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| EFFECT OF QUENCHED-IN VACANCIES ON MARTENSITIC TRANSFORMATION IN Fe-Ni ALLOYS |
| XU Zuyao (T. Y. Hsu); YAN Linfa (Shanghai Jiaotong University) (Manuscript received 27 February; 1983) |
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Cite this article:
XU Zuyao (T. Y. Hsu); YAN Linfa (Shanghai Jiaotong University) (Manuscript received 27 February; 1983). EFFECT OF QUENCHED-IN VACANCIES ON MARTENSITIC TRANSFORMATION IN Fe-Ni ALLOYS. Acta Metall Sin, 1984, 20(3): 143-150.
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Abstract Experimental results show that in some decarburized Fe-Ni alloys the M_s decreases and the strength increases with an increase in quenching temperature above 900℃ with a fixed parent phase grain size. After short time annealing of the quenched specimen, Ms increases and the strength decreases. A model of interaction of clustered point defect (vacancies)with partial dislocations is presented. It is suggested that the lowering of M_s is due to the pinning of the clustered vacancies to partial dislocations, hindering the nucleation of martensite. Preliminary TEM observation of substructure of austenite has comfired this view. From this experiment the energy of formation of vacancy is found to be 1.2-1.4 eV, in good agreement with the known values in Fe-Ni. The activation energy obtained in the annealing process is 0.18 eV, corresponding to the dissociation energy of bivacancies. The effect of quenching stress is also taken into consideration anti it is concluded that a moderate cooling rate of 2500℃/s seems just suitable for studying the effect of the quenched-in vacancies on M_s.
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Received: 18 March 1984
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1 徐祖耀,马氏体相变与马氏体,科学出版社,北京,1980,p.370-371．
2 Olson, G. B.; Cohen, M., Metall. Trans., 7A (1976) , 1897, 1905, 1915．
3 Brooks, J.W.; Lerotte, M.H.; Smallman, R.E., Acta Metall., 27 (1979) , 1829, 1839．
4 Schiffgens, J. O.; Ashton, D. H., J. Appl. Phys., 45 (1974) , 1023．
5 Ingle, K.W.;Crooker, A.G., Acta Metall., 26 (1978) , 1461．
6 Boyer, L.L.; Hardy, J.R., Philos. Mag., 26 (1972) , 225．
7 Emrick, R.M., J. Phys. F: Metal Phys., 8 (1978,) 1353．
8 徐祖耀;高明;张寿柏,上海交通大学科研报告,1965．
9 Kinsman, K. R.; Shyne, J. C., Acta Metall., 15 (1967) , 1527．
10 徐祖耀,马氏体相变与马氏体,科学出版社,北京,1980,p.56．
11 Remy, L.; Pineau, A.; Thomas, B., Mater. Sei, Eng., 36 (1978) , 47．
12 Saka, H.; Sueki, Y.; Imura, T., Philos. Mag., A37 (1978) , 273．
13 Schramn, R.S.; Reed, R.P., Metall. Trans., 7A (1976) , 359．
14 徐祖耀,金属学报,16(1980) ,420．
15 Johnson, R.A., Phys. Rev., 152 (1966) , 629．
16 Caplain, A.; Chambron, W., Acta Metall., 25 (1977) , 1001．
17 吴自良;王其闵,物理学报,14(1958) .356;中国科学,7(1958) ,1029．
18 Xu Zuyao (T.Y. Hsu, 徐祖耀), Thermodynamic of Martensitic Transformation FCC(γ)-BCC (a), Shanghai Jiao Tong University Treatise, Ⅰ, 1981, MS-003． 徐祖耀,金属学报,15(1979) ,329．
19 Smallman, R.E., Modern Physical Metallurgy, London, Butterworths, 3rd ed., 1970, p.375-376． |
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