|
|
|
| THE MORPHOLOGY OF BAINITE IN A 30CrMnSi STEEL |
| Liu Wenxi; Zou Meiyun and Ma Fuben |
|
Cite this article:
Liu Wenxi; Zou Meiyun and Ma Fuben. THE MORPHOLOGY OF BAINITE IN A 30CrMnSi STEEL. Acta Metall Sin, 1981, 17(2): 137-245.
|
|
|
Abstract The bainite transformation in a 30CrMnSi steel was studied by thin foil transmission electron microscopy. It was found that: (1) The lower bainite of twin rail mode or of side precipitation mode and the upper bainite of branch mode are present in the steel. The midribs occur in the lower bainite plates and the step-like fronts in the upper ones. (2) The determination of orientations not only between the cementite and bainite-ferrite matrix but also between the matrix and austenite has been carried out as:(010)_θ∥(1(?))_B, (1(?))_B∥(011)_A,(103)_θ∥(101)_B, (101)_B∥((?))_A thus the bainite carbide precipitation from austenite may be proposed. (3) The formation of lower bainite seems to be analogous to the second stage of tempering, i. e. decomposition of retained austenite. During this stage, the correlation among four phases: austenite, e-carbide, cementite and bainite ferrite may be possibly expressed as a whole by the following parallelisms:((?)1)_A∥(000(?))_e∥(103)_θ∥(101)_B,(011)_A∥(1(?)10)_e∥(010)_θ∥(1(?))_B,((?)1(?))_A∥((?)010)_e∥((?)03)_θ∥(12(?))_B Specific close packed planes and directions are parallel in all these structures.
|
|
Received: 18 February 1981
|
[1] Hehemann, R. F., Kinsman, K. R. and Aaronson, H. I., Met. Trans., 3 (1972) , 1077．
[2] Srinivasan, G, R. and Wayman, C. M., Acta Met.,16 (1968) , 609．
[3] Shackleton, D. N, and Kelly, P. M, Iron Steel Inst, Spec. Rep,, 1965, № 93, p. 126; Acta Met.,15(1967) , 979．
[4] Ohmori, Y., Trans. Iron Steel Inst. Jap., 13 (1973) , 56．
[5] Huang, Der-Hung and Thomas, G., Met. Trans., 8A (1977) , 1661．
[6] Mehl, R. F., Hardenability of Alloy Steel, ASM, 1939, p. 270．
[7] #12
[8] Kelly, P. M. and Nutting, J., J. Iron Steel Inst., 197 (1961) , 199．
[9] Isaichev, I. V., Zh. Tekhn. Fiz., 17 (1947) , 835．
[10] AH CCCP, 73(1950) , 1161．
[11] Pitsch, W., Acta Met., 10 (1962) , 897．
[12] Pitsch, W,. Arch. Eisenhuettenwes., 34 (1963) , 381．
[13] Ko, T. (柯俊) and Cottrel, S. A., J. Iron Steel Inst., 172 (1952) , 307．
[14] 柯俊,金属研究工作报告会会刊,第五册,金属物理及检验,科学出版社,1954,p.81．
[15] Matas, S. J. and Hehemann, R. F., Trans. AIME, 221 (1961) , 179．
[16] #12
[17] Jack, K. H., J. Iron Steel Inst., 169 (1951) , 26．
[18] Murphy, S. and Whiteman, J. A., Met. Trans., 1(1970) , 843．
[19] Cohen, M., Trans. ASM, 41 (1949) , 35．
[20] Speich, G. R. and Leslie, W. C., Met. Trans., 3 (1972) , 1043．
[21] Kaufman, L., Radcliffe, S, V. and Cohen, M., Decomposition of Austenite by Diffusional Processes,Interscience, New York, 1962, p. 313．
[22] Habraken,L.,De Ferri Metallographia, I: Bases de la Metallographie, Presses Academiques Europeennes S. C., Bruxelles, 1966,Plate 175-7．
[23] Honeycombe, R. W. K. and Pickering, F. B., Met. Trans., 3 (1972) , 1099．
[24] Honeycombe, R. W. K., Met. Trans., 7A (1976) , 915．
[25] Nutting, J. and Baker, R. G.,The Microstructure of Metals,Monograph and Report Series № 30,Inst. Metals, London,1965, p. 211, Fig, 25-19．
[26] Habraken,L. J. and Economopoulos, M., Transformation and Hardenability in Steels,Climax Molybdenum Company, Ann Arbor, 1967, p. 69．
[27] #12
[28] Bojarski, Z. and Bold, T., Acta Met., 22 (1974) , 1223．
[29] Chilton, J. M. and Speich, G. R., Met. Trans,, 1 (1970) , 1019．
[30] 大森靖也,铁钢 65(1979) ,126．~ |
| No Suggested Reading articles found! |
|
|
Viewed |
|
|
|
Full text
|
|
|
|
|
Abstract
|
|
|
|
|
Cited |
|
|
|
|
| |
Shared |
|
|
|
|
| |
Discussed |
|
|
|
|
