Features of Obtaining Ni-Cr-Fe Alloy Powders by Plasma Atomization

2021 ◽  
Vol 1040 ◽  
pp. 1-7
Author(s):  
S.B. Ermakov ◽  
S.A. Vologzhanina ◽  
Boris S. Ermakov
Keyword(s):  
Power Plants ◽  
Utilization Rate ◽  
Production Time ◽  
Inconel 718 Alloy ◽  
Particle Size Ratio ◽  
Heat Treated ◽  
Harmful Emissions ◽  
Mechanical Properties And Corrosion ◽  
Cr System ◽  
Wire Feed

New requirements put forward to the modern industry to reduce harmful emissions increase the utilization rate of metal, reduce the production time of equipment, the production of components and parts from hard-to-process materials aim to introduce new technological processes. A promising technology is additive growing, which allows one to minimize the production time of unique products, to use hard-to-process alloys, for example, based on the Ni-Fe-Cr system, in their manufacture. The study was carried out by the method of mathematical planning of the experiment with subsequent processing of the results on a supercomputer. The results of the influence of the current applied to the plasma torch and the flow rate of the plasma-forming gas are presented; wire feed rates during spraying in power plants per fraction and particle size ratio in the volume of the yield of suitable. The minimum allowable yield of the product is set at 30 % with the production of fractions in the range from 40 to 140 microns. The results obtained for the Inconel 718 alloy confirmed the possibility of obtaining Ni-Cr-Fe alloy powders. The mode proposed in the work allows obtaining commodity fractions at the level of 30-35% of the mass of the sprayed feedstock. Additional tests of the mechanical properties and corrosion resistance of samples made from the resulting powder showed satisfactory results, similar to the results of tests of samples made from heat-treated alloy forgings.

Embrittlement Behavior of Isothermally Heat-Treated T/P92 Steel at 350°C

2007 ◽  
Vol 345-346 ◽  
pp. 465-468 ◽  
Author(s):  
Ja Min Koo ◽  
Sung Yong Kim ◽  
Kee Sam Shin ◽  
Yeon Gil Jung ◽  
Sung Kang Hur
Keyword(s):  
Power Plants ◽  
Structural Integrity ◽  
Air Cooling ◽  
Boiler Tube ◽  
P92 Steel ◽  
Heat Treated

P92 steels as well as P91 are widely used as boiler tube materials of ultra super critical (USC) power plants these days. And thus embrittlement is very important for structural integrity of the USC plants. The embrittlement was observed when P92 (Modified 9Cr-1.8W-0.5Mo-V-Nb) steels were quenched to and held at the temperature of 320 to 350°C, which were the temperatures intermediate between Ms and Mf, and then air-cooled. Nearly same kind of the embrittlement had been observed with the T/P91 steels and a theory had been proposed to explain the mechanism of the embrittlement by us. From the theory, the embrittlement might be caused by the brittle martensite which is freshly formed during air-cooling. We tried to apply the theory for the embrittlement of the T/P92 steel. The behaviors of the embrittled T/P92 steel were explained well by the theory.

scholarly journals Strength Tests and Numerical Simulations of Loess Modified by Desulfurization Ash and Fly Ash

Materials ◽  
2022 ◽  
Vol 15 (2) ◽  
pp. 512
Author(s):  
Zhi Cheng ◽  
Xinrong Cheng ◽  
Yuchao Xie ◽  
Zhe Ma ◽  
Yuhao Liu
Keyword(s):  
Shear Strength ◽  
Fly Ash ◽  
Power Plants ◽  
Utilization Rate ◽  
Direct Shear ◽  
Test Results ◽  
Mass Ratio ◽  
Direct Shear Tests ◽  
Strength Tests ◽  
Actual Test

