Cn102899469b heattreatment method of highchromium wear. About iron chromium alloy iron chromium is one of numerous metal alloys sold by american elements under the trade name ae alloys. The high chromium cast irons respond to heat treatment when the carbon and chromium contents are appropriately adjusted. Alternatives to welding chrome white iron astm a532. Microstructure and wear resistance of high chromium cast. Steel castings handbook supplement 7 welding of high. In mining, wear is caused by operational problems in which generate high costs. The standard procedure most commonly used for the classification of this kind of cast iron alloy is astm a53210 2014. They are recommended for a ph range of 2 to 11 where erosives are present.
The samples were cut from the casting made from chromium cast iron, with the chemical composition shown in table table 2. The cutting tools selection on machining high chromium. High chromium irons description high chromium irons provide excellent erosion resistance and a reasonable degree of corrosion resistance due to their high alloy content, thus surpassing all other cast irons for use in aggressive services. Hc28s abrasion resistance is comparable to chromenickel irons astm a532 class. Microstructural characteristics and mechanical properties. Cr 23 mo 0 ni 0 cu 0 five samples with dimensions o15. The paper presents test results of irons which contain in wt. Learn more about chromium uses, effectiveness, possible side effects, interactions, dosage, user ratings and products that contain chromium. The distribution of chemical elements over the area of the corresponding metallographic image is shown for the example of copper, which is extremely nonuniformly distributed, even within a single grain. The microstructure of this highchromium iron was studied using metallurgical optical microscopy om and compared to the hadfield steel. The type and morphology of the eutectic carbides in high chromium cast iron depend upon both chemical composition and solidification rate 3, 14, 2426. Microstructural modifications of ascast highchromium white. This study was carried out for different solidification rates, so the alloys were cast into wedgeshaped copper moulds.
The carbide types known to be present in the high chromium cast irons are m7c3, m 3c, m 23 c6 and m 6c, with increasing m. High chromium cast irons are widely used as abrasion resistant materials. The hardness and unnotched charpy impact strength of the hcwi alloy and hadfield steel were examined at ambient tem. High temperature erosion high chromium white cast iron cr contents type of carbide a b s t r a c t this present study investigated effect of chromium content on high temperature erosive. Heat treatment in high chromium white cast iron ti alloy. Highchromium irons have good mechanical properties, high hardness in a cast state, low fluctuation of hardness when properties change. In the ascast condition, the microstructure of high chromium molybdenum white iron consists essentially of dendrites of austenite in a matrix of eutectic mixture of austenite and fe, cr 7 c 3 carbides. The mechanical properties of highchromium cast irons are better than those of the highsilicon cast irons. Microstructure and wear resistance of high chromium cast iron containing niobium li wei male, born in 1963, ph.
Molybdenum is even more effective when used in combination with copper, chromium, nickel, or both chromiumandnickel. The mechanical properties of high chromium cast irons are better than those of the high silicon cast irons. Effect of heat treatments and alloying additions article pdf available in international journal of cast metals research 226. Metallurgical and materials transactions aphysical metallurgy and materials science, 2712. The properties related to the service performance of the hccis containing niobium, namely the abrasion resistance in wet application and impact toughness were also examined. The heat treating method of a kind of highchromium wearresistant white cast iron cr28. The silicon element decreases the hardenability of the high cr white cast iron. The correlation between the colors of the pixels in the image is assessed by. Effect of niobium on the microstructure of high chromium.
The cutting tools selection on machining high chromium cast iron. The study was carrying out on samples cut from the casting. High chromium cast iron, heat treatment, hardening, tempering, soft annealing 1. Alloy data sheet high chrome white iron 25% penticton foundry. Chapter 1 high chromium cast irons chiang mai university data of the parameters of heat treatment of high chromium cast iron, and optimal conditions for heat treatment was proposed for casts of similar properties and parameters. Effect of heat treatment on microstructure and properties of semi. High chromium white cast irons are an important class of wear resistant materials. In this communication, the initial results of an investigation to use niobium as an alloying element in highchromium irons are described. In this study, high chromium white iron hcwi alloy and the hadfield steel were studied.
