Thermal degradation of pearlitic steels: influence on mechanical properties including fatigue behaviour

• With the aim to predict the durability of railway wheels, thermomechanical damage was studiedfor two steels with different alloying levels of silicon and manganese in the temperature range of500–725uC. Softening caused by cementite spheroidisation in pearlite leads to changes in themechanical behaviour and an accompanying decrease in fatigue lifetimes. It was found thathigher contents of Si and Mn lead to better resistance to softening of both virgin and plasticallydeformed material. Correspondingly, the high Si–Mn alloyed steel loses much less in fatiguelifetime than the lower alloyed steel.

Ämnesord

TEKNIK OCH TEKNOLOGIER  -- Materialteknik -- Annan materialteknik (hsv//swe)

ENGINEERING AND TECHNOLOGY  -- Materials Engineering -- Other Materials Engineering (hsv//eng)

Nyckelord

Fe–Si–Mn

Deformation

Spheroidisation

Annealing

Low cycle fatigue

Railway

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