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Work Hardening. Dislocations interact with each other and assume configurations that restrict the movement of other dislocations. As the dislocation density increases there is an increase in the flow stress of the material. The dislocations can be either “strong" or “weak" obstacles to the movement of other dislocations,
Work hardening, also known as strain hardening is the strengthening of a metal or polymer by plastic deformation. This strengthening occurs because of dislocation movements and dislocation generation within the crystal structure of the material. Many non-brittle metals with a reasonably high melting point as well as
Possible Ways. Dislocation interaction with. 1) other dislocations --strain hardening. 2) grain boundaries-- grain boundary strengthening. 3) solute atoms -- solid solution strengthening. 4) precipitates -- precipitation hardening. 5) dispersoids -- dispersion strengthening
23 Aug 2001 2 that the stress needed to increase the strain beyond the proportional limit in a ductile material continues to rise beyond the proportional limit; the material requires an ever-increasing stress to continue straining, a mechanism termed strain hardening. These microstructural rearrangements associated with
In cold working the properties are enhanced due to strain hardening effect. * Large tonnage can be easily produced. The process can be easily mechanized. Limitations of Mechanical working process. The product becomes highly anisotropic in nature. *Final product has to be obtained after machining of the wrought
As n varies, the shape of the true stress-strain curve also alters (see figure). If n is low, the work- hardening rate is initially high but the rate decreases rapidly with strain. On the other hand, with a high n, the initial work hardening is less rapid but continues to high strains. n. K? ? =
6 Aug 2012 general decrease in size with further straining. Figure 8.6.2: uniaxial stress-strain curve for a strain-softening material. 8.6.2 Hardening Rules. A number of different hardening rules are discussed in this section. Isotropic Hardening. Isotropic hardening is where the yield surface remains the same shape but
where K – is strength coefficient, and n – is strain hardening exponent. The strain- hardening exponent may have values from n="0" (perfectly plastic solid) to n="1" (elastic solid). For most metals n has values between 0.10 and 0.50. The Power law equation described above is also known as Holloman-Ludwig equation.
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CHAPTER 7. Strain Hardening and Annealing. 7.1. Introduction. 7.2. 188. In this chapter we will discuss three main topics: cold working, by which a metal is simultaneously deformed and strengthened; hot working, by which a metal is deformed at high temperatures without strengthening; and annealing, during which.

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February 2018