The Microstructural Effects on Tensile Properties and Erosion Wear Resistance in Upper Bainitic ADI Related to Variation in Silicon Content

Abstract

The Effects of austempering duration and silicon content on the particle erosion wear resistance of high strength upper bainitic ADI were characterized. The results showed that the amount of retained austenite dominantly affects tensile strength and variation of wear resistance. For a sample with higher silicon content, the austempering duration should be prolonged to ensure complete bainitic transformation. In addition, a tiny increase in carbide formation can certainly play an important role in debasing tensile strength and erosion wear resistance. This results in an alternation in erosion behavior. However, hardness cannot be correlated to wear resistance. Erosion-induced phase transformation of retained austenite phase will eventually produce ε-carbide, which thus promotes the erosion wear rate.

Effect of Austempering Duration on Erosion Wear Resistance of ADI by Al<SUB>2</SUB>O<SUB>3</SUB> Particle

“…In addition, using single-shot high-speed photography, the average particle velocity was estimated as 73 m s À1 . 2,6) The mass loss caused during the erosion test was measured using a microbalance of 0.01 mg accuracy. Before weighing, the specimens were ultrasonically cleaned in acetone.…”

“…The effect of silicon content on the mechanical properties and erosion resistance has been clarified in many previous reports on ADI. [1][2][3][4][5][6] Therefore, the application of ADI must have controlled the silicon content and retained austenite content to improve the fracture toughness. 2) In this investigation, the erosion mechanism of Stage I and Stage II ADI with the same chemical composition by varying systematically austempering duration is required to recognize.…”

“…[1][2][3][4] Reports on the erosion wear of cast irons indicated that erosion resistance can be improved through heat treatment. [1][2][3][4][5][6] However, relatively few studies relating to the effect of austempering duration on erosion resistance of ADI regarding the investigation of Al 2 O 3 particle erosion can be found readily.…”

“…[1][2][3][4] Reports on the erosion wear of cast irons indicated that erosion resistance can be improved through heat treatment. [1][2][3][4][5][6] However, relatively few studies relating to the effect of austempering duration on erosion resistance of ADI regarding the investigation of Al 2 O 3 particle erosion can be found readily. 1,2,6) Generally, increasing the silicon content in ADI at the given temperature and austempering duration will increase the amount of retained austenite and suppress the carbide formation.…”