scholarly journals Oxidizability characterization of slag system on the thermodynamic model of superalloy desulfurization

2020 ◽  
Vol 39 (1) ◽  
pp. 405-416
Author(s):  
Wanming Li ◽  
Yulei Sun ◽  
Shaopeng Wu ◽  
Ximin Zang
Keyword(s):  
Distribution Ratio ◽  
Thermodynamic Model ◽  
Inconel 718 ◽  
Slag System ◽  
Balance Model ◽  
Characterization Methods ◽  
Coexistence Theory ◽  
Decisive Influence ◽  
Inconel 718 Superalloy

AbstractThe oxidizability characterization method of slag system has a decisive influence on the accuracy of the desulfurization model. By carrying out the balance experiments of melting system composed of CaF2–CaO–Al2O3–SiO2–TiO2–MgO–FeO slag system and Inconel 718 superalloy, the influence of Al2O3 and FeO on desulfurization distribution ratio at 1,773 K was studied. Based on the ion and molecule coexistence theory in slag, the effects of three oxidizability characterization methods, [Fe]–[O] balance, [Al]–[O] balance, and [Fe]–[Al]–[O] balance, on the accuracy of desulfurization thermodynamic model were studied. The results show that the effect of FeO on desulfurization distribution ratio is more significant than that of Al2O3 when the FeO content in slag is greater than 0.014%. When the FeO content in the slag is less than 0.014%, the effect of Al2O3 on the slag oxidizability will be greater than that of FeO. The calculated value of [Fe]–[Al]–[O] balance model is closer to the experimental-measured value compared to [Fe]–[O] balance model and [Al]–[O] balance model alone at 1,923 K.

Calculation Model of Mass Action Concentrations for CaO-MnO-FeO-SiO2-MgO-Al2O3 Slags Based on the Ion and Molecule Coexistence Theory

2012 ◽  
Vol 476-478 ◽  
pp. 134-138
Author(s):  
Xiao Hong Yang ◽  
Xiao Chun Ma ◽  
Cheng Chuan Wu ◽  
Guo Guang Cheng
Keyword(s):  
Phase Diagrams ◽  
Thermodynamic Model ◽  
Slag System ◽  
Calculation Model ◽  
Mass Action ◽  
Structural Units ◽  
Coexistence Theory ◽  
Slag Structure ◽  
Calculation Results ◽  
Good Agreement

According to the ion and molecule coexistence theory (IMCT) of slag structure and corresponding phase diagrams, a thermodynamic model for calculating mass action concentrations of structural units or ion couples of CaO-MnO-FeO-SiO2-MgO-Al2O3 slags was established. Equilibrium mass action concentrations of each structure unit were gained. And the calculation results of NFeO and NMnO were compared with measured aFeO and aMnO. The comparison shows that the calculated values of NFeO and NMnO are in good agreement with the reported measured values of aFeO and aMnO, so this calculating model could fairly describe the characteristics of the slag system.

scholarly journals Characterization of Strain-Induced Precipitation in Inconel 718 Superalloy

2016 ◽  
Vol 25 (8) ◽  
pp. 3409-3417 ◽  
Author(s):  
Jessica Calvo ◽  
Mariluz Penalva ◽  
José María Cabrera
Keyword(s):  
Inconel 718 ◽  
Inconel 718 Superalloy

Characterization of Precipitation Kinetics of Inconel 718 Superalloy by the Stress Relaxation Technique

2012 ◽  
Vol 706-709 ◽  
pp. 2393-2399 ◽  
Author(s):  
Jessica Calvo ◽  
She Yu Shu ◽  
Jose María Cabrera
Keyword(s):  
Mechanical Properties ◽  
Stress Relaxation ◽  
Inconel 718 ◽  
Relaxation Times ◽  
Precipitation Kinetics ◽  
Nickel Chromium ◽  
Phase Intermetallic ◽  
Δ Phase ◽  
Inconel 718 Superalloy

