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Transformation Induced Plasticity "TRIP" Steel
(section)
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== Material Properties of TRIP Steels == [[File:TRIPSteel Stressstraingraph.JPG|thumb|Fig 6: Typical engineering stress-strain curve for TRIP steels]] A typical engineering stress-strain curve for TRIP steels is shown in Figure 6. As can be seen, TRIP steels have a large amount of work hardening. The high work hardening can be attributed to the TRIP effect, as well as the fact that TRIP steels are primarily composed of soft ferrite and hard bainite. This "dual phase" nature allows for local deformation of the ferrite phase while maintaining a high tensile strength. Indeed, their tensile strength{{W|tensile strength}} is typically twice the value of their yield strength{{W|yield strength}}.<ref name="[2]">U.S. Steel TRIP Steels (2009) Available: http://web.archive.org/web/20111007042208/http://xnet3.uss.com/auto/tech/grades/TRIP_main.htm</ref> This means that TRIP steels also exhibit very stable work hardening, where the onset of necking occurs at relatively high elongation values (over 25%). This makes TRIP steels ideal for forming operations such as stamping or bending. Forming operations are often limited by the loss of strength of the component due to wall thinning, or rupture because the material reached its forming limit. TRIP steels are ideal for such operations because they have a high formability limit and have stable yield point elongation which increases the structural integrity of formed components.
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