Effect of austenitizing temperature on friction and wear properties of austempered ductile iron

doi:10.13251/j.issn.0254-6051.2023.11.023

Abstract

Abstract: Austenitization treatment is a crucial step in obtaining high-performance austempered ductile iron (ADI). Through austenitization treatment, the cast iron matrix structure transforms into austenite, providing a precursor for the subsequent austempering process during which austenite transforms into ausferrite. The austenitization temperature was controlled, and the corresponding changes in ADI's microstructure and their effects on mechanical properties and friction-wear properties were investigated. The research reveals that the increase of austenitization temperature can enhance the carburizing effect of carbon diffusion from graphite to the matrix, resulting in higher carbon content and improved stability in austenite. On one hand, this leads to decreased nucleation driving force of ferrite in the cooling transformation process, resulting in a finer elongated ferrite morphology in the austenite-ferrite structure. On the other hand, it leads to an increase in the volume of blocky retained austenite and carbon content, resulting in a decrease in strength, hardness and elongation after fracture. Higher austenitization temperatures result in the ADI containing a significant amount of high-carbon retained austenite, making it challenging for stress-induced phase transformation to form martensite during friction-wear processes, and thus reducing wear resistance. Considering mechanical and friction-wear properties, the austenitization temperature for the ADI should not exceed 950 ℃.

Key words: austempered ductile iron (ADI), austenitizing temperature, austenite, friction and wear behavior, wear mechanism

CLC Number:

TG163

Du Baoshuai, Mi Chunxu, Wang Xin, Yang Chao, Yang Xinyu, Yan Zhicheng. Effect of austenitizing temperature on friction and wear properties of austempered ductile iron[J]. Heat Treatment of Metals, 2023, 48(11): 149-155.

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