Effect of Vanadium on the Heat Resistance of Casting High-Temperature Nickel Alloys

The article presents data on heat resistance high-temperature tests of powder materials based on copper-nickel have been carried out. The oxidation features of materials samples with various alloying elements have been studied. Compaction of copper-nickel alloys samples was done by spark plasma sintering (SPS). The dependence of the growth rate of the oxide film on the temperature of high-temperature oxidation was established, and the effect of alloying elements in the composition of the samples on their heat resistance was considered. Based on the study’s results the dependence of the oxide film growth rate on high-temperature oxidation and the influence of alloying elements in the composition of sintered copper-nickel alloys on their heat resistance are considered. It was determined that for all the considered samples compositions of copper-nickel alloys synthesized by spark plasma sintering, the temperature 1000 °C of 20-hour heating heat resistance test is not the limiting one, since the samples retain their integrity. It is shown that simultaneous alloying of copper-nickel alloys with aluminum and chromium provides the highest heat resistance. The scale growth rate for composition Cu – Ni – Cr – Al 1.49·10–3 g/cm3 is lower than the oxidation rate of pure nickel 3.78·10–3 g/cm3 at 1000 °C. These two samples demonstrate the lowest weight gain after testing at 1000 °С, for compositions Cu – Ni – Al, Cu – Ni – Cr – Si and 50 wt. % Cu – 50 wt. % Ni the oxidation rate increases by two orders of magnitude, for compositions Cu – Ni – Si and Ni — by three orders of magnitude.

Download Full-text

Розробка технології дисперсного модифікування жароміцних нікелевих сплавів для лопаток газотурбінних двигунів

Aerospace technic and technology ◽

10.32620/aktt.2021.3.06 ◽

2021 ◽

pp. 49-53

Author(s):

Наталія Євграфівна Калініна ◽

Олександр Васильович Калінін ◽

Тетяна Валеріївна Носова ◽

Стелла Ігорівна Мамчур ◽

Наталія Іванівна Цокур

Keyword(s):

Mechanical Properties ◽

High Temperature ◽

Heat Resistance ◽

Nickel Alloys ◽

Effective Means ◽

Primary Crystallization ◽

High Temperature Corrosion ◽

Rotor Blades ◽

Initial State ◽

Heat Resistant

The paper proposes means of improving the properties of nickel alloys for aircraft gas turbine engines by improving the existing alloys. The efficiency of an aircraft engine depends on the quality of the turbine rotor blades, which are made of heat-resistant alloys. According to the studies, the obtained results of pilot tests of a complex of mechanical properties, high-temperature corrosion of a multicomponent high-temperature nickel alloy ХН59МВТКЮЛ (Ni-Cr-W-Co-Al-Ti-Mo systems). The paper proposes the use of modifiers. An effective means of dispersing the structural components of alloys at the macro and micro levels is the modification of multicomponent alloys with dispersed and nano dispersed compositions. Based on titanium nitride powder, a technological regime for modifying nickel melt with dispersed compositions of plasma chemical synthesis has been developed. The modifier was used in tablet form. Investigated different dosages of the modifier: 0.1…0.03 % by weight. The proposed method allows, with minimal losses at the melting stage, to introduce the required amount of modifier. The temperature and time parameters of the modification are 16500С, the modifier action time is 5…7 minutes. Investigations of the complex mechanical properties and the peculiarities of the formation of the structure of the modified alloy have been carried out. According to the research results, significant refinement of the alloy grain was obtained in comparison with the initial state. The modification led to an increase in mechanical properties: strength by 10 %, impact strength by 35...40 %. Comparison of the nano-modified alloy with the obtained one made it possible to increase the corrosion resistance of the ХН59МВТКЮЛ alloy in an oxidizing environment. At a temperature of 1000 0С, the corrosion depth decreased by 15 %. An increase in resistance to high-temperature corrosion is associated with a more uniform distribution of excess phases in the structure of the modified alloy. The mechanism of action of refractory particles of a modifier in a nickel melt, which are the nuclei of primary crystallization, has been established. The results of the work are of practical value in the manufacture of rotor blades from high-quality heat-resistant nickel alloys with increased parameters of heat resistance and heat resistance.

Download Full-text

Influence of Thermo-Mechanical Processing on the Microstructure of Beryllia Dispersed Nickel Alloys

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100071363 ◽

1973 ◽

Vol 31 ◽

pp. 184-185

Author(s):

M.S. Grewal ◽

S.A. Sastri ◽

N.J. Grant

Keyword(s):

High Temperature ◽

Nickel Alloys ◽

Thermomechanical Processing ◽

Cold Work ◽

High Temperature Strength ◽

Strengthening Effect ◽

Mechanical Processing ◽

Uniform Dispersion ◽

Oxide Particles ◽

Nickel Base

Currently there is a great interest in developing nickel base alloys with fine and uniform dispersion of stable oxide particles, for high temperature applications. It is well known that the high temperature strength and stability of an oxide dispersed alloy can be greatly improved by appropriate thermomechanical processing, but the mechanism of this strengthening effect is not well understood. This investigation was undertaken to study the dislocation substructures formed in beryllia dispersed nickel alloys as a function of cold work both with and without intermediate anneals. Two alloys, one Ni-lv/oBeo and other Ni-4.5Mo-30Co-2v/oBeo were investigated. The influence of the substructures produced by Thermo-Mechanical Processing (TMP) on the high temperature creep properties of these alloys was also evaluated.