Desulfurization ash and fly ash are solid wastes discharged from boilers of power plants. Their utilization rate is low, especially desulfurization ash, most of which is stored. In order to realize their resource utilization, they are used to modify loess in this paper. Nine group compaction tests and 32 group direct shear tests are done in order to explore the influence law of desulfurization ash and fly ash on the strength of the loess. Meanwhile, FLAC3D software is used to numerically simulate the direct shear test, and the simulation results and the test results are compared and analyzed. The results show that, with the increase of desulfurization ash’s amount, the shear strength of the modified loess increases first and then decreases. The loess modified by the fly ash has the same law with that of the desulfurization ash. The best mass ratio of modified loess is 80:20. When the mass ratio is 80:20, the shear strength of loess modified by the desulfurization ash is 12.74% higher than that of the pure loess on average and the shear strength of loess modified by fly ash is 3.59% higher than that of the pure loess on average. The effect of the desulfurization ash on modifying the loess is better than that of the fly ash. When the mass ratio is 80:20, the shear strength of loess modified by the desulfurization ash is 9.15% higher than that of the fly ash on average. Comparing the results of the simulation calculation with the actual test results, the increase rate of the shear stress of the FLAC3D simulation is larger than that of the actual test, and the simulated shear strength is about 8.21% higher than the test shear strength.

Anodizing and its effects on mechanical properties and corrosion resistance of laser additive manufactured Ti-6Al-4V alloy

2020 ◽  
Vol 111 (8) ◽  
pp. 654-660
Author(s):  
Palanisamy Chandramohan ◽  
Raman Raghu ◽  
Balasubramanian Ravisankar
Keyword(s):  
Mechanical Properties ◽  
Corrosion Resistance ◽  
Additive Manufacturing ◽  
Ringer Solution ◽  
Optimum Combination ◽  
Acidic Environment ◽  
Direct Metal Laser Sintering ◽  
Horizontal Orientation ◽  
Heat Treated ◽  
Mechanical Properties And Corrosion

Abstract Ti-6Al-4V components were developed in different orientations (horizontal and vertical) using an additive manufacturing technique called direct metal laser sintering and heat treated under three different procedures. Anodizing (18- 22 V) the vertically built heat treated-2 specimen yields an optimum combination of mechanical properties and corrosion resistance tested in an acidic environment. The anodized (18- 22 V) heat treated-1 specimen built in horizontal orientation performed better in terms of combined mechanical properties and corrosion resistance tested in ringer solution.

Experimental investigation of process parameters for WEDM of Ti-6Al-4V/TiN composites

2015 ◽  
Vol 22 (6) ◽  
Author(s):  
Levent Urtekin
Keyword(s):  
Feed Rate ◽  
Physical Vapor Deposition ◽  
Cutting Speed ◽  
Cutting Parameters ◽  
Performance Tests ◽  
Electric Discharge Machining ◽  
Food Industries ◽  
Heat Treated ◽  
Wire Electric Discharge Machining ◽  
Wire Feed

AbstractTi-6Al-4V alloys are difficult-machine materials. These alloys are extensively used in medicine, chemical units, marine and food industries, and particularly in the aerospace industry. Machinability of Ti-6Al-4V in wire electric discharge machining (WEDM) has been empirically investigated. WEDM performance tests were conducted on TiN coated Ti-6Al-4V alloy with physical vapor deposition (PVD) method, which is harder and has higher wear resistance. The performance of machinability of Ti-6Al-4V and Ti-6Al-4V/TiN materials was analyzed. The most important performance characteristics of WEDM cutting are surface roughness, machining gap, and cutting speed. The tests were conducted under cutting parameters including varying pulse durations (300, 500, 700 μs), tension (50, 100 V) and wire feed rate (5, 8 m/min). Based on tension, pulse duration, and wire feed rate of heat-treated uncoated samples when compared to untreated samples and coated samples, feed rates were found to be at the highest value.

scholarly journals THE EFFECT OF MARINE POWER PLANTS EXHAUST GASES TEMPERATURE ON THE QUALITY OF THEIR CLEANING USING THE CATALYTIC NEUTRALIZATION METHOD

