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| UPPER BAINITE AND LUMP-LIKE COMPOSITE STRUCTURE IN 55SiMnMo STEEL |
| LIU Zhengyi; LI Zuxin (South China Institute of Technology; Guangzhou); LIN Dingwen (Huaqiao University) |
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Cite this article:
LIU Zhengyi; LI Zuxin (South China Institute of Technology; Guangzhou); LIN Dingwen (Huaqiao University). UPPER BAINITE AND LUMP-LIKE COMPOSITE STRUCTURE IN 55SiMnMo STEEL. Acta Metall Sin, 1986, 22(1): 69-147.
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Abstract A study was made of the lump-like composite structure, which is observed to be composed of lower bainite, dislocation martensite and austenite, appearend on the bainite transformation under different austenizing temperatures and continuous cooling conditions in the 55SiMnMo steel. It may be controlled because its volume percentage increases with the increase of cooling rate and decreases with the decrease of austenizing temperature. The effect of it on the mechanical properties of the steel has also been examined. It may retard the propagation of fatigue crack, especially, more effectively with certain lower ΔK. It may also contribute the strength and toughness for the steel owing to its dislocation martensite and lower bainite.
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Received: 18 January 1986
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1 Biss, V.; Chyderman, B.L.; Metall. Trans., 2 (1971) , 1267．
2 刘正义;黄振宗;林鼎文,金属学报,17 (1981) ,148．
3 刘正义;林鼎文,新钢技术情报,(1975) ,№ 1,1．
4 刘正义;林鼎文;黄振宗,华南工学院学报,(1979) ,№ 2,1．n |
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