|
|
|
| MORPHOLOGY OF UPPER BAINITE IN A 55SiMnMo STEEL |
| Liu Zhengyi and Huang Zhengzong (South China Institute of Technology)and Lin Dingwen (Huaqiao University) |
|
Cite this article:
Liu Zhengyi and Huang Zhengzong (South China Institute of Technology)and Lin Dingwen (Huaqiao University). MORPHOLOGY OF UPPER BAINITE IN A 55SiMnMo STEEL. Acta Metall Sin, 1981, 17(2): 148-247.
|
|
|
Abstract The morphology of upper bainite in a 55SiMnMo steel under normalized condition as well as its transformation in tempering has been observed by optical microscopy, TEM, SEM and X-ray diffraction. After austenitising at 900℃ for 1/2h and A. C., the upper bainite resulted was composed of ferrite and 30—35% carbon enriched austenite platelet, however, no carbide appeared until tempering treatment. The tempering temperature for carbide precipitation was found to be 400℃, and the tempering products, so called "tempered bainite", consist of ferrite, carbide and 3—5% austenite. The rate of crack propagation da/dN of the steel increases with the increase of tempering temperature and reaches its maximum at about 400℃, accompanied with relevant change of fracture type from the quasicleavage to the cleavage.
|
|
Received: 18 February 1981
|
[1] 柯俊,1954年金属研究工作报告会会刊,第五册:金属物理及检验,p.81．
[2] Hehemann, R. E., Phase Transformation, ASM, Metals Park, Ohio, 1970, p. 397．
[3] Kunitake, T., Terasaki, F., Ohmori, Y. and Ohtani, H., Iron Steel, 45 (1972) , 647．
[4] 邦武立郎,热处理,12(1972) ,94．
[5] Biss, V. and Cryderman, R. L., Met. Trans., 2 (1971) , 2267．
[6] 北京钢铁研究院、新抚钢厂,新钢技术情报,1977,№ 1,p.1．
[7] Le Houillier, A., Begin, G. and Dube, A., Met. Trans., 2 (1971) , 2645．
[8] Taylor, A., X-Ray Metallography, Wiley, New York, 1961, p. 525．
[9] Parker, E. R., Met. Trans., 8A (1977) , 1025．q |
| No Suggested Reading articles found! |
|
|
Viewed |
|
|
|
Full text
|
|
|
|
|
Abstract
|
|
|
|
|
Cited |
|
|
|
|
| |
Shared |
|
|
|
|
| |
Discussed |
|
|
|
|
