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Introduction - hdbk1132990223
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Design Considerations - index
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Basic Considerations for Material Selection for Process Service


DOE-HDBK-1132-99
metallurgy (which is different from the chemistry), including metallurgical phases,
local composition variations, nonmetallic inclusions, etc., and
fabrication processes, such as heat treatment, machining, pickling, bending, and
welding.
Not all metals are susceptible to all the age-related mechanisms identified above. The
susceptibility depends on the particular alloy, metallurgy, processing parameters, and
environments involved. Therefore, an acceptable metallic selection process considers
the following:
all possible degradation and failure modes in addition to mechanical failures,
metallurgy and fabrication processes,
availability of adequate data support and service experience for the specific
application, and
Nonmetallic materials are susceptible to thermal, cyclic, chemical, mechanical, humidity,
and radiation age-related degradation. An acceptable nonmetallic material selection
process considers, at least the following:
thermal properties, including temperature stability;
chemical properties, stability/resistance to chemicals;
electrical properties;
physical properties, including water/moisture absorption, odor;
mechanical properties;
thermosetting or thermoplastic;
flammability rating; and
optical properties, transparent, translucent, or opaque.
II-55


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