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| "BRIGHT BAND" DEFECT ON FRACTURE SURFACE IN Cr-Ni STRUCTURAL STEELS |
| LI Hengwu (Liaoning Provincial Centre of Physical Testing and Chemical Analysis; Shenyang); XU Yongbo (Institute of Metal Research; Academia Sinica; Shenyang) (Manuscript received 30 July; 1983; revised manuscript 28 November; 1983) |
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Cite this article:
LI Hengwu (Liaoning Provincial Centre of Physical Testing and Chemical Analysis; Shenyang); XU Yongbo (Institute of Metal Research; Academia Sinica; Shenyang) (Manuscript received 30 July; 1983; revised manuscript 28 November; 1983). "BRIGHT BAND" DEFECT ON FRACTURE SURFACE IN Cr-Ni STRUCTURAL STEELS. Acta Metall Sin, 1984, 20(4): 255-385.
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Abstract The investigations were conducted by TEM, SEM and IMP techniques on the problem of "bright band" defect found occasionally on the longitudinal macroscopic fracture surface in commercial Cr-Ni structural steels, e. g. 30CrMnSiNi, 40CrNiMo, 4SCrNi, etc. The influence of "bright band" on their mechanical properties has also been evaluated. Results showed that the "bright band" defect is the hydrogen damage which is caused by hydrogen interdendritic segregation during solidification of steel ingots. This defect may lower obviously the impact toughness, reduction of area as well as elongation of the steels. The mechanism of its formation and the prevention have been discussed.
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Received: 18 April 1984
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1 陈廉;徐永波;尹万全,金属学报,14(1978) ,253．
2 中国科学院金属研究所,断口及冶金产品质量评价,未发表资料,1978年. |
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