Relative erosioncorrosion wear rate of fe15 to 30cr3c has been reported. Pdf heat treatment in high chromium white cast iron ti alloy. Grain boundary diffusion of iron, cobalt and chromium in. Pdf abrasive wear behavior of high chromium cast iron and. Jan, 2016 the 25% cr alloy is the most common high chrome white iron poured at penticton foundry. High chromium white iron, in the form of castings and weld overlays, is one of the alloys used to improved wear resistance and equipment longevity. Solid particle erosion and erosioncorrosion of materials. The heat resistant alloys are generally higher in alloy content than the. This alloy has great abrasion resistant properties especially against gouging, grinding and scratching. In the present work, additions of 2% vanadium, 2% niobium and 2% titanium were respectively made to a highchromium white iron 17% cr to analyse the effect of these elements on the ascast structure of the alloy, and their influence on the materials hardness.
Optimizing hardenability of high chromium white cast iron. The high chrome wearresistant cast iron material is prepared from iron as a main raw material, and carbon, silicon, manganese, sulphur, phosphorus, chrome, molybdenum, nickel and copper as auxiliary materials in manners of melting and casting after preparation. Pdf analysis of the high chromium cast iron microstructure after. The role of retained austenite on the performance of cast iron based grinding media balls is somewhat controversial. Pdf the influence of heat treatment on microstructure and mechanical properties of high chromium white cast iron alloyed with titanium was. Highchromium irons almost dont concede in fluidity to regular gray cast iron that allows using parts sufficiently difficult form. A novel process for the extraction of iron, titanium, vanadium, and chromium from highchromium vanadiumbearing titanomagnetite concentrates is proposed. Pdf microstructure and properties of high chromium cast. High chromium cast iron samples were prepared and melted in a magnesia crucible in an electric resistance furnace that can be rapidly heated up to temperature. The influence of heat treatment on microstructure and mechanical properties of high chromium white cast iron alloyed with titanium was investigated.
The structure of high chrome white iron is made up of martensite, with carbides that are formed during solidification via precipitation from the liquid metal while a eutectic reaction is taking place. On the comparison of microstructure characteristics and. Pdf the article presents results of heat treatment on the high chromium cast iron. Development of wear resistant highchromium cast iron carbon fecr development of the chromium cast iron was grounded in the system of 1822 wt. The role of retained austenite on the performance of high. However, these high chromium irons have a white iron structure.
The present invention relates to the heat treating method of a kind of highchromium wearresistant white cast iron cr28, be specifically related to a kind of highchromium wearresistant white cast iron cr28 heat treating method in working life that improves. Steel castings handbook supplement 7 welding of high alloy. Wear resistance of high chromium white cast iron for coal. Research article heat treatment in high chromium white. It also has excellent growth and scaling resistance under oxidising conditions. The present invention relates to the heat treating method of a kind of high chromium wearresistant white cast iron cr28, be specifically related to a kind of high chromium wearresistant white cast iron cr28 heat treating method in working life that improves. The heat treating method of a kind of high chromium wearresistant white cast iron cr28. Grain boundary diffusion of fe in high purity iron 1026 1024 1022 1020 1018 1016 0. Hightemperature erosion high chromium white cast iron cr contents type of carbide a b s t r a c t this present study investigated effect of chromium content on high temperature erosive.
Hc28 alloy is particularly well suited for slurry pump parts and pipe fittings in coal prep operations and coal fired power stations. Generally immediately available in most volumes, ae alloys are available as bar, ingot, ribbon, wire, shot, sheet, and foil. Pdf casting process design and wear properties of a high. Alloy data sheet high chrome white iron 25% penticton. Microstructure of vanadium, niobium and titaniumalloyed. Abrasion resistance of ascast highchromium cast iron in. Pdf abrasive wear behavior of high chromium cast iron. High temperature corrosion behaviour of iron aluminides. Research article heat treatment in high chromium white cast.
The highchrome wearresistant cast iron material is prepared from iron as a main raw material, and carbon, silicon, manganese, sulphur, phosphorus, chrome, molybdenum, nickel and copper as auxiliary materials in manners of melting and casting after preparation. Microstructure and erosioncorrosion behaviour of ascast high chromium white irons containing molybdenum in aqueous sulfuricacid slurry was studied. The invention discloses a high chrome wearresistant cast iron material and a heat treatment method. In this context, the properties of this alloy, containing 22% chromium and 3% carbon, were investigated after applying different heat treatments and. This specification covers the standard for ironchromiumnickel, highalloy tubes made by the centrifugal casting process intended for use under pressure at high temperatures. Standard specification for centrifugally cast iron. Separate part of paper was devoted to discuss the bimetallic castings with chromium cast iron layer as well as typical applications of chromium cast iron castings in minig, proccesing, metallurgical and power industry. Highchromium 2234 per cent cast iron alloys and their. Due to their excellent wear resistance in aggressive environments, high chromium cast irons hccis are widely used in industrial applications. Investigation of the wear resistance of high chromium.
