The pr esent i nvesti gati on em phasiz ed on the liberation and beneficiation characteristics of Indian chromite oreto improve the. Cr: Fe ratio. The off grade chromite samp le ofSukinda region ...
To thoroughly understand the relationship between heat treatments and characteristics of both microstructure and corrosion behavior of Ni–Fe–Cr alloy 028, a series of heat treatments were carried out. The area fraction of precipitates increases with increasing duration of aging treatment at 900 °C. The precipitation rate is higher at 900 …
A V–Ti–Cr–Fe alloys system was developed in this paper. For V x – (Ti–Cr–Fe) 100−x (Ti/ (Cr+Fe) = 1.0, Cr/Fe = 2.5, x = 20–55) alloys, with the increase of V content, the hydrogen absorption capacity and desorption capacity both increase, and plateau pressure decreases. Two phases, BCC and Laves phase, appear when x < 30, …
Гудуляс К. МАГНИТНО РАЗДЕЛЯНЕ НА ХРОМСЪДЪРЖАЩИ ЛАТЕРИТИ. The separation of the iron rich grains at 60 mТ induction was accompanied with high Cr content in the concentrate. It reached 48.6% at cross slope of 50, at 80.9% extraction rate. In 20% FeO the Cr/Fe ratio of the concentrate was 2,15.
хромит хүдэр баяжуулах жижиг үйлдвэрийг хэрхэн хромитийн хүдэр боловсруулах үйлдвэрүүд. 2021 7 8 Уулын хүдэр бэлтгэх тоног төхөөрөмжийг бутлах арга 2016 онд Хүдрийн ил уурхай нь 21700 мян.м3 уулын ...
As the Cr/Fe ratio increases (i.e., decreasing VEC), there is a phase transition from face-centered-cubic (FCC) to body-centered-cubic (BCC) and Heusler-type β′ -Ni 2 TiAl (L2 1). When x is between 17.1 and 22.3, the alloys, with the mixed structure of the FCC and BCC/L2 1 phases, behave like composites with a sharp increase in strength …
Densities and their temperature coefficients of liquid Cr–Fe, Fe–Ni, and Cr–Ni binary alloys have been measured containerless using the technique of electromagnetic levitation. Data have been obtained in a wide temperature range including the supercooled region. The density measurements indicate that these binary systems have a small and …
It is equally important to control the morphology and size of carbides and inclusions, and even more important to control carbides in steel [1–3].Cementite (Fe 3 C, FC) is the most common carbide in steel, and it is widely found in carbon steel or alloy steel [4, 5].Cr and Mn are the main metal elements doped in FC, they generally replace the …
In this work, stainless steel pickling sludge (SSPS) and Ni-bearing electroplating sludge (ES) were co-treated to prepare Ni matte and Fe–Cr–Si alloy. A two-stage sulfurization-smelting method was used for preparing the Ni matte. At the sulfurization stage, carbon, SSPS, and ES were mixed and reacted at 1000 °C. It was found that NiO …
Abstract. Structural analyses were performed on alloy particles of chromium-rich Cr-Ni, Cr-Fe, Cr-Co, and Cr-Ni-Fe systems. Fine alloy particles (100 to 1000Å in diameter) were …
In Fig. 1, the small composition range of P observed by [ 2008Ai] is neglected and the phase is shown at the fixed composition of Fe 18 Zn 79 Cr 3. At 600 °C, the solubility of Zn in (Cr) is 2.5 at.% and that of Cr in Γ, δ, and liquid is 5.4, 3.1, and 1.4 at.% respectively. The Cr-Zn binary compounds were not found at 600 °C.
Five Al-Cr-Fe-Ni based high entropy model alloys, mainly a mixture of FCC and BCC or single FCC phase, have been designed and prepared. The corrosion tests of as-cast alloys in oxygen-containing molten Pb show their promising corrosion resistances at 600 °C, which is due to the formation of protective (Fe,Cr) 3 O 4 /Al 2 O 3 or Cr 2 O 3 /Al …
хромит боловсруулах үйлдвэр манганы боловсруулах үйлдвэр Баяжуулах үйлдвэр ашиглалтад орсноос хойш нийт 1 сая тонн зэсийн агууламжтай баяжмал олборлов Хам хөвүүлэн баяжуулах хэсгийг …
Chromite-platinum mineralization of clinopyroxenite-dunite massif Zheltaya Sopka, North Ural/ Хромит-платиновая минерализация клинопироксенит ...
