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| IN SITU OBSERVATION OF THE FRACTURE FOR A SPHEROIDIZED LOW CARBON STEEL |
| by ZHANG Yizeng; DAI Shujuan; ZOU Hongcheng; MIAO Pifeng (Huazhong University of Science and Technology; Wuhan)(Manuscript received 23 January; 1986; revised manuscript 23 July; 1985) |
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Cite this article:
by ZHANG Yizeng; DAI Shujuan; ZOU Hongcheng; MIAO Pifeng (Huazhong University of Science and Technology; Wuhan)(Manuscript received 23 January; 1986; revised manuscript 23 July; 1985). IN SITU OBSERVATION OF THE FRACTURE FOR A SPHEROIDIZED LOW CARBON STEEL. Acta Metall Sin, 1987, 23(5): 403-407.
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Abstract In situ observations of the behavior of void formation and dislocations formed ahead of a crack in a spheroidized low carbon steel have been carried out during fracture tests with TEM. The results show that the fracture occurs through alternate processes of nucleation, growth and coalescence of voids during plastic deformation. Void coalescence generally associates with the necking of matrix metal between the voids. Most frequetly, the cracks are in a zigzag shape. The deformation on the two sides of a zigzag crack does not match microscopically with each other. Dislocations may emit from the crack tip when the crack is either propagating or blunting. The dislocation emission is the main cause of the crack blunting. The effect of dislocation distribution on the void formation has also been discussed.
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Received: 18 May 1987
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