Analysis of the High Chromium Cast Iron Microstructure after the Heat Treatment

Abstract

The article presents results of heat treatment on the high chromium cast iron. The study was carrying out on samples cut from the casting made from chromium cast iron. Those were hardened at different temperatures, then tempered and soft annealed. The heat treatment was performed in a laboratory chamber furnace in the Department of Engineering Alloys and Composites at Faculty of Foundry Engineering AGH. At each stage of the heat treatment the hardness was measured by Vickers and Rockwell methods, and the microscope images were done. Additionally based on images from the optical microscope the microstructure was assessed. Based on these results, the effect of hardening, tempering and soft annealing on the microstructure and hardness of high chromium cast iron was studied. Next the effects of different hardening temperatures on the properties of high chromium cast iron were compared. The study led to systemize the literature 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.

High Chromium Cast Irons: Destabilized-Subcritical Secondary Carbide Precipitation and Its Effect on Hardness and Wear Properties

“…The wear resistance and mechanical properties, especially the hardness, of HCCI depend on the type, morphology and distribution of carbides, and on the nature of the supporting matrix structure which, in turn, depends on the chemical composition and on any subsequent thermal treatments [14][15][16]. The secondary carbides, may increase the wear resistance of the matrix itself, providing load support and reducing damage by third bodies scratching the surface, by the same mechanisms that has been studied carefully -4 -with more conventional, low reinforcement volume fraction, composite materials [17,18].…”

Pengaruh Variasi Holding Temperature dan Holding Time Pada Post Weld Heat Treatment Terhadap Struktur Mikro dan Distribusi Kekerasan Hasil Pengelasan Bisclad 600 dengan Metode SMAW di PT. Holcim Indonesia

“…Bentuk ini akan menambah kekerasan pada logam. [5]. Kekerasan pada waktu tahan 3 jam menunjukkan penurunan kekerasan pada kedua waktu pemanasan.…”

Abrasion Wear Behavior of High-chromium Cast Iron

“…Wear resistance and mechanical properties of high-chromium cast irons depend on a type, shape and number of carbides being found in their microstructure, on matrix's characteristics within which carbides are embedded, and on the strength of the matrixcarbide bonding [1,3,4,6,7]. Increasing both the carbon and chromium contents increases the amount of carbides.…”

“…The gained results have indicated that to use them more extensively there is desired to deal with several problems such as an effect of microalloying and inoculation of molten metal [1,2,3], possibility to modify the utility properties of material using a heat treatment [1,4], and the method of hardening of the iron's matrix under the local plastic strain [1,5].…”