The role of microplastic deformations in the formation of the frequency dependence of the fatigue strength of structural materials

Gur'ev, A. V.; Karpov, A. P.

doi:10.1007/bf01524063

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“…The stress at which the first signs of LDB occur is usually taken as the true elastic limit s e of the polycrystals, [14] which is much smaller than the macroscopic elastic limit s 0.2% with a traditional tolerance of residual strain " res ¼ 0:2% with a guaranteed entry into macroplastic flow. Actually, the material is in macroplastic state when the stress is over s 0.2% , [15] which adopts a residual strain " res ¼ 0:02% and is $300 MPa for the 22MnB5 steel. In the range from s e to s 0.02% , the material is dominated by the micro-plastic deformation mechanism and is also in a quasi-elastic stage.…”

Section: Micro-and Macro-plastic Deformationsmentioning

confidence: 99%

Yield Point Elongation and Localized Deformation Bands in 22MnB5 Steel at Room Temperature

Min

Lin

2013

steel research int.

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22MnB5 steel shows a yield point elongation (YPE) of ∼0.5% at room temperature. Uniaxial tensile tests of 22MnB5 steel specimens were performed in a quasi‐static strain rate range from 3.33 × 10−5 s−1 to 3.33 × 10−3 s−1 with the aid of digital image correlation (DIC) technique to investigate the deformation behavior of 22MnB5 steel in a small strain range from 0 to ∼0.02. The evolutions of full fields of strain and strain rate on the 22MnB5 steel specimens were obtained. Discontinuously propagating localized deformation bands (LDBs) were observed before, during and beyond YPE, which are known as Type B Portevin‐Le Chatelier (PLC) bands resulting in serrations on stress strain curves and they are not Luders bands unexpectedly. The peak strain rates in the LDBs before the YPE is relatively small, and during the YPE, the strain rate in the LDBs increases to ∼2 times of the applied nominal strain rate, which is explained by micro‐ and macro‐plastic deformation mechanism.

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Section: Micro-and Macro-plastic Deformationsmentioning

confidence: 99%