Towards Selective Volumetric Additive Manufacturing and Processing of Ceramics

2019 ◽  
Author(s):  
A. P. Iliopoulos ◽  
J. G. Michopoulos ◽  
J. C. Steuben ◽  
A. J. Birnbaum ◽  
B. D. Graber ◽  
...  
Keyword(s):  
Additive Manufacturing ◽  
Ceramic Powder ◽  
Ceramic Materials ◽  
High Quality ◽  
Analysis And Design ◽  
Spatially Resolved ◽  
Selective Approach ◽  
Scientists And Engineers ◽  
Processing Techniques ◽  
Am Processes

Abstract The development of advanced additive manufacturing (AM) and material processing techniques is currently a topic of great interest to broad communities of scientists and engineers. In particular, there is a need for AM processes capable of producing functional and high-quality components at a faster rate than is currently achievable. In response to this demand, the present work introduces the initial steps of a novel spatially-resolved and selective approach for processing volumetric regions of ceramic materials. The proposed method utilizes microwave radiation to heat material at desired locations within a domain filled with ceramic powder. Using this principle of operation, a number of methods for implementation of this process are proposed. As a first step, a multiphysics computational methodology and an associated model that allows for the analysis and design of relevant processing systems is introduced. Additionally, a number of simulations demonstrating the feasibility of the proposed methodology are presented. Based on these preliminary results, we conclude with a discussion of ongoing and future efforts to fully realize this technology.

Marine CSEM of the Scarborough gas field, Part 1: Experimental design and data uncertainty

Geophysics ◽  
2012 ◽  
Vol 77 (4) ◽  
pp. E281-E299 ◽  
Author(s):  
David Myer ◽  
Steven Constable ◽  
Kerry Key ◽  
Michael E. Glinsky ◽  
Guimin Liu
Keyword(s):  
Perturbation Analysis ◽  
Data Uncertainty ◽  
Quality Data ◽  
High Quality ◽  
Gas Field ◽  
Data Set ◽  
Resistive Layer ◽  
Mapping Tool ◽  
Marine Csem ◽  
Processing Techniques

We describe the planning, processing, and uncertainty analysis for a marine CSEM survey of the Scarborough gas field off the northwest coast of Australia, consisting of 20 transmitter tow lines and 144 deployments positioned along a dense 2D profile and a complex 3D grid. The purpose of this survey was to collect a high-quality data set over a known hydrocarbon prospect and use it to further the development of CSEM as a hydrocarbon mapping tool. Recent improvements in navigation and processing techniques yielded high-quality frequency domain data. Data pseudosections exhibit a significant anomaly that is laterally confined within the known reservoir location. Perturbation analysis of the uncertainties in the transmitter parameters yielded predicted uncertainties in amplitude and phase of just a few percent at close ranges. These uncertainties may, however, be underestimated. We introduce a method for more accurately deriving uncertainties using a line of receivers towed twice in opposite directions. Comparing the residuals for each line yields a Gaussian distribution directly related to the aggregate uncertainty of the transmitter parameters. Constraints on systematic error in the transmitter antenna dip and inline range can be calculated by perturbation analysis. Uncertainties are not equal in amplitude and phase, suggesting that inversion of these data would be better suited in these components rather than in real and imaginary components. One-dimensional inversion showed that the reservoir and a confounding resistive layer above it cannot be separately resolved even when the roughness constraint is modified to allow for jumps in resistivity and prejudices are provided, indicating that this level of detail is beyond the single-site CSEM data. Further, when range-dependent error bars are used, the resolution decreases at a shallower depth than when a fixed-error level is used.

scholarly journals New Processes and Machine Tools for Advanced Metal Alloys

Metals ◽  
2020 ◽  
Vol 10 (2) ◽  
pp. 225
Author(s):  
Luis Norberto López de Lacalle ◽  
Ainhoa Celaya
Keyword(s):  
Machine Tools ◽  
Metal Alloys ◽  
Advanced Materials ◽  
Industrial Sectors

Advanced materials are crucial for the development of many industrial sectors such as aerospace, automotive, energy, among others [...]

scholarly journals Trend and Development of Semisolid Metal Joining Processing

2015 ◽  
Vol 2015 ◽  
pp. 1-13 ◽  
Author(s):  
M. N. Mohammed ◽  
M. Z. Omar ◽  
Z. Sajuri ◽  
M. S. Salleh ◽  
K. S. Alhawari
Keyword(s):  
Feasibility Studies ◽  
Metal Alloys ◽  
Future Directions ◽  
Advantages And Disadvantages ◽  
Potential Benefits ◽  
Liquidus Temperatures ◽  
Semisolid Metal

The semisolid metal joining (SSMJ) process or thixojoining process has recently been developed based on the principles of SSM processing, which is a technology that involves the formation of metal alloys between solidus and liquidus temperatures. Thixojoining has many potential benefits, which has encouraged researchers to carry out feasibility studies on various materials that could be utilized in this process and which could transform the production of metal components. This paper reviews the findings in the literature to date in this evolving field, specifically, the experimental details, technology considerations for industrialization, and advantages and disadvantages of the various types of SSMJ methods that have been proposed. It also presents details of the range of materials that have been joined by using the SSMJ process. Furthermore, it highlights the huge potential of this process and future directions for further research.

Sign in / Sign up

Export Citation Format

Share Document