Optimization of heat treatment and composition improves fatigue performance in Astaloy CrS, suggesting it rivals Mo-prealloyed PM steels.
Astaloy® CrS is a sustainable alternative to Fe-Cu-C PM steels that can also be heat treated in a conventional way with gas carburization and oil quenching. When heat treated this material has the potential to reach performance levels of Mo-prealloyed PM steels. To achieve improved fatigue performances, the evaluation was performed in two stages. First by varying the heat treatment parameters such as carburisation temperature and holding time. Secondly, Ni and graphite amounts were varied, applying carburisation at low temperature, to realise the full potential of this material. The performance was benchmarked against other materials. By optimising heat treatment and mix compositions, fatigue performance has significantly improved, making Astaloy CrS superior to Fe-Cu-C and equivalent to that of Mo-prealloyed PM steels.
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Sundaram et al. (2025) studied this question.
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