Corrosion Wear of Hypereutectic High Chromium Cast Iron: A Review

Abstract

Hypereutectic High Chromium Cast Iron (HHCCI) is a new type of corrosion-wear-resistant material developed from ordinary high chromium cast iron by increasing the chromium and carbon content and is often used in abrasive environments where wear and corrosion interact. The corrosion wear resistance of the HHCCI is related to the number, size, shape and distribution of carbides and the microstructure of the matrix. This paper reviews the research progress in improving the corrosion wear resistance of HHCCI from various aspects such as primary carbide refinement, heat treatment, deep cooling treatment and alloying, etc. Among the methods of refining primary carbides are modification, semi-solid treatment and current pulse treatment. In addition, we also analyze the potential of Cr, V, Nb, Mo, Mn, W, Ni, Cu, Si, N and other alloying elements to improve the corrosion wear resistance of HHCCI. The mechanism for improving the corrosion wear resistance of HHCCI is also explored in depth and research contents worthy of attention are proposed to further improve the corrosion wear resistance of HHCCI. In the future, the author believes that modification + alloying + heat treatment is the most potential application method to improve the corrosion wear resistance of HHCCI. The corrosion wear resistance of HHCCI can be further improved by refining the primary carbide (such as adding rare earth, Ti and other modified elements) + heat treatment (with cryogenic treatment) to improve the strength + alloying (such as adding low-cost, high-potential alloy elements such as N and Si) to improve the corrosion wear resistance of the matrix.

Microstructure and properties of hypereutectic high chromium cast iron containing nitrogen

“…11,13 When the N content is 0.3 wt.%, the corrosion current density is the lowest and the corrosion resistance is the best. After the addition of N element, N can be dissolved into the matrix, increasing the electrode potential of the matrix, and the dissolved N in the matrix consumes H + in the pores or gaps of HHCCI after acid corrosion to form NH + , which reduces the PH value of the corrosion solution, 22 thereby improving the corrosion resistance of HHCCI. When the N content increases to 0.3 wt.%, HHCCI has the highest austenite content.…”

Recent Advances in Cast Irons

“…The book collects manuscripts from cutting-edge academic researchers and consists of one review paper regarding the research progress in improving the corrosion wear resistance of a novel hypereutectic high-chromium cast iron (HCCI) [1] and eight experimental research papers focused on methods for enhancing the corrosion, mechanical and microstructural features of cast irons in general, i.e., nodular, gray, vermicular, austempered ductile iron (ADI) and HCCI [2][3][4][5][6][7][8][9].…”

“…The review by Gong et al [1] provides a detailed analysis of the development and research progress in improving the corrosion wear resistance of a novel hypereutectic HCCI, obtained by increasing its chromium and carbon contents. HCCIs are frequently used in abrasive environments where wear and corrosion can be present.…”

Effect of thermal treatment of chromium iron melts on the structure and properties of castings

“…Recently, more and more attention from researchers has been paid to the problem of how to increase the wear resistance and corrosion resistance of chromium cast irons by an increase in the proportion of carbides in them [17]. An increase in the proportion of carbides is possible in two ways, by the increase in the carbon and chromium content, and by alloying with such metals as W, Ti, V, Mo, Nb, etc In the first case, the alloy acquires a hypereutectic structure with large primary carbide crystals [18].…”