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| A MECHANISM OF FLAKE FORMATION IN STEELS |
| LIU Minzhi; CHEN Lian (Institute of Metal Research; Academia Sinica; Shenyang); LIU Shengyan (Wuhan University) |
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Cite this article:
LIU Minzhi; CHEN Lian (Institute of Metal Research; Academia Sinica; Shenyang); LIU Shengyan (Wuhan University). A MECHANISM OF FLAKE FORMATION IN STEELS. Acta Metall Sin, 1983, 19(2): 35-152.
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Abstract The process of flake formation in steel was investigated by means of SEM, TEM EPMA and AES as well as acoustic emission technique. The results show whatever size of a flake may be, an "unwelded" smooth micropore was observed on its surface. The comparative experiment was made on the fracture surface of the dehydrogenated specimen, the "unwelded" micropores of identical type were also observed. It may be ascertained that the micropores are interdendritic voids and/ or hydrogen bubbles remaining in the solidified steel ingot, and not internal crack after hot-rolling. These voids and bubbles are unable to weld closely by hotrolling and form the nuclei of flakes in steel. These flakes grow gradually up during air cooling. Their growth will be continued and sometimes stopped till 20—30 days. The acoustic emission detected only signals for flakes growing, no one for sudden cracking, i. e. no incubation time for nucleation occurred. Three principal features of the micromorphology of flake fracture are trasgranular quasicleavage, intergranular wave-like stripes and elongated smooth "unwelded" micropores. The abovementioned mechanism of the flake formation may also illustrate the process of "bright-flakes" formation in Al alloy forgings.
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Received: 18 February 1983
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7 曾祥华等,未发表资料. |
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