قائمة الطعام
The characteristics and evolution behavior of non-metallic inclusions during the melting process were investigated as well. Results demonstrated that the heavy-density alloy prepared by VIM/VAR exhibited considerable process feasibility and cleanliness. The total impurity (O, N, S) content decreased from 130 to 19 ppm because …
The behavior of non metallic inclusions was investigated on undeformed and plastically deformed ferritic steels. Damaging of non metallic particles increases with strain level. Extensive cracking of the inclusions is generated by cathodic charging at a high current density. High resolution tritium autoradiography shows that manganese sulphides ...
A technique to extract in-plane thermal conductivity of thin metallic films whose thickness is comparable to electron mean free path is described. Microscale constrictions were fabricated into gold films of thicknesses 43nm and 131nm. A sinusoidal voltage excitation across the constriction results in a local temperature rise. An existing …
Fatigue cracks initiating from surface and sub-surface non-metallic inclusions (NMIs) have recently been demonstrated to be a necessary but not sufficient explanation for atypically short low-cycle fatigue life in Inconel 718 alloy at intermediate temperature. Therefore, the early stages of short crack propagation from surface NMIs …
A series of quinary (Al 1/4 Ni 1/4 Zr 1/4 Co 1/4) 100-x Y x (x = 16–28 at.%) high entropy metallic glass ribbons were successfully fabricated through the high-speed single roller melt-spinning method. The effects of rare-earth element yttrium content on the microstructure and performances of alloy ribbons were systematically investigated by X …
Published: 31 March 2021. Volume 52, pages 1508–1520, ( 2021 ) Cite this article. Download PDF. Wan-Yi Kim, Gi-Ju Nam & Seong-Yeon Kim. 827 Accesses. 10 …
Goto and Wantanabe investigated non-metallic inclusions in plain carbon (0.25 wt.% C) and silicon steels (0.08 wt.% C, 4.06 wt.% Si). They compared the use of …
Considerable research has been conducted over recent decades on the role of non‑metallic inclusions and their link to the machinability of different steels. The present work reviews the mechanisms of steel fractures during different mechanical machining operations and the behavior of various non-metallic inclusions in a cutting zone. More …
1. Introduction. Non-metallic inclusions (NMIs) are naturally occurring products which are formed during both the steel production and the manufacturing/treatment processes involving the metal in a liquid state [1]. NMIs are chemical compounds of metals such as, for example, iron, manganese, aluminium, and silicon with non-metals such as, …
Size and shape of remaining non-metallic inclusions were investigated. The samples were prepared by Standard Guide for Preparing and Evaluating Specimens for Automatic Inclusion Assessment of Steel (ASTM E 768-99) method and the results were reported by means of the Standard Test Methods for Determining the Inclusion Content …
Using this model, the effect of inclusion size on attractive capillary force has been investigated, demonstrating that larger inclusions are more strongly attracted. Better understanding of agglomeration behavior of nonmetallic inclusions in the steelmaking process is important to control the cleanliness of the steel.
The non-metallic inclusions on the other side (Side 2) of the chips (Sample T) were also investigated by using EE with a dissolution depth of 47 μm. The samples T and H2 having almost similar dissolution depths were used for a comparison of the behavior of various NMIs on the different sides of the chips.
Dong Woon Kim, Tae Sung Kim, Geun Ho Park & Joo Hyun Park. 389 Accesses. Explore all metrics. Abstract. The effect of the reaction between alloy …
Impurities such as Fe, Ni and Cu and non-metallic inclusions such as oxides, nitrides, carbides, sulfides and fluorides are harmful to the quality and various properties of magnesium alloy sheets produced by twin-roll casting. In this study, the changes of the content of Fe and non-metallic inclusions in AZ31B magnesium alloys …
Firstly, this paper analyzed the effect of surface physical properties of eight non-metallic materials on CaCO 3 scale growth and their mechanisms through shear experiments. Then, the influence of surface properties (roughness, contact angle, surface energy) on the scale growth characteristics was investigated.
Luo and Ståhlberg (2002) analyzed deformation behavior of non-metallic inclusions in plate rolling process under different rolling temperature, friction and rolling schedule by finite element simulation (FE simulation). Hai-liang Yua et al. (2009) were investigated effect of initial inclusion geometry analytically.
In this study, the effect of non-metallic inclusions (NMIs) on tensile behavior of titanium stabilized Fe-20Cr-9Ni steel was investigated. The size of NMIs was decreased via the electro-slag ...
In the present paper, the nano-indentation technique is used to investigate the effects of inclusions on machinability of free-cutting steel. Firstly, the hardness, elastic moduli, and load–displacement curves of inclusions are analyzed and compared with matrix. Secondly, the effects of inclusions on machinability are investigated using nano …
The focus of this study is to investigate non-metallic inclusions (NMIs) in stainless steels before (in steel samples) and after machining (in steel chips). In this …
Non-metallic inclusions, their formation and evolution during liquid steel processing, their impacts to downstream processing and products, and characterization methods have been thoroughly covered in recent reviews [1],[2],[3],[4],[5]. These reviews ... Al – O were investigated. MATERIALS AND METHODS 1. Material Details for Industrial Samples
Nonmetallic inclusions (NMIs) are a matter of concern with respect to several properties of steels, such as fatigue, formability, toughness, machinability, and …
The dominant failure type in the investigated cast steel AISI 4140 after hot-isostatic pressing are clusters of endogenous (primary, secondary) non-metallic inclusions mainly of the alumina-type. Four different internal crack initiation types were clearly identified in the very high cycle fatigue by plotting (i) the radii of the fisheyes and ...
In this study, the influence of non-metallic inclusions on the fatigue behavior of 30MnVS6 steel containing different inclusion sizes and surface roughness has been investigated. Scanning electron microscope (SEM) was used to …
Non-metallic inclusions were investigated in a two-dimensional (2D) cross-section method as well as extracted by a three-dimensional (3D) electrolytic extraction method. It was found that AlN was the dominant inclusion phase, also a small amount of Al 2 O 3 inclusions were observed.
The characteristics of non-metallic inclusions in 347 stainless steel samples taken during a net-shape casting process after different holding times and melting temperatures were investigated ...
Abstract Non-metallic inclusions that originate from secondary metallurgy treatments may provoke nozzle clogging during continuous casting and lead more or less directly to surface defects on final products. The amount of these non-metallic inclusions (oxides or nitride) in the solid or liquid steel is governed by the steelmaking practice and …
Although alumina-based inclusions in Al-killed steel have been widely investigated, few studies focus on non-metallic inclusions in Si-killed steel. Most high-carbon steel, which is expected to have higher potential for the formation of alumina, is deoxidised by silicon to avoid alumina-based inclusions. Many types of high-carbon steel …
The modification of the chemical composition of non-metallic inclusions by rare-earth elements in the new-developed microalloyed steels was discussed in the paper. The investigated steels are assigned to production of forged elements by thermo-mechanical treatment. The steels were melted in a vaccum induction furnace and …
The structure of a multicomponent metallic glass, Mg65Cu20Y10Ni5, was investigated by the combined methods of neutron diffraction (ND), reverse Monte Carlo modeling (RMC) and high-resolution ...
This research investigated alternative strategies for making buried non-metallic pipes (CFRP, GFRP, and PVC) easily locatable using Ground Penetrating Radar (GPR). Pipe diameters up to 12" and buried with up to 4 ft. of soil cover were investigated. The findings of this study will help address the detection problem of non-metallic …
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