Download Full-text

DURANICKEL ALLOY 301

Alloy Digest ◽

10.31399/asm.ad.ni0083 ◽

1963 ◽

Vol 12 (6) ◽

Keyword(s):

Fracture Toughness ◽

Corrosion Resistance ◽

High Temperature ◽

Heat Resistance ◽

Physical Properties ◽

Surface Treatment ◽

High Strength ◽

Heat Treating ◽

International Nickel Company ◽

Temperature Performance

Abstract DURANICKEL Alloy 301 is a wrought, age-hardenable nickel alloy having high strength, high corrosion and heat resistance. It is recommended for springs, diaphrams, bearings, pump and valve parts. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties as well as fracture toughness and fatigue. It also includes information on high temperature performance and corrosion resistance as well as forming, heat treating, machining, joining, and surface treatment. Filing Code: Ni-83. Producer or source: The International Nickel Company Inc..

Download Full-text

CMN-155

Alloy Digest ◽

10.31399/asm.ad.ss0212 ◽

1968 ◽

Vol 17 (8) ◽

Keyword(s):

High Temperature ◽

Heat Resistance ◽

Physical Properties ◽

Gas Turbine ◽

Base Alloy ◽

Heat Treating ◽

Jet Engine ◽

Iron Base Alloy ◽

Temperature Performance ◽

High Oxidation

Abstract CMN-155 is an austenitic iron-base alloy having high oxidation and heat resistance combined with good high temperature properties. It is recommended for jet engine and gas turbine components, high temperature fasteners, and rocket chambers. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties as well as creep. It also includes information on high temperature performance as well as forming, heat treating, machining, and joining. Filing Code: SS-212. Producer or source: Cannon-Muskegon Corporation.

Download Full-text

A NEW WELDING MATERIAL FOR REGENERATION IN THE WELDING TECHNOLOGY BASED ON NICKEL. ANALYSIS OF THE COMPOSITION AND PROPERTIES OF DEFORMABLE HEAT-RESISTANT HIGH-CHROMIUM NICKEL-BASED ALLOYS FOR WELDED PARTS. ANALYSIS OF EXISTING FUELLING STATIONS TYPES AND VEHICLES USING HYDROGEN, HYDROGEN PRODUCTION AND STORING METHODS

10.36381/iamsti.1.2019.43-48 ◽

2019 ◽

pp. 43-48

Author(s):

Ben Nengjun ◽

Zhou Pengfei ◽

Oleksandr Labartkava ◽

Mykhailo Samokhin

Keyword(s):

Rare Earth ◽

High Temperature ◽

Nickel Alloys ◽

Total Content ◽

Operating Conditions ◽

High Temperature Strength ◽

High Chromium ◽

Salt Corrosion ◽

Tcp Phases ◽

The Impact

This work involves an analysis of high-chromium high-temperature deformable wieldable nickel alloys for use in GTE repair assemblies. It is shown that the alloys EP868 (VZh98) and Haynes 230 can be used in welded assemblies with an operating temperature of 800-1100 °C. The alloys Nimonic 81, Nimonic 91, IN 935, IN 939, and Nicrotan 2100 GT also have a high potential for use in welded assemblies. They are characterized by a combination of good weldability, high-temperature strength, and resistance to scaling. There have been conducted studies on high-temperature salt corrosion of model nickel alloys. They allowed establishing the patterns of the impact of base metal alloying with chromium, aluminum, titanium, cobalt, tungsten, molybdenum, niobium, tantalum and rare earth metals on the critical temperature of the start of salt corrosion Tcor and the alloy mass loss. It has been established that alloys with a moderate concentration (13-16%) of chromium can possess satisfactory hightemperature corrosion resistance (HTC resistance) under the operating conditions of ship GTE. The HTC resistance of CrAl-Ti alloys improves upon reaching the ratio Ti/Al ˃ 1. Meanwhile, the ratio Ti/Al ˂ 1 promotes the formation of corrosion products with low protective properties. The positive effect of tantalum on the HTC resistance of alloys is manifested at higher test temperatures than that of titanium, and the total content of molybdenum and tungsten in alloys is limited by the condition 8Mo2 – 2W2 = 89. The presence of refractory elements stabilizes the strengthening phase and prevents formation of the ɳ-phase. However, their excess promotes formation of the embrittling topologically close packed (TCP) phases and boundary carbides of an unfavorable morphology. Based on the studies of the HTC resistance, there has been identified a class of model high-temperature corrosionresistant nickel alloys with a moderate or high chromium content (30%), Ti/Al ˃ 1, and a balanced content of refractory and rare-earth elements.

Download Full-text