4.7 Article

Austempered Compacted Graphite Iron - Influence of austempering temperature and time on microstructural and mechanical properties

Publisher

ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2019.138434

Keywords

Austenitising; Austempered CGI; Ausferrite matrix; Retained austenite; Mechanical properties; EBSD

Funding

  1. Stiftelsen for kunskaps- och kompetensutveckling (KK-Foundation), Sweden under the ProSpekt scheme [GNR. 20170021]

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This study investigates the effect of austempering temperature and time on the microstructural and mechanical properties of unalloyed Compacted Graphite Iron (CGI) with an initially ferritic matrix structure. The as-cast CGI samples were first austenitised at 900 degrees C for 60 min in a furnace, then austempered in a closed salt bath at three austempering temperatures - 275, 325, and 375 degrees C - for different times; 30, 60, 90, and 120 min. Tensile properties, Brinell, Vickers and Rockwell C hardness values were evaluated for the as-cast and austempered CGI ones. LOM and SEM, EBSD analysis techniques were used for microstructure and phase analysis. A mixture of acicular ferrite and retained austenite was achieved in the austempered CGI samples. In general, a decrease in austempering temperature resulted in a decrease in retained austenite content, corresponding improvements in hardness and tensile strength, and a decrease in elongation values.

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