Saturation of titanium alloys from graphite in a nitrogen-oxygen-containing medium
- 28 Downloads
We study the kinetics of carbonitriding of VT1-0, OT4, and VT14 titanium alloys in the course of their saturation from graphite in nitrogen. We propose to use nitrogen with an admixture of oxygen, transporting gaseous carbon to the surface of the metal, as a gaseous medium. This intensifies phase formation and enables one to obtain the carbonitride phases at low saturation temperatures (below 850°C), which increases substantially the microhardness and decreases the roughness of the surface. The additional diffusion of oxygen favors an increase in the depth of the gas-saturated layer, and that of carbon leads to its hardening.
KeywordsOxygen Nitrogen Titanium Graphite Structural Material
Unable to display preview. Download preview PDF.
- 1.O. I. Yas’kiv, I. M. Pohrelyuk, V. M. Fedirko, and I. V. Dyuh, “Effect of saturation parameters on the interaction of titanium alloys with carbon-nitrogen-containing media,” Fiz.-Khim. Mekh. Mater., 40, No. 3, 81–87 (2004).Google Scholar
- 2.I. M. Pohrelyuk, I. V. Dyuh, V. M. Fedirko, and O. I. Yas’kiv, “A study of thermodiffusion carbonitride coatings on titanium alloys,” Fiz.-Khim. Mekh. Mater., 41, No. 4, 59–65 (2005).Google Scholar
- 3.V. M. Fedirko, S. V. Mynyk, I. M. Pohrelyuk, and O. I. Yas’kiv, “Effect of temperature on the phase composition of the surface layers of VT1-0 alloy in the course of its carburization from graphite in argon,” Fiz.-Khim. Mekh. Mater., 38, No. 1, 69–73 (2002).Google Scholar
- 4.S. V. Huryn, V. M. Fedirko, I. M. Pohrelyuk, and O. I. Yas’kiv, “Selection of a medium for the carbooxidation of titanium alloys,” Fiz.-Khim. Mekh. Mater., 39, No. 6, 66–70 (2003).Google Scholar
- 5.Yu. N. Vil’k, “On the character of changes in microhardness in the region of homogeneity of titanium carbonitride,” Poroshk. Metall., No. 6(186), 70–74 (1978).Google Scholar
- 6.N. D. Tomashov, T. V. Chukalovskaya, N. P. Chebotareva, and V. I. Kudryavtsev, “Specific features of the anodic behavior of titanium carbide,” Zashch. Met., 25, No. 6, 911–919 (1989).Google Scholar