38MnSiVS5 steel is similar to 38MnVS6 steel (EN), the difference being the addition of a small Ti content. Typical Ti and Al contents in the chemical composition of 38MnSiVS5 steel are Ti=0.020 and Al=0.035 mass%. Both elements combine easily with nitrogen, especially Ti, and it has been observed that relatively high Al levels are harmful for austenite grain size control at reheating temperatures. In this work 38MnSiVS5 steel is used to manufacture a large number of castings, varying only the Ti and Al contents and obtaining ingots with a different Ti/Al ratio in each case. The results show that abnormal growth of the austenitic grain occurs irrespective of the Ti and Al contents, due fundamentally to the partial dissolution and coarsening of TiN precipitates. However, the steels with high Al contents present worse behaviour due to the formation of a second type of precipitates, namely AlN, which quickly dissolve between 1000 and 1100 deg C, causing a drastic decline in local pinning forces that gives rise to more pronounced abnormal growth of the affected grains.
Ti/Al interaction and austenite grain control in cranckshaft manufacturing with 38MnSiVS5 steel
Ti/Al-Wechselwirkung und die Austenitskornregelung beim Stahl 38MnSiVS5 im Kurbelwellenbau
Steel Research International ; 77 , 9/10 ; 712-719
2006
8 Seiten, 20 Bilder, 3 Tabellen, 23 Quellen
Article (Journal)
English
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