Structural Constituent

Structural Constituent


a constituent of the micro-structure of an alloy characterized by a homogeneous average chemical composition and a uniform distribution and shape of the grains forming the constituent of the alloy’s phases. A structural constituent manifests itself during a phase transformation, and the microstructure can be made up of one or more such constituents. Thus, in eutectoid steel there is only one structural constituent after annealing, namely, pearlite, while hypereutectoid steel has two—pearlite and secondary cementite.

A structural constituent can be formed by crystallites (grains) of one or several phases. Thus, martensite in hardened steel and ferrite in pure iron are structural constituents consisting of the grains of a single phase; pearlite in steel and ledeburite in white iron are structural constituents formed by crystallites of different phases. The grains of the same phase in an alloy may be found in different structural constituents; for example, cementite in hypereutectoid steel enters into pearlite and is also present as secondary cementite. The properties of an alloy depend not only on the relative quantity of its phases but also on the presence of specific structural constituents, that is, on the shape, degree of dispersion, and arrangement of the grains of various phases.


References in periodicals archive ?
However only little empirical evidence supporting the hypothesis has been provided, and more, especially from the postmodifier structural constituent in Nigerian English noun phrase is required (Gorlach 1998).
Given that postmodifier is potentially the heaviest structural constituent within the NP structure, then subject noun phrase (which, according to Chapter 4, is likely to be structured simpler), is likely to be structured without a postmodifier.
Following Gisborne (2003), Hudson-Ettle and Nilsson (2002), Schilk & Schaub (2016) and Chapter 4, it implies that a simplified noun phrase is one with fewer structural constituents.
The overall structure of a noun phrase, which can be generally described as a simple or a complex NP, has been found to be influenced by the syntactic weight/length of structural constituents or elements that make up the entire NP structure (Hawkins 1994, Bresnan et al.
Analysis of microstructures and hardness measurements see that trend appears fragile due to structural constituent's inhomogeneous hard place on deposition section by welding.
I also enjoyed Ermida's fine exposition, in the second chapter, of the humor potential of structural constituents of language: the sound, the word, the sentence, the meaning.
The elastic deformation part is following the Hook's Law, the thermal deformation part will summarized of the thermal expansions of the structural constituents. For the calculation of transformation into martensite during the rapid cooling we use the CCT or the Koistinen-Marburger approach (***, 2011).
The metallographic examination highlighted joining defects, the configuration of the joint, the nature of structural constituents, according to SR EN 4590-90.
Laser welding procedure, with high concentrated heat input, induces structural changes with rapid heating and cooling, favourable to the appearance of hard structural constituents, with the tendency of fragilization of the joint.
(2000) showed that shearing strength had high positive correlations with structural constituents such as NDF, ADF and lignin, but these relationships were lost when strength parameters were standardized for morphological characteristics which included width, linear density and area density of leaf.

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