Back stress strengthening and strain hardening in gradient structure

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

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Author(s)

Detail(s)

Original languageEnglish
Pages (from-to)145-151
Journal / PublicationMaterials Research Letters
Volume4
Issue number3
Online published2 Mar 2016
Publication statusPublished - 2016
Externally publishedYes

Link(s)

Abstract

We report significant back stress strengthening and strain hardening in gradient structured (GS) interstitial-free (IF) steel. Back stress is long-range stress caused by the pileup of geometrically necessary dislocations (GNDs). A simple equation and a procedure are developed to calculate back stress basing on its formation physics from the tensile unloading-reloading hysteresis loop. The gradient structure has mechanical incompatibility due to its grain size gradient. This induces strain gradient, which needs to be accommodated by GNDs. Back stress not only raises the yield strength but also significantly enhances strain hardening to increase the ductility.

Research Area(s)

  • Back stress, Ductility, Geometrically necessary dislocations, Gradient structure, Work hardening

Citation Format(s)

Back stress strengthening and strain hardening in gradient structure. / Yang, Muxin; Pan, Yue; Yuan, Fuping et al.
In: Materials Research Letters, Vol. 4, No. 3, 2016, p. 145-151.

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

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