In this database, the model (Al,Cr,Fe,Mn,Ni) 8 (Al,Co,Cr,Fe,Mn,Ni) 5 is used for γ-D8 2 and the model Al 1 2 (Co,Cr,Fe,Mn,Ni) 5 (Al,Cr,Fe,Mn,Ni) 9 is used for γ-D8 10. These models were selected based on those used in the included ternary assessments and for convenience. Both models might be too simple for general use, but worked …
Fig. 1 shows the XRD patterns of the Ti–Zr–Cr–Fe–V based alloys. The crystallographic structures of all the alloy samples are determined as a single C14 Laves phase without other phases detected. The lattice parameters and unit cell volume of each alloy sample calculated from the corresponding XRD patterns are listed in Table 1.With …
An experimental study of the Cr-Fe-W system has been made using a diffusion couple technique. A number of tie-lines have been determined using a scanning electron microscope with energy dispersive X-ray analysis equipment. The structures of the observed intermetallic phases were determined by means of X-ray diffraction. The …
The nickel content effects on the strength, plasticity, and low-cycle life of hardened and aged specimens of different modifications of austenitic iron-nickel steels and alloys in the initial state and after preliminary high-temperature hydrogenation in hydrogen at a pressure of 30 MPa and temperatures of 293, 773 and 973 K were studied. At 293 …
We investigate how low-weight carboxyl-rich OC influences the transformation of ferrihydrite (Fh) and controls the mobility of Cr (VI/III) in reducing environments and …
The vast majority of produced Cr is used during the production of stainless steel, which owes its corrosion resistance mainly to the presence of Cr. In turn, stainless …
Cr:Fe ratio feed was 0.55, after the process for size variation, roll speed, feeder speed and electric current decline Cr:Fe Ratio around 50.5%. When size -65+100 mesh Cr:Fe ratio was 0.282. At ...
Structural analyses were performed on alloy particles of chromium-rich Cr-Ni, Cr-Fe, Cr-Co, and Cr-Ni-Fe systems. Fine alloy particles (100 to 1000Å in diameter) were prepared by evaporation of parent alloys in argon at 20 torr. In addition, alloy structures of bulk specimens of the Cr-Ni system were investigated using X-ray diffraction techniques to …
Chromium–iron (CrFe) binary alloys have recently been proposed to serve as the "inert" anode for molten oxide electrolysis (MOE). Herein, the effects of anodic …
Previously, we demonstrated the reduction of Cr(VI) via Fe(II) produced during iron respiration by using four structurally diverse ferric (hydr)oxides (α-Fe 2 O 3, α-FeOOH, 2- and 6-line ferrihydrite) (Wielinga et al., 2001); data for two-line ferrihydrite as the terminal electron acceptor are provided in Figure 1a. Differences in sustained reduction …
Fig. 1 (i)–(j) exhibit element distribution of C0.0 and C0.01, and EDS mapping results are in Supplementary Fig. S2-S3, respectively, showing that FCC phases in both HEAs are (Ni,Fe,Cu)-rich, while BCC phases are (Cr,Al)-rich, and other elements are relatively homogeneously distributed. And in C0.01, certain increase in the enrichment of …
Ferrochrome (FeCr), a relatively crude alloy comprised primarily of iron (Fe) and chromium (Cr), is vital for the production of stainless steel. FeCr is produced from …
The synthesis process of the nanoporous Co-Cr-Fe-Ni-Nb catalyst is shown in Fig. 1. Fig. 2 shows the XRD patterns before and after dealloying. The CoCrFeNi 2 Nb 0.74 precursor ribbons are composed of FCC solid solution and Laves phase. After dealloying, the peaks of FCC phase become weaker, while the peaks of Laves phase become …
The iron and a series of Fe-Cr alloys, listed in Table 1, were produced in button form having 24 mm diameter and 9 mm thick from appropriate weights of interstitial free (IF) steel and Fe-35Cr master alloy by using a laboratory vacuum arc melter (Edmund ™ make AM200).The ingot buttons were remelted four to five times in the melter …
The doping of Al, Si, Zr, Cr, Fe, Co, and Ni used in the synthesis of various alloys suggested a nonmonotonic complicated impact on the enthalpy of dehydrogenation [17]. And obtaining the composition with ideal performances is pretty hard relying on only empirical knowledge and experimental tests. It is necessary to give an explicit relation ...
Our results provide a profound understanding of the microscopic diffusion mechanism of Cr atom in the ferritic Fe-Cr alloy, which could give theoretical guidance …
A series of non-equiatomic Al-Co-Cr-Fe-Nb-Ni high-entropy alloys, with varying levels of Co, Nb and Fe, were investigated in an effort to obtain microstructures similar to conventional Ni-based superalloys. …