High chromium white cast irons are widely used in many engineering applications as they extend the service life beyond ... [17–19]. In the past few decades, the effects of velocity [20,21], impact angle [22,23], particle properties [24,25], geometric structure [18,19], and material properties [26–28], etc., on erosion-corrosion of materials ...Web
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Impact wear tests with sizes of: length of 10 mm, width of 10 mm, and height 30 mm. Hardness measurement tests with sizes 10 mm long, 10 mm wide, and 10 mm high. The impact wear test was conducted on a metallographically polished rectangular specimen using a dynamically loaded abrasive wear tester with the model MDL-10; the schematic …Web
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Acute Exposure. No proven antidote is available for chromium poisoning. Acute poisoning is often fatal regardless of therapy. Treatment in cases of acute high-level chromium …Web
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Wear rates of grinding media can be misrepresented by marked ball wear tests (MBWT). Galvanic interactions between dissimilar grinding media can be affected by the chromium content in the media and the presence of oxygen in the environment. Corrosion, one component of wear, can be affected by many variables. Corrosion rates …Web
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The effect of destabilization temperature on the microstructure and impact toughness of high chromium cast iron was investigated. The result showed that the microhardness of matrix decreased from 860 to 332 HV with the increase of destabilization temperature from 950 to 1100 °C. The impact toughness of the alloy increased from 5.3 …Web
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Chromium is not only the most important alloying element in high-chromium cast iron, but also significantly increases the nitrogen solubility in liquid with lesser tendency for nitride formation compared to Nb. ..., while investigating the influence of nitrogen additions on impact toughness of high-chromium cast irons. They reported that the ...Web
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Chromium is an important heavy metal that is involved in biological metabolism, but Cr exposure can induce a severe impact on occupational workers or …Web
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In addition, the impact test result indicates that, compared with the hypereutectic high-chromium cast iron without titanium addition, the impact toughness value of hypereutectic high-chromium ...Web
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GCr15 bearing steel, a representative of high-carbon-chromium bearing steel, has been widely studied because of its low alloy content [1], [2], [3] and excellent mechanical properties, such as good wear resistance [4], [5], [6], high fatigue life [7, 8] and high hardness [9], [10], [11]. With the increasingly harsh service environments, it is ...Web
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Heavy metals are defined as metals with relatively high density and atomic weight, and their various applications have raised serious concerns about the …Web
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It is attempted to enhance the impact toughness of industrially used high chromium white cast iron (WCI) without sacing wear resistance. The microstructure is engineered by cyclic anneal-ing ...Web
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The detailed deformation mechanism and its microstructural modifications of white cast iron grinding balls used in comminution have been investigated using transmission electron microscopy (TEM) and XRD. De-shaping is the primary mode of ball consumption, and fracture of balls is a relatively uncommon failure mode. Deshaping is …Web
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High chromium cast irons (HCCIs) are primarily used in mining machinery, wear resistant lining board, crusher jawplate, etc. because of their excellent wear resistance and high hardness [1], [2], [3]. ... The impact toughness of the coating samples also increased with the increment of Ni additions, and reached the maximum of 4.8 J/cm 2 at …Web
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iron does not have a high impact strength in its as-cast condition due to the formation of chromium ... In this publication, the influence of various inoculants on the microstructure of high-chromium cast iron and, thus, on the strength properties of castings that are made of this type of iron, has been proven. As can be seen in Figure 3, the ...Web
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The microstructure of high chromium cast iron treated by water cooling, 10% PAG coolant and 20% coolant was white carbide + tempered martensite + retained austenite, and its impact toughness and ...Web
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Chromium contamination and its impact on the environment. Unrestricted discharge of toxic hexavalent chromium [Cr(VI)] has threatened the environment. ... A high concentration of Cr interferes with plant photosynthetic activity, water, and minerals nutrient uptake mechanisms, which leads to the slow development of plants (Davis et al., 2002).Web
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Fast facts on chromium. Chromium is a mineral that humans need in very small quantities. Good sources include broccoli, liver, and brewers' yeast. Chromium supplements may enhance muscle mass ...Web
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Chromium. Chromium is an essential mineral that the body needs in trace amounts. It is naturally present in a wide variety of foods, though only in small amounts, and is also available as a supplement. Chromium enhances the action of the hormone insulin. [1) It is also involved in the breakdown and absorption of carbohydrate, proteins, and fats.Web
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resistance of the high chromium cast iron. CHUNG, et al[3], investigated the effect of alloying titanium addition on the microstructure and wear resistance of hypereutectic high chromium white cast iron. The results showed that a fine eutectic microstructure with dispersed TiC carbide was achieved when 2 wt.% Ti was added. The eutectic structureWeb
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Further high chromium% decreases the impact toughness and the thermal conductivity of the roll. Low thermal conductivity resulted in temperature gradient across the roll cross section. The above observations suggest that inferior core microstructure in combination with stress factor (thermal, residual and mechanical) caused the roll failure in ...Web
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Chromium contamination and its impact on the environment Unrestricted discharge of toxic hexavalent chromium [Cr(VI)] has threatened the environment. …Web
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Microcracks were observed in the high chromium cast iron impact fracture after water cooling and 10% PAG. After 20% PAG cooling, there is a slight tear edge on the high chromium cast iron impact …Web
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Safety considerations: Potentially could cause weight loss, anemia, thrombocytopenia (low platelet counts), liver problems, renal (kidney) failure, rhabdomyolysis (muscle breakdown), dermatitis, and …Web
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The origin of hexavalent chromium in groundwaters can be anthropogenic and/or geogenic. The natural occurrence of Cr 6+ in groundwater has been reported in many regions of the world and occurs by oxidation of Cr 3+ to Cr 6+ in the presence of Mn oxides of ultramafic rocks and serpentinites in ophiolite complexes. Pumping and intensive use …Web
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In the present study, a high chromium cast iron (HCCI) alloyed with Mo (16 wt.% Cr-6 wt.% Mo-2.4 wt.% C) with excellent wear resistance was bonded to a low carbon steel (LCS) by surface liquid-phase sintering. The bimetal was also subjected to a quenching + tempering treatment. The diffusion behavior of the atoms between the HCCI and LCS …Web
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The variations of microstructure and mechanical properties of a high-chromium cast iron for rolls were studied from as-cast to the final heat treatments. Results show that the as-cast microstructure of the HCCI consists of M 7 C 3 carbide, M 23 C 6 carbide, martensite matrix, and retained austenite. The large dendritic …Web
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A new type of high chromium cast iron (HCCI) was prepared, and its microstructure, mechanical properties, and abrasion resistance were investigated systematically. Results showed that after surface carburizing and chromizing, the microstructure of HCCI mainly consists of martensite, boride (M2B), and carbide (M7C3), …Web
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