Embrittlement of austempered nodular irons: Grain boundary phosphorus enrichment resulting from precipitate decomposition
Document Type
Article
Publication Date
5-1985
Department
Department of Materials Science and Engineering
Abstract
The microstructures, mechanical properties, and fracture behavior were characterized for a series of Mg treated nodular cast iron specimens austenitized at 1170, 1255, and 1340 K and subsequently austempered at 640 K. The ductility and toughness of the alloy decreased as austenitization temperatures were increased, which is contrary to the behavior anticipated from the observed micro-structural evolution. Fractographic and surface chemical analyses demonstrated that the mechanical property degradation was associated with embrittlement of the austenite grain boundaries by phosphorus. The primary mechanism of grain boundary phosphorus enrichment does not appear to be equilibrium segregation, and an alternative mechanism based on the decomposition of P rich precipitates is proposed and discussed.
Publication Title
Metallurgical Transactions A
Recommended Citation
Klug, R.,
Hintz, M.,
&
Rundman, K.
(1985).
Embrittlement of austempered nodular irons: Grain boundary phosphorus enrichment resulting from precipitate decomposition.
Metallurgical Transactions A,
16(5), 797-805.
http://doi.org/10.1007/BF02814830
Retrieved from: https://digitalcommons.mtu.edu/michigantech-p/4522
