Additive manufacturing materials, selection

The choice of a turboexpander load may be influenced by the desire to optimize refrigeration. In other words, a dynamometer load may be chosen over a generator load due to speed considerations. Additionally, there are other constraints imposed on optimal design. Factors such as impeller peripheral velocity (tip speed), bearing design, axial load balance, material selection, and manufacturing methods (which have greatly improved in the recent decades) all have an influence. 

Using the several materials selected and the basic design possibilities, products should be designed to meet the criteria as far as deflection is concerned, and the cost of manufacture estimated. If the designer does not have this type experience it is best done with the assistance of the fabricator who will fabricate the product. In addition to the material cost and the production labor costs, the amortization costs of the tools are to be included. 

There is need for greater care in motor alignment, and attention to this problem will reduce even further the frequency of bearing failures. Additional attention could be given to flow meters, and while most appear satisfactory, both in terms of durability and accuracy, some are most difficult to service. Knowing the alien-to-many materials ambient in the vicinity of seawater RO plants, I wonder why manufacturers do not pay more attention to materials selection here. 

The annual cost of corrosion consists of direct costs and indirect costs. The direct costs related to corrosion consist of (i) costs of design, manufacturing, and construction (ii) material selection (iii) additional material such as increased wall thickness for corrosion allowance (iv) materials such as coatings, inhibitors, sealants, cathodic protection to prevent corrosion (v) application including cost of labor and equipment. 

Plastics materials databases offer solutions to the problan of sorting through the maze of material data sheets with the help of a personal computer. However, except for CAMPUS, all the currently available materials databases do not provide material selection by uniform standards. AU databases are programmed to allow the user to search for a material by properties, generic name, trade mark, applications, and manufacturer. The majority include a comparative format for a side-by-side comparison of material properties from the same or different suppliers. One of the versions also provides scanned manufacturer data sheets and additional material and marketing information. 

Materials selection decisions may also be influenced by the ease with which metal alloys may be formed or manufactured into useful components. Alloy properties are altered by fabrication processes, and, in addition, further property alterations may be induced by the employment of appropriate heat treatments. Therefore, in the latter sections of this chapter we consider the details of some of these treatments, including annealing procedures, the heat treating of steels, and precipitation hardening. 

In addition to flaw detection, the added value of AMI is found in its ability to inspect the materials in a non-destructive manner. This allows the possibili of further mechanical, theimal and electrical test to be performed. Because the technology produces an image or map of the sample, it offers immediate feedback to what is happening within the sample. This road map offers invaluable feedback in helping to monitor quali and/or optimize manufacturing processes, parameters and/or materials selection. With the ability to gain information at specific levels, AMI is a powerful non-destructive inspection tool for analyzing the nature of any defect within a sample. 

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