2020 ◽  
pp. 167-174
Author(s):  
Gennady V. Medvedev ◽  
Mikhail Y. Khramov
Keyword(s):  
Power Plants ◽  
Negative Impact ◽  
Catalytic Converter ◽  
Quantitative Composition ◽  
Exhaust Gases ◽  
Environmental Objects ◽  
Catalytic Material ◽  
Harmful Emissions ◽  
Degree Of Purification

The use of catalytic neutralization for the purification of harmful emissions from ship power plants can significantly reduce the negative impact of exhaust gases on all environmental objects. The attractiveness of the proposed method lies in the possibility of selecting the appropriate composition of the catalytic material depending on the required degree of purification.The functional properties of catalytic materials are largely determined by the qualitative and quantitative composition of the material used, as well as the conditions of its operation - the temperature regime.In order to determine the acceptable composition of the catalytic converter material, we made an analyses of materials of various compositions. The optimum degree of purification was achieved on materials containing valuable components (rhodium, iridium, palladium). However, the issue of reducing the treatment system cost is important. So, the possibility of replacing such metals with ore grindings (bastnesite, loparite) has been studied in the paper.

Fiber Laser Deposition of Nickel-Based Superalloys Using Filler Wire Feed

2015 ◽  
Author(s):  
Y. N. Zhang ◽  
X. Cao ◽  
P. Wanjara
Keyword(s):  
Fiber Laser ◽  
Continuous Wave ◽  
Deposition Process ◽  
Processing Parameters ◽  
Laser Deposition ◽  
Filler Wire ◽  
Fiber Laser Welding ◽  
Heat Treated ◽  
Direct Laser ◽  
Wire Feed

In this work, a continuous wave fiber laser welding system was used to deposit nickel-based superalloys Inconel 718 (IN 718) and Waspaloy using filler wire feed sources. The multi-bead and multi-layer deposits that were manufactured were characterized in terms of the macro- and microstructures, defects, and hardness in both the as-deposited and fully heat treated conditions. The tensile properties of the deposits in the heat treated condition were also determined and compared to the existing aerospace materials specifications. Using optimized laser processing parameters, high strength deposits could be manufactured, though minor weld metal liquation cracking for IN718 and strain-age cracking for Waspaloy were present, which compromised slightly the ductility as compared to wrought aerospace specifications for the two alloys. The successful development of the direct laser deposition process using wire feeding indicates the potential of employing the fiber laser technology to manufacture nickel-based superalloy aerospace components.

Study and Application of Two-Level Optimization of Coal Blending for Power Plant Based on On-Line Coal Identification

2011 ◽  
Author(s):  
Ji Xia ◽  
Peng Peng ◽  
Cheng Zhang ◽  
Tao Yang ◽  
Gang Chen
Keyword(s):  
Power Plant ◽  
Power Plants ◽  
Thermal Power ◽  
Time Lag ◽  
Utilization Rate ◽  
Coal Blending ◽  
Sensing Model ◽  
On Line ◽  
Blended Coals ◽  
The Heat Balance

In china, many thermal power plants have to burn blended coals forced by the complexity of coal type and market tension and transportation pressure of coal purchasing. As a engineering implementation method of coal blending, “different coals grinding in different mills and then mixed burning in the furnace” has many advantages such as low investment, easy to control milling system parameters and can be optimized online, etc, compared with traditional coal blending methods. But it is limited by the number of mills and cannot achieve high-precision ratio of blending. To remedy this shortcoming, a model of two-level optimization of coal blending for the thermal power plant with direct blowing pulverizing system was established in this paper. The tradional coal blending was regarded as first step of optimization. The secondary optimization was implemented by adjusting the outputs of different mills, then the blend was changed to accurate ratio. Furthermore, since the existence of coal bunker, it made a time lag from coal discharge to combustion, meanwhile, the real-time load was unpredictable and the coal utilization rate was inconsistent of each bunker. The three reasons make it uncertain of the current coal of bunker. To identify each coal in the mill(equivalent to bunker) correctly was the basis of achieving the second blending optimization. Therefore, a soft-sensing model of coal moisture based on the heat balance equation was used to take this work. At last, a intelligent coal blending system by the two-level optimization model was developed for a power plant and achieved good results.

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