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| ON THE THERMAL STABILITY OF Ti ALLOYS Ⅲ. The Criterion for Thermal Stability and Its Application |
| LI Dong; WAN Xiaojing (Institute of Metal Research; Academia Sinica; Shenyang)(Manuscript received 4 November; 1983; revised manuscript 29 February; 1984) |
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Cite this article:
LI Dong; WAN Xiaojing (Institute of Metal Research; Academia Sinica; Shenyang)(Manuscript received 4 November; 1983; revised manuscript 29 February; 1984). ON THE THERMAL STABILITY OF Ti ALLOYS Ⅲ. The Criterion for Thermal Stability and Its Application. Acta Metall Sin, 1984, 20(6): 391-397.
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Abstract The Ti_3X-phase is found to be an important factor influenced the thermal stability of Ti alloys. The tendency towards the precipitation and growth of Ti_3Xphase may be described as the value of electron concentration. A kinetics of the embrittlement process of the alloys, depending on the exposure temperature and time, has been confirmed. Taking three factors, including electron concentration, operating temperature and service time, into account, a permissible electron concentration, N_p, may be ascertained as criterion for the thermal stability of an alloy. The physical meaning of the criterion is definite. A proposal could be made that the criterion is available for the standard of quality control of the alloy production and in new alloy design. If the determination of the Al equivalent factors of various alloying elements was made by their contribution to electron concentration, the Rosenberg's empirical formula should be modified as follow: 1(％Al)+0.46(％Sn)+0.42(％Ga)+6.7(％0)≤8(wt-％)
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Received: 18 June 1984
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1 Shamblen, C. E., Metall. Trans., 2 (1971) , 277．
2 Mendiratta, M. G.; Chakrabarti, A. K.; Roberson, J. A., Metall. Trans., 5 (1974) , 1949．
3 李东;刘羽寅;万晚景,金属学报,20(1984) ,A375．
4 李东;刘羽寅;金属学报,20(1984) ,A384．
5 中国科学院金属研究所;冶金部沈阳有色金属加工厂;冶金部抚顺钢厂,未发表资料,1978．
6 中国科学院金属研究所;冶金部沈阳有色金属加工厂,冶金部抚顺钢厂;三机部六○六所,未发表资料,1980．
7 Shamblen, C. E.; Redden, T. K., Metall. Trans. 3 (1972) , 1299．
8 Rosenberg, H. W., The Science, Technology and Application of Titanium, Proc. of lst Int. Conf. on Titanium, Eds. Jaffee, R. L; Promisel, N. E., Pergamon, London, 1970, p. 851． |
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