Structure–phase characteristics and the mechanical properties of single-crystal nickel-based rhenium-containing superalloys with carbide–intermetallic hardening

详细信息    查看全文

• 作者：N. V. Petrushin ; E. M. Visik ; M. A. Gorbovets…
• 刊名：Russian Metallurgy (Metally)
• 出版年：2016
• 出版时间：July 2016
• 年：2016
• 卷：2016
• 期：7
• 页码：630-641
• 全文大小：1,426 KB
• 刊物主题：Metallic Materials;
• 出版者：Springer US
• ISSN：1555-6255
• 卷排序：2016

文摘

Single crystals of rhenium-containing ZhS32-VI, ZhS32U nickel superalloys with the 〈001〉, 〈011〉, and 〈111〉 crystallographic orientations have been produced by directional solidification. The alloying element segregations and the thermal stability of the microstructure consisting of a γ solid solution and hardened by precipitates of the γ′ phase and MC carbides are studied. The crystal lattice parameters of the γ′ and γ phases; the γ/γ′ misfit; and the liquidus, solidus, and γ′-solvus temperatures of the alloys have been found. The temperature dependence of the γ′-phase solubility has beeisn determined. The temperature–orientation dependences of the tensile strength characteristics in the range 20–1150°C and the low-cycle fatigue at 850°C of the alloy single crystals with the 〈001〉, 〈011〉, and 〈111〉 orientations are presented.