Highchromium white cast iron is a material highly used in mining and drilling shafts for oil extraction, due to its high wear resistance. The typical chemical requirements of various grades and class of alloys castings available in the market are given in table 172. Pdf heat treatment in high chromium white cast iron ti. Steel castings handbook supplement 7 welding of high alloy castings. The 25% cr alloy is the most common high chrome white iron poured at penticton foundry. Highchromium cast iron an overview sciencedirect topics. When a martensitic white iron is desired for superior abrasion resistance, additions of 0. High chromium white cast irons are ferrous alloys containing 1% cr and 1. High chromium iron is recommended for applications which involve both corrosion and abrasion. High chromium white irons are ferrous based with the main alloying additions being 15 wt% chromium and 1.
Analysis of the high chromium cast iron microstructure after. Wear resistance of high chromium white cast iron for coal grinding. Abrasive wear behavior of high chromium cast iron and hadfield steela comparison. However, machining of these alloys is very difficult.
D gb m 3 s1 grain boundary diffusion in high purity iron the magnetic influence was observed for the first time grain boundary diffusion in high purity iron the. Since a high chromium content is essential to maximum corrosion resistance, any area that has been depleted. Improvement of abrasive wear resistance of the high chromium cast. The tubing shall be supplied in the as cast condition or as cast with machining on the outside or inside surfaces. The alloys investigated were hypereutectic and hypoeutectic high chromium white iron castings, a hypereutectic high. Some researchers studied white cast iron alloys with high chromium and the addition of niobium for wear plates manufacturing and therefore, plates to protect structural parts of the equipment have been developed. Microstructure and wear resistance of high chromium cast iron. Even though they have good strength properties, they also have limited machinability.
Mathematical analysis permits quantitative and qualitative assessment of the phase composition of alloys. Microstructural modifications of ascast highchromium. The average grade of the metallurgical chromite ore was 43. In the present work, additions of 2% vanadium, 2% niobium and 2% titanium were respectively made to a high chromium white iron 17% cr to analyse the effect of these elements on the ascast structure of the alloy, and their influence on the materials hardness. Microstructural characteristics and mechanical properties of. The highchromium cast irons respond to heat treatment when the carbon and chromium contents are appropriately adjusted.
Part 1 machining high chromium cast iron and the cutting tools selection. Investigation of the wear resistance of high chromium white irons. The silicon element decreases the hardenability of the highcr white cast iron. His research interests mainly focus on abrasion metallic materials and metal matrix composites, special functional metallic materials, tribological research and biomedical materials.
The microstructure of this high chromium iron was studied using metallurgical optical microscopy om and compared to the hadfield steel. Cn104195420a highchrome wearresistant cast iron material. High chromium cast iron samples with varying cr contents approximately. High chromium white irons, astm a532 are considered not weldable. Highchromium white cast irons are ferrous alloys containing 1% cr and 1. Highchromium irons almost dont concede in fluidity to regular gray cast iron that allows using parts sufficiently difficult form directly after casting without the following machining. Iijima 3 grain boundary diffusion of iron, cobalt and chromium in high purity iron. Analysis of the high chromium cast iron microstructure. Their exceptional wear resistance is the result of their high carbide content, which forms along with austenite during solidification as a proeutectic or eutectic phase depending on alloy composition, and particularly depending upon carbon and chromium content.
A novel method to extract iron, titanium, vanadium, and. High chromium cast irons hccis are alloys containing 1530 wt. The invention discloses a highchrome wearresistant cast iron material and a heat treatment method. Microstructure and properties of high chromium cast irons. High chromium white cast iron alloy used in coal grinding components is a material that may present different wear resistance depending on the thermal treatment used in its manufacturing. One school of thought is that retained austenite improves the performance through work hardening and transformation to martensite.
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