The objective of the present research was to use fuzzy logic sets with a particle swarm optimization technique for modeling and optimization of process operating parameters by considering grinding time, solution pH, rotation speed, mill crop load, and solids percentage on the wear rate of high chromium alloy during phosphate grinding.

High-temperature oxidation experiments were conducted at 1073 K with a muffle furnace (KBF828N, Koyo Thermo Systems, Japan). The Cr specimens were placed on a silica dish and, after the temperature of the furnace was stabilized, inserted into the furnace. ... High temperature oxidation of chromium: kinetic modeling and …

A data set derived from 29 tests on the wear rate of a high chromium alloy liner were used for this research. The experimental data were obtained by the University of Kentucky (Chen et al., 2006).The operating conditions and the total wear rate for each experiment, measured by the coupon weight loss are shown in Table 1.The wear rate in …

Owing to the high contents of chromium, the model alloys have excellent steam oxidation resistance. A way to preserve favorable steam oxidation properties and diminish undesirable (Fe,Cr)-σ-phase ...

Many high-temperature alloys rely on the development of a chromia-containing scale for protection against oxidation and corrosion. ... In this paper a model for chromium and oxygen diffusion in chromia is presented. Diffusional mobilities in Cr 2 O 3 are assessed, based on available literature data. This makes it possible to model the …

The chromium removal mechanism of the strain was analyzed, and a kinetic model of the reduction process was established. The chromium-reducing ability of the strain was 500 mg/L, the optimum pH value was 7, the optimum temperature was 35 °C, the optimum cultivation time was 24 h, and the optimum ratio of bacteria to waste (volume …

Roll straightening is an important process link in sheet production. Due to the step change of the straightening force during the straightening bite and the tail flick, the whole-plate length straightening and pressing process changes will affect the straightening effect. Based on the solution of the curvature integral straightening process, this paper …

Based on the content of elements in high chromium alloy and the manufacturing preparation process of the alloy, a method for constructing the molecular dynamics (MD) model was proposed to study the machinability of the alloy.

Testing and numerical modelling of high-chromium stainless steel press-braked angle and channel section stub columns and beams were carried out by Zhang et al. [8] to study their cross-section local buckling behaviour and resistances, while the flexural-torsional buckling behaviour and resistances of press-braked angle section intermediate ...

salt of chromium and almost all chromium based industries originate from chromate. Chromium based industries generate considerable quantity of pollutants containing toxic hexavalent chromium (Cr+6 ...

Based on research on high-chromium cast irons conducted at the Faculty of Mechanical Engineering STU in Slovakia, the following conclusions were reached: with …

With regard to the material modelling of grade EN 1.4420 high-chromium stainless steel, the average measured (engineering) stress–strain curve was converted into the true stress–plastic strain curve and then assigned to the beam-column FE models. For each high-chromium stainless steel welded I-section, the membrane residual stress …

1. Introduction. High chromium cold work tool steels are widely used for the production of moulds, dies and cutting tools for diverse industries such as plastic and food processing industries owing to their high strength, toughness, hardness and resistance against wear and corrosion in service [[1], [2], [3]].These mechanical properties and wear …

A series of MD simulations were performed to investigate the nanomechanical property of the high chromium alloy by using the MD model. The maximum depth of 2 …

In this experimental study, the effects of cutting parameters and insert types on the surface roughness and cutting force components were investigated during hard turning of high chromium AISI D2 tool steel under dry cutting conditions. Three different cutting speeds, feed rates, and cutting depths were chosen as machining parameters, …

There are few numerical simulations on high chromium cast iron materials, and their high-temperature thermo-physical parameters are also rare, which brings difficulties to the numerical modeling. ...

The new cast high chromium alloy is the conventional material of the nuclear main pump thrust-bearing with good wear and corrosion resistance. According to the structural characteristics of high chromium alloy, the simulation model and the coupling potential function were constructed to study the grinding damage layer using molecular …

In this paper, an advanced multiaxial creep model [1], which incorporates damage effects, has been used to predict CCG in P91 high chromium steel. The model …

Nanofiltration and reverse osmosis are investigated as a possible alternative to the conventional methods of Cr(VI) removal from model water and industrial effluent. The influences of feed concentration, water recovery, pH, and the coexisting anions were studied. The results have shown that retention rates of hexavalent chromium can reach …

High-chromium austenitic stainless steel grade EN 1.4420 is a recently developed new grade and features a high content of chromium and a low content of nickel. ... (FE) software ABAQUS [29]. FE models were firstly developed and validated against the test results and then employed to perform parametric studies to generate further …

A hypereutectic high chromium cast iron (HCCI) is featured with high abrasion resistance and hardness, making it one of the most widely used materials in mining, minerals and cementation industries.

The oxidation of two industrial steels with different chromium content (9 and 12 wt%), oxidised for up to 120 h at 750 °C in air has been investigated experimentally and by means of two-dimensional theoretical methods. The numerical model approach, which we call Applied Simulations of Thermodynamic Reactions and Interphase Diffusion …

The accuracy of the model was verified by the internal structure and by calculating the nanohardness and density of the high chromium alloy model after adequate relaxation to studying the nanomachining performance. The coordination number of the high chromium alloy is about 4.3 calculated by integrating the radial distribution function.

The objective of the present research was to use fuzzy logic sets with a particle swarm optimization technique for modeling and optimization of process …

In this study, a three-dimension finite element (FE) model is carried out in order to analyze the effect of the barite rocks' impact on the hammers made from High …

Therefore, the traditional treatment method of chromium-containing wastewater is to reduce Cr(VI) to Cr(III) and precipitate as Cr 2 O 3 ⋅ xH 2 O at high pH values 16,17,18,19,20,21.

1. Introduction. In the mineral mining industry, the estimated total economic losses resulting from the replacement of wear parts and idle equipment amount to approximately 68 billion dollars annually [1].By improving the wear resistance of the wear parts, such losses could potentially be reduced by 30% within 20 years [1].The high …

In the present study, the main purpose is investigation of the coatings thickness effect on the fatigue life of AISI 1045 steel. Herein, two different coatings of warm galvanization and hardened chromium have been used on the specimens. Fatigue tests were performed on specimens with different coating thicknesses of 13 and 19 µm. In the …

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Owing to the high contents of chromium, the model alloys have excellent steam oxidation resistance. A way to preserve favorable steam oxidation properties and diminish undesirable (Fe,Cr)-σ-phase ...