Researches Regarding the Influence of Alloying Elements on the Mechanical Properties of Lamellar Graphite Cast Iron

Abstract

Aim of the study is to present the technological process of obtaining cast iron with lamellar graphite for use in the manufacture of cylinder liners, and to identify the main alloying elements and track their influence on the mechanical properties of cast iron with lamellar graphite. Also paper presents analysis of 20 batches of cast iron with lamellar graphite, which are made of cylinder liners, in terms of chemical composition and the mechanical properties. After the analysis of the 20 castings of cast iron Fc 250 it is observed that: the increase in the carbon content shows a decrease of the tensile strength and hardness of the gray cast iron; the increase in silicon content shows a decrease in hardness and tensile strength. Decreasing the amount of graphite and especially the alloy of silicon iron lead to hardness increase 1% Si increases hardness by 50 HB). A statistical analysis has been performed on the data obtained that accounts for changes in alloying additions. A modeling and optimization of mechanical properties (tensile strength and hardness) was performed according to the percentages of carbon, silicon and manganese. Mathematical modeling found that the hardness and traction resistance of the cast iron decreased with the increase in carbon, silicon and manganese content.

Yüksek Silisli Lamel Grafit Dökme Demir Kamyon Fren Disklerinin Sürtünme ve Aşınma Davranışı

“…Due to the above-mentioned properties, high silicon lamellar graphite cast iron is a preferred material type, especially in heavy industry and engineering applications [12][13][14][15]. High silicon lamellar graphite cast irons are especially used in applications requiring high wear resistance [15].…”

“…This investigation is centered on the application of high silica lamellar graphite cast irons in the manufacturing of truck brake discs. The rationale behind opting for high silica lamellar graphite cast irons lies in their multifaceted advantages, including notable wear resistance, a low coefficient of friction, high-temperature resilience, effective noise control, and the ease of casting [12,13]. In terms of wear resistance, the elevated silica content in these cast irons endows them with exceptional durability, thereby mitigating the wear and tear of brake discs subjected to friction and heat during wheel or disc brake application [14,15].…”