scholarly journals Nitriding during powder production and study of the structure of EP741NP alloy doped with nitrogen

2021 ◽  
Vol 64 (1) ◽  
pp. 59-67
Author(s):  
V. D. Katolikov ◽  
I. A. Logachev ◽  
O. A. Komolova ◽  
M. V. Zheleznyi ◽  
A. E. Semin
Keyword(s):  
Chemical Composition ◽  
Hot Isostatic Pressing ◽  
Wave Dispersion ◽  
Significant Loss ◽  
Sharp Change ◽  
Metal Powders ◽  
Powder Metal ◽  
Alloying With Nitrogen ◽  
Powder Production ◽  
Physical And Mechanical Characteristics

The development of modern technics is limited by the physical and mechanical characteristics of the produced alloys, properties of which are often determined and enhanced by introduced alloying components. One of the alloying elements that have been very actively introduced in recent years is nitrogen. As a rule, alloying with nitrogen is carried out by ferroalloys, less often by gaseous nitrogen, which has significant advantages. In the processes of special electrometallurgy, alloying with nitrogen can be performed using, for example, nitrogen-containing plasma. Such a method may be feasible in the production of powder metal by spraying the ingot with nitrogen-containing plasma. It is known that performance properties of the products made of powder metal are significantly higher than those of cast metal. This served as a stimulus for investigating the properties of a product obtained from nitrided powder alloy EP741NP. In this work, a study of changes in the chemical composition, microstructure and microhardness of EP741NP alloy samples was carried out. The studied material was nitrided metal powders made on a plasma centrifugal spraying (PREP) unit and ingots from granules obtained by hot isostatic pressing (HIP). The chemical composition of the obtained samples was determined by wave dispersion X-ray fluorescence spectrometry. In order to study the microstructure of metal powders and ingots, the methods of scanning electron microscopy with EDXS were used. Microhardness of the samples was assessed using a microhardness tester by the Vickers method. The analysis of gas impurities was carried out on a gas analyzer. It is shown that nitriding of heat-resistant nickel alloy EP741NP is possible at the stage of metal powder production, without significant loss of alloying components and a sharp change in chemical composition. An increase in microhardness of the obtained nitrided samples was noted in comparison with the initial one.

Combination of Spray Forming and Metal Powder Productions by the Internal Mixing Atomizer with a Substrate

2006 ◽  
Vol 505-507 ◽  
pp. 1237-1242 ◽  
Author(s):  
Muh Ron Wang ◽  
Pin Jen Chen ◽  
Je Rei Yang ◽  
Jin Shen Chiu ◽  
Tien Chu Lin ◽  
...  
Keyword(s):  
Particle Size ◽  
Production Rate ◽  
Metal Powder ◽  
Deposition Rate ◽  
Spray Forming ◽  
Metal Powders ◽  
Two Phase ◽  
Powder Production ◽  
Internal Mixing ◽  
Impinging Flow

This paper describes the performance of an atomizer coupled with a substrate which produces metal powder and spray forming materials simultaneous in the spray chamber. Ultra fine metal powders are produced from this process. The melt is atomized by a twin-fluid atomizer with internal mixing mechanisms. The molten spray injected from the swirling chamber of the atomizer is then impinged upon the substrate to form the two phase impinging flow. The deposition rate of the molten spray on the substrate is controlled by the diameter of the substrate, the height of the substrate ring and the distance of the substrate from the outlet of the atomizer. This in turn determines the powder production rate of the spraying processes. Experimental results indicate that the deposition rate of the spray forming material decreases as the distance between the substrate and the atomizer increases. For example, the deposition rate decreases from 48% to 19% as the substrate is placed at a distance from 20cm to 40cm. On the other hand, the metal powder production rate and its particle size increases as the substrate is placed far away from the atomizer. The production of metal powder with mean particle size as low as 3μ m level has been achieved, a level which is not achievable by the conventional gas atomization processes.

scholarly journals Study of Microstructure Features and Properties of Metals Obtained by Hot Isostatic Pressing

2021 ◽  
Vol 24 (4) ◽  
pp. 4-10
Author(s):  
A.A. Khlybov ◽  
D.A. Ryabov ◽  
M.S. Anosov ◽  
E.S. Belyaev
Keyword(s):  
Fractal Dimension ◽  
Relative Density ◽  
Metal Powder ◽  
Hot Isostatic Pressing ◽  
Microstructural Analysis ◽  
Fractal Dimensionality ◽  
Spherical Particles ◽  
Metal Powders ◽  
Isostatic Pressing ◽  
Different Temperatures

The aim of this research is to study the features of the structure and properties of alloys obtained using the technology of hot isostatic pressing (HIP) of metal powders. The study was carried out in the temperature range of interruption of the HIP cycle from 670 to 1150 °C on alloys 08Cr18Ni10Ti and Cr12MoV. For processing images of microstructures and assessing their fractal dimension, software has been developed in the MATLAB environment. The results of microstructural analysis of the metals under study showed that complete sintering of powders is observed at a HIP temperature of 1150 °C; at lower temperatures, pores and unsintered spherical particles of metal powder are observed in the microstructure of the alloys. The grain size of alloys obtained by HIP is determined, first of all, by the size of the initial fraction of the metal powder. Based on the results of evaluating the density of alloys obtained at different temperatures of the HIP, a relationship was established between the relative density of the alloy and the process temperature. Based on the results of fractal analysis, the relationship between the fractal dimensionality of the microstructure of the alloy and the HIP temperature and the relative density of the metals under study has been established. The obtained dependences are linear. The error in estimating the relative density from the obtained dependencies is, on average, 5 %. The data obtained in the course of the study make it possible to estimate the density of metals obtained by hot isostatic pressing of metal powders by evaluating the fractal dimension of the microstructure image.

ANCORSTEEL 2000

Alloy Digest ◽  
2010 ◽  
Vol 59 (10) ◽  
Keyword(s):  
Fracture Toughness ◽  
Powder Metallurgy ◽  
Physical Properties ◽  
Production Process ◽  
Tensile Properties ◽  
Molten Steel ◽  
Alloy Powder ◽  
Powder Metal ◽  
Metal Parts ◽  
Powder Production

Abstract Ancorsteel 2000 is a water atomized low-alloy powder metal containing Ni, Mo, and Mn and is useful in powder metal parts requiring greater hardenability. In the powder production process used to make Ancorsteel, molten steel is atomized into irregular, homogeneous particles which are then annealed to produce uniform, dependable steel powders. Ancorsteel grades are designed for powder metallurgy parts requiring densities exceeding 6.7 g/cm^3 (0.24 lb/in.^3). This datasheet provides information on composition, physical properties, hardness, and tensile properties as well as fracture toughness. It also includes information on powder metal forms. Filing Code: CS-157. Producer or source: Hoeganaes Corporation.

ANCORSTEEL 1000

Alloy Digest ◽  
2010 ◽  
Vol 59 (2) ◽  
Keyword(s):  
Compressive Strength ◽  
Physical Properties ◽  
Production Process ◽  
Molten Steel ◽  
Powder Metal ◽  
Powder Production ◽  
Low Levels

Abstract Ancorsteel 1000 is the workhorse of the Ancorsteel series. It has low levels of carbon and oxygen and good compressibility. In the powder production process used to make Ancorsteel, molten steel is atomized into irregular, homogeneous particles that are then annealed to produce uniform, dependable steel powders. This datasheet provides information on composition, physical properties, and compressive strength. It also includes information on powder metal forms. Filing Code: CS-152. Producer or source: Hoeganaes Corporation.

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