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| SHELL-SHAPED FRACTURE IN A MEDIUM CARBON STEEL DUE TO BORON EMBRITTLEMENT |
| Liu Fuyu Central Laboratory of Kunming Iron and Steel Company |
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Cite this article:
Liu Fuyu Central Laboratory of Kunming Iron and Steel Company. SHELL-SHAPED FRACTURE IN A MEDIUM CARBON STEEL DUE TO BORON EMBRITTLEMENT. Acta Metall Sin, 1979, 15(3): 373-460.
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Abstract The impact fracture of a medium carbon (0.5%C) steel containing boron(0.0005-0.0050% acid soluble boron) has been examined by SEM after various heat-treatments. It was found that shellshaped fracture occurred only if Fe_(23)(C,B)_6precipitated at austenite grain boundries was in large quantity and with particlesize greater than 2μm, the corresponding impact values of such specimens wereextremely low. Such specimens could not be remedied by the usual quench andtemper treatment, and re-solution treatment at high temperatures (980-1050℃)followed by rapid cooling to room temperature was necessary to modify the sizeand distribution of the boron-containing phase, with the consequence of improvingproperties and eliminating the shell-shaped fracture. Similar fractures were alsoobserved in a 40MnMoB steel.
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Received: 18 March 1979
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[1] Brown, A. et al., Metal Sci. J., 8 (1974) , 317．
[2] Ueno, M. and Inoue, J., Trans. Iron Steel Inst. Jap., 13 (1973) , 210．
[3] Brewer, L. and Chang, S. G., Metals Handbook, Vol. 8, ASM, 1973． p. 400． |
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