Inconel 718 is a nickel-chromium-iron superalloy which presents excellent mechanical properties at high temperatures, as well as good corrosion resistance and weldability. These characteristics can be optimized with an appropriate control of microstructural features such as grain size and precipitation. Precipitates of different nature can form in these alloys, i.e. γ’’ (a metastable metallic compound Ni3Nb), γ’ (Ni3(Ti, Al), carbides and/or δ phase (intermetallic Ni3Nb). Aging treatments are usually designed to obtain the precipitation required in order to optimize mechanical properties. However, precipitation can also appear induced by deformation and therefore interfere with hot forming operations, such as forging. Under these conditions, precipitation may lead to an increase of the loads required to carry out the process. The aim of the work was the characterization of precipitation kinetics for Inconel 718. With this purpose, stress relaxation tests were carried out at temperatures ranging from 950°C to 800°C. Moreover, different amounts of deformation were applied to the samples, prior to stress relaxation, to evaluate the effect of this variable on inducing precipitation. Some samples were quenched at different relaxation times for metallographic evaluation. The results obtained through mechanical testing, together with a proper characterization of precipitation by Scanning Electron Microscopy, were the basis for obtaining precipitation-time-temperature (PTT) diagrams after different deformation conditions.

Thermodynamic Model of Calculation of Sulfur Distribution Ratio between B2O3-Containing Slag and Molten Steel

2014 ◽  
Vol 633-634 ◽  
pp. 188-191
Author(s):  
Xiang Zhu ◽  
Yang Li ◽  
Xiao Jian Fan ◽  
Hong Ming Wang ◽  
Gui Rong Li
Keyword(s):  
Molten Steel ◽  
Distribution Ratio ◽  
Thermodynamic Model ◽  
Slag Basicity ◽  
Sulfur Distribution ◽  
Coexistence Theory ◽  
Sulfur Distribution Ratio

A thermodynamic model of calculation of sulfur distribution ratio between B2O3-containing slag and molten steel has been developed on the basis of the ion and molecule coexistence theory. Based on the model, the effects of B2O3 content and slag basicity on the sulfur distribution ratio in 1873K were investigated respectively. The results indicate that the sulfur distribution ratio decreased with increasing the content of B2O3, and when the content of B2O3 exceeds 6%, the sulfur distribution ratio was lower than 2.0. Therefore, in order to ensure the desulphurization ability of slag, the content of B2O3 should be controlled at about 6%. Moreover the sulfur distribution ratio can be increased by increasing the slag basicity.

Nanomechanical Characterization of Laser Peened Additively Manufactured Inconel 718 Superalloy

2019 ◽  
Vol 21 (9) ◽  
pp. 1900499 ◽  
Author(s):  
Tyler Palma ◽  
Michael Munther ◽  
Montu Sharma ◽  
Lloyd Hackel ◽  
Ali Beheshti ◽  
...  
Keyword(s):  
Inconel 718 ◽  
Inconel 718 Superalloy

scholarly journals Characterization of precipitation in gradient Inconel 718 superalloy

2021 ◽  
Vol 804 ◽  
pp. 140718
Author(s):  
Jie Ding ◽  
S. Xue ◽  
Z. Shang ◽  
Jin Li ◽  
Y. Zhang ◽  
...  
Keyword(s):  
Inconel 718 ◽  
Inconel 718 Superalloy

scholarly journals Study of ultrasonic vibration–assisted thread turning of Inconel 718 superalloy

2019 ◽  
Vol 11 (10) ◽  
pp. 168781401988377
Author(s):  
Yu He ◽  
Zhongming Zhou ◽  
Ping Zou ◽  
Xiaogang Gao ◽  
Kornel F Ehmann
Keyword(s):  
Surface Quality ◽  
Ultrasonic Vibration ◽  
Inconel 718 ◽  
Gas Turbines ◽  
Tool Path ◽  
Machining Parameters ◽  
Thread Cutting ◽  
Workpiece Surface ◽  
Inconel 718 Superalloy ◽  
The Relationship

With excellent properties, high-temperature superalloys have become the main application materials for aircraft engines, gas turbines, and many other devices. However, superalloys are typically difficult to machine, especially for the thread cutting. In this article, an ultrasonic vibration–assisted turning system is proposed for thread cutting operations in superalloys. A theoretical analysis of ultrasonic vibration–assisted thread cutting is carried out. An ultrasonic vibration–assisted system was integrated into a standard lathe to demonstrate thread turning in Inconel 718 superalloy. The influence of ultrasonic vibration–assisted machining on workpiece surface quality, chip shape, and tool wear was analyzed. The relationship between machining parameters and ultrasonic vibration–assisted processing performance was also explored. By analyzing the motion relationship between tool path and workpiece surface, the reasons for improved workpiece surface quality by ultrasonic vibration–assisted machining were explained.

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