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Improvement of Surface Properties of Ti-6A1-4V Alloy by Low Pressure Carburizing  

Kim, J.H. (Div. of Plasma Technology R&D, KITECH)
Park, J.D. (Div. of Plasma Technology R&D, KITECH)
Kim, S.W. (Div. of Plasma Technology R&D, KITECH)
Publication Information
Journal of the Korean Society for Heat Treatment / v.16, no.4, 2003 , pp. 191-196 More about this Journal
Abstract
For improvement of the wear performance of Ti alloy, vacuum-carburizing technique was tried for the first time using propane atmosphere. During the low pressure carburizing carbide was formed at the surface and carbon transfer was occurred from the carbide to the matrix. It was found that: (i) surface hardness increased with the reduction of operating pressure and time; (ii) optimum hardness distribution could be obtained with the proper choice of temperature and carbon flux control; and, (iii) case depth was largely influenced not by time but by temperature. The two steps process was recommended for obtaining thick case depth and high surface hardness of Ti alloy. For the low oxygen partial pressure, it was necessary to introduce additional CO gas to the atmosphere.Grain boundary oxidation and non-uniformity could be prevented.
Keywords
Wear; Ti-6Al-4V alloy; Low pressure carburizing; Propane atmosphere; Hardness; TiC layer thickness;
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  • Reference
1 William F. Smith, Structure and properties of Engineering allouys (Second edition), McGRAW-HILL, (1993) 437
2 Z.S. Okamoto and M.S. Yakushiji, The Japan Society for Heat Treatment, 40(2) (2000) 88
3 A. Takamura, Trans. Inst. of Metal. 3, (1962) 10
4 Zenshiro Okamoto, Hiroshi Hoshika and Masao Yakushiji, 熱處理 40卷 4號, 平成12年, p.174-179
5 Kim S.W., Kim S.K., Son M.J., '96 Carburizing heat-treatment technology seminar, (1996) 89-118, 20-23
6 David R. Gaskell, Introduction to Metallugical Thermodynamics(second edition), McGRAW-HILL, (1981), p.287
7 J.L. Muray, Binary alloy phase diagram, Vol.1, W. Scott, Jr. (APIC), (1990) 889
8 C. Hayaud P. Jacquot, G. Barvian and G. Sultan, Caract risation par spectrom trie masse de I'atmosphre de traitement d'un four de c mentation basse pression, Association Technique de Traitement Thermique, (1997) 99-103