International Symposium on the Science and Processing of Cast Iron (SPCI XIII)
06/2024
Foundry technologies, Foundry Technologies, R&D+i, Iron foundry, Jacques Lacaze, Jon Sertucha, R&D+i, Rodolfo González-Martínez
Spheroidal graphite cast irons can be susceptible to intermediate temperature embrittlement at temperatures between 350°C and 500°C. It has been reported that the corresponding loss of ductility increases with the sulphur and magnesium content of the alloy, but can be eliminated by a sufficiently low ratio of magnesium to phosphorus content.
Using a low-sulphur, low-phosphorus alloy, previous work clarified the role of magnesium and suggested that small MgO precipitates developing at grain boundaries due to diffusion of oxygen from the atmosphere contributed to the generation of brittleness. The present work aimed to clarify how the addition of phosphorus could effect this process and make spheroidal graphite cast irons immune to brittleness at intermediate temperatures.
Rodolfo González-Martínez (AZTERLAN), Jon Sertucha (AZTERLAN), Jacques Lacaze (CIRIMAT).
High silicon, iron foundry, spheroidal cast iron, intermediate temperature embrittlement, magnesium, phosphorus.
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