|
|
|
| THE DECOMPOSITION OF δ-FERRITE IN A 18/8 STAINLESS STEEL CONTAINING 0.34% Ti AND 0.24% Mo |
| CHUANG YU-CHIH;LI YOU-KO;CHANG YENG-LIN Institute of Metal Research; Academia Sinica |
|
Cite this article:
CHUANG YU-CHIH;LI YOU-KO;CHANG YENG-LIN Institute of Metal Research; Academia Sinica. THE DECOMPOSITION OF δ-FERRITE IN A 18/8 STAINLESS STEEL CONTAINING 0.34% Ti AND 0.24% Mo. Acta Metall Sin, 1957, 2(4): 377-385.
|
|
|
Abstract The decomposition of δ-ferrite between 550°—900℃ in quenched 18/8 stainlesssteel specimens containing 0.34% Ti and 0.24% Mo has been studied microsco-pically. The mechanism of decomposition of δ-ferrite was found to be dependenton the reheating temperature. No sigma phase was found on prolonged heating inthe temperature range studied. Above 750℃, accicular austenite forms first, followedby general precipitation of TiC in the untransformed ferrite. Below 650℃, the se-quence of precipitation in ferrite is reversed, carbide precipitation precedes the for-mation of austenite. Between 650°—750℃, δ-ferrite decomposes into carbide andaustenite in an eutectoid manner. The eutectoid decomposition does not carry to itscompletion; part of the remaining ferrite then transforms into austenite which soonalso stops on account of the enrichment of δ-forming elements in the remainingferrite. Upheaved martensite plates were found in the electrolytically polished surface ofspecimens containing undissolved carbide and also in specimens in which the decompo-sition of ferrite has started when prepared in the same way. However, when allcarbide is dissolved, no martensite is found in the surface of the specimens whetherit is prepared electrolytically or mechanically. It is believed that the formation ofmartensite in this particular steel is a surface effect associated with electrolytic poli-shing, but its formation is also closely related to the carbon content of the auste-nitic matrix.
|
|
Received: 18 April 1957
|
[1] Franks, R., Binder, W. O. and Bishop, C. R., Trans. Amer. Soc. Metals, 29 (1941) , 33．
[2] Kirkby, H. W. and Morley, J. I., J. Iron & Steel Inst., 148 (1948) , 289．
[3] Smith, L. and Bowen, K. W. J., J. Iron & Steel Inst., 148 (1948) , 295．
[4] Gilman, J. J., Koh, P. K. (郭本坚) and Zmeskal, O., Trans. Amer. Soc. Metals, 41 (1949) , 1371．
[5] Bindari, A. E., Koh, P. K. (郭本坚) and Zmeskal, O., Trane. Amer. Soc. Metals, 43 (1951) , 226．
[6] Hoar, T. P. and Bowen, K. W. J., Trans. Amer. Soc. Med, 45 (1953) , 443．
[7] Shirley, H. T., J. Iron & Steel Inst., 174 (1953) , 242．
[8] Пивник, Е. М., 25 (1955) , 185．
[9] Kuo, K. (郭可信), J. Iron & Steel Inst., 181 (1955) , 213．
[10] 庄育智、刘嘉乐,金属学报,1卷4期(1956) .
[11] Howard, R. T. & Cohen, M., Trans. A. I. M. E., 172 (1947) , 413．
[12] Smith, C. S., Trans. A. I. M. E., 175 (1948) , 15．
[13] Simpkinson, T. V., Trans. Amer. Soc. Metals, 49 (1957) , preprint No. 29．
[14] Krivosok, V. I., Grossman, M, A., Trans. Amer. Soc. Steel Treating, 18 (1930) , 760．
[15] Avery, H. S., Wilke, C. R. and Fellows, J. A.,Trans. Amer. Soc. Metals, 44 (1952) , 57．
[16] Morley, J. I., Symposium on High Temp. Steels & Alloys for Gas Turbines (London, 1951) , 195．
[17] Jackson, J. H., Sympositun on the Nature, Occurrence & Effects of σ-phase (Philadelphia, 1951) , 110．
[18] Nehrenberg, A. E. & Lilly, P., Trans. Amer. Soc. Meals, 46 (1954) , 1176．
[19] Kuo. K. (郭可信), J. Iron & Steel Inst., 176 (1954) , 433．
[20] Kuo, K. (郭可信), J. Iron & Steel Inst., 181 (1955) , 128．
[21] Braumann, F. und Krater, H. Arch. Eisenhuttenwesen, 25 (1954) , 479．
[22] 庄育智、刘嘉乐、张庆春,金属学报,2卷1期(1957) .
[23] Cina, B., J. Iron & Steel Inst., 171 (1953) , 229．
[24] Hoar, T. P. & Bowen, K. W. J., Trans. Amer. Soc. Metals, 45 (1953) , 443．
[25] Eichelman, G. H. & Hull, H. C., Trans. Amer. Soc. Metals, 45 (1953) , 77．
[26] Hultgren, A., Trans. Amer. Soc. Metals, 39 (1947) , 915． |
| No Suggested Reading articles found! |
|
|
Viewed |
|
|
|
Full text
|
|
|
|
|
Abstract
|
|
|
|
|
Cited |
|
|
|
|
| |
Shared |
|
|
|
|
| |
Discussed |
|
|
|
|
