LOW ENERGY DISLOCATION STRUCTURES DUE TO FATIGUE SOFTENING

Acta Metall Sin

1989, Vol. 25

Issue (3): 45-50 DOI:

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LOW ENERGY DISLOCATION STRUCTURES DUE TO FATIGUE SOFTENING

CHAI Huifen;WANG Liqin;C. LAIRD Xi'an Jiaotong University University of Pennsylvania; U. S. A

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CHAI Huifen;WANG Liqin;C. LAIRD Xi'an Jiaotong University University of Pennsylvania; U. S. A. LOW ENERGY DISLOCATION STRUCTURES DUE TO FATIGUE SOFTENING. Acta Metall Sin, 1989, 25(3): 45-50.

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Abstract The evolution of dislocation structures in 6% prestrained steel 1018during fatigue has been studied by TEM. The dislocations are quite movable, theloose cells quickly change to "checkboard" structures, in which the main cell wallslie about{100}. Then, the low energy dislocation structures-dipolar walls and laby-rinth structures are evolved. The characteristic of labyrinth and the orientation of di-polar walls are quite similar to f. c. c. crystal, it indicates the energy state of systemand the moving ability of dislocations are important factors affecting softening pro-cess, rather than the slip geometric characters of dislocations and details of disloca-tions. The decreasing in misorientation between adjoining cells and internal stressare discussed.

Key words: steel 1018 fatigue softening dislocation configuration

Received: 18 March 1989

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https://www.ams.org.cn/EN/ OR https://www.ams.org.cn/EN/Y1989/V25/I3/45

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