The heating rate influence on the elastic modulus temperature dependence of a corrosion-resistant nickel alloy

The temperature dependence of the elastic modulus of nickel-chromium-molybdenum alloy C4 was investigated by the method of dynamic mechanical analysis. At all heating rates, an abnormal increase in the elastic modulus is observed upon heating in the temperature range of 200-300 °C. It is shown that an increase in the heating rate shifts the beginning of the observed effect to the region of higher temperatures. The temperature anomaly in the elastic modulus of the C4 alloy is explained from the standpoint of the formation of a short-range order in a solid solution. The thermodynamically equilibrium temperature of the "disorder - short-range order" transition in C4 alloy is determined to be 205 °C. © Published under licence by IOP Publishing Ltd

The Influence of Post Weld Heat Treatment on the Structure and Mechanical Properties

The influence of post weld heat treatment nickel alloy Hastelloy® G-35® on the structure and mechanical properties were investigated. Also preferred annealing temperature was found and the regime of heat treatment was chosen

INVESTIGATION OF SECOND PHASE PRECIPITATION IN C4 AND KH65MVU ALLOYS

Методами растровой электронной микроскопии и микрорентгеноспектрального анализа исследовано выделение вторых фаз в сплавах С4 и ХН65МВУ. На основе металлографических данных построены участки диаграмм выделения вторых фаз в этих сплавах.Using the methods of scanning electron microscopy and micro-X-ray spectral analysis, the second phase precipitation in C4 and XH65MVU alloys has been studied. On the basis of metallographic data, sections of the diagrams «time-temperature- precipitation» in these alloys were developed.Работа выполнена при поддержке гранта Президента Российской Федерации № МК-1032.2017.8

MODELLING OF THE STRUCTURE OF SUPERALLOYS BASED ON NICKEL-CHROMIUM-MOLYBDENUM SYSTEM

New type of nickel-based superalloy was proposed in terms of its application in contact with molten chloride salts. Thermocalc Software AB was used to simulate the phase content of new alloy in dependence on its chemical composition. It was shown that carbon content in the material should be maintain at minimal level. The influences of other elements presence in the γ-phase austenite matrix were analyzed

MODELLING OF THE STRUCTURE OF ANEW SUPERALLOY BASED ON NICKEL-CHROMIUM-MOLYBDENUM SYSTEM

New type of nickel-based superalloy was proposed in terms of its application in contact with molten chloride salts. Thermocalc Software AB was used to simulate the phase content of new alloy in dependence on its chemical composition. It was shown that carbon content in the material should be maintain at minimal level. The influences of other elements presence in the γ-phase austenite matrix were analyzed

STRUCTURE AND MECHANICAL PROPERTIES OF NICKEL-BASED SUPERALOYS HASTELLOY G-35 AND N06035

Исследована структура и состав сплавов Hastelloy G-35 от Haynes Inc. и аналог N06035 от Zhejiang Jiuli Hi-Tech Metals Co. Определены механические свойства сплавов в состоянии поставки. Построена диаграмма «температура – время – сенсибилизация» до 1000 ч.Nickel-based superaloys Hastelloy G-35 (Haynes Inc.) and N06035 (Zhejiang Jiuli Hi-Tech Metals Co) were studied. The mechanical properties of alloys are determined. The TTP- diagrams are constructed

EFFECT OF LONG-TERM AGING ON MECHANICAL PROPERTIES OF NICKEL BASE ALLOY VDM® ALLOY 59

The mechanical properties of nickel alloy VDM® Alloy 59 have been examined after long-term aging in the temperature range 500–600°C for 1000 h. The Portevin-Le Chatelier effect is observed during tensile tests at elevated temperatures

INTERGRANULAR CORROSION TESTING OF NICKEL ALLOY VDM ® ALLOY C-4

С помощью комплекса различных стандартных методов исследована коррозионная стойкость и склонность к межкристаллитной коррозии никелевого сплава VDM ® Alloy C-4. Для проведения испытаний готовили образцы в состоянии поставки, после провоцирующего отжига, после сенсибилизационного старения и последующей термической обработки. Для различных условий определены скорости коррозии.Corrosion resistance and susceptibility to intergranular attack of nickel-based alloy VDM ® Alloy C-4 were studied using a variety of standard techniques. The samples for tests were taken in as received conditions, after provocative heating, and after sensitization, and further heat treatment. The corrosion rates for different conditions were determined

INVESTIGATION OF NEW NICKEL-BASED ALLOY KHN62M TO RESISTABCE AGAINST INTERGRANULAR CORROSION

Susceptibility to intergranular attack of new nickel-based alloy KhN62M was studied using a variety of standard techniques. The samples for tests were taken in as-received conditions and after heating. The corrosion rates for different conditions were determined.Работа посвящена исследованию склонности нового сплава на никелевой основе ХН62М к межкристаллитной коррозии. Установлены скорости коррозии для сплава в состоянии поставки, после провоцирующего нагрева.Работа выполнена при поддержке гранта Президента Российской Федерации № МК‑1032.2017.8

HEAT TREATMENT OF VARIOUS GRADES OF CORROSION-RESISTANT ALLOY VDM®ALLOY C-4

The processes of heat treatment of sheets and tubes made from VDM® Alloy C-4 were investigated. The following regime of heat treatment was chosen – annealing at 1100 0C during 30 min with further rapid quenching in the air.It was also shown that the cooling rate should be higher than 4 0С/min to prevent sigma-phase formation along the grain boundaries