金属学报  1983, Vol. 19 Issue (6): 51-56

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低碳马氏体形成时碳的扩散(续)

徐祖耀;李学敏

上海交通大学;上海交通大学

DIFFUSION OF CARBON DURING FORMATION OF LOW-CARBON MARTENSITE (Continued)

XU Zuyao (T. Y. Hsu); LI Xuemin (Shanghai Jiaotong University)

徐祖耀;李学敏. 低碳马氏体形成时碳的扩散(续)[J]. 金属学报, 1983, 19(6): 51-56.
, . DIFFUSION OF CARBON DURING FORMATION OF LOW-CARBON MARTENSITE (Continued)[J]. Acta Metall Sin, 1983, 19(6): 51-56.

摘要 参考文献 相关文章 Metrics 全文: PDF(358 KB)   摘要: 计算得到低碳马氏体形成时使残余奥氏体富碳所需扩散的时间约为7×10~(-3)—3×10~(-4)s。与条状马氏体形成的时间——10~(-3)—10~(-6)s比较,可见碳的扩散跟得上或稍落后于马氏体条的形成。残余奥氏体均匀富碳的时间落后于马氏体条的形成至少达1个数量级。这些表明低碳马氏体形成时可能存在碳的扩散,但后者不是马氏体相变的主要或必需过程。若低碳马氏体按上贝氏体形式长大,则计算所得其长大速率仅3×10~(-4)cm/s,比现有实验数据至少低2个数量级。本文工作再次证明低碳马氏体的形成机制和上贝氏体的不同。 Abstract：The time required for carbon diffusion to enrich the retained austenite is 7×10~(-3) —3×10~(-4) s as calculated. In comparison with the time of formation of a martensite lath——10~(-3)—10~(-6) s, the result of calculation implies that the diffusion of carbon can keep pace with or slightly lags behind the formation of lath martensite. The time required for equalizing the carbon concentration enriched in the retained austenite is at least one order of magnitude lower than that for the formation of lath martensite. These results show that there may exist the carbon diffusion in the course of formation of low-carbon martensite, however, the carbon diffusion is not a main or required process in the martensitie transformation. Supposing that the growth of low-carbon martensite is analogous to that of upper bainite, we obtain the growth rate is only 3×10~(-4)cm/s, at least two orders of magnitude lower than the available experimental data at present. The present work proves once more the formation mechanism of low-carbon martensite differs from that of upper hainite. 收稿日期: 1983-06-18      服务 把本文推荐给朋友 加入引用管理器 E-mail Alert RSS 作者相关文章 徐祖耀 李学敏 44.8K 链接本文: https://www.ams.org.cn/CN/      或      https://www.ams.org.cn/CN/Y1983/V19/I6/51 1 徐祖耀;李学敏,金属学报,19 (1983) ,A83． 2 Rao, B.V.; Thomas, G., Proc. Int. Cony. on Martensitic Transformations, 1979, Ed. Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, p.12． 3 Thomas, G,; Sarikaya, M., Proc. Int. Cony. on Solid-Solid Phase Transformations, 1981, Ed. Aaronson, H.I.; D.E.Laughlin; R.F.Sekerka; C.M.Wayman,1982, AIME, p. 999． 4 Crank, J., The Mathematics of Diffusion, Oxford University Press, London, 1956, p.45． 5 Wells, C. Mehl, R.F., Trans. AIME., 140 (1940) , 279． 6 Owen, W.S.; Schoen, F.J.; Srinivasan, G.R., Phase Transformation, ASM, 1970, p.157． 7 Cottrell, A.H., Dislocations and Plastic Flow in Crystals, Oxford Press, London, 1953, p.149． 8 Cottrell, A.H., ibid., p.134, 147-149． 9 Marder, J.M.; Marder, A.R., ASM Trans. Q., 62 (1969) , 1． 10 本间敏夫,電気制鋼,29 (1958) ,261． 11 Yeo, R.B.G., ASM Trans. Q., 57 (1964) , 48． 12 徐祖耀,马氏体相变与马氏体,科学出版社,1980,p.328．K No related articles found! Viewed Full text Abstract Cited   Shared      Discussed