Influence of the microstructure of higher carbon steels on fracture mechanics properties | Zendy

Gasterich HansJörg | Zendy; Hagedorn Karl Edgar | Zendy; Kaspar Radko | Zendy; Pawelski Oskar | Zendy

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Influence of the microstructure of higher carbon steels on fracture mechanics properties

Author(s) -

Gasterich HansJörg,

Hagedorn Karl Edgar,

Kaspar Radko,

Pawelski Oskar

Publication year - 1993

Publication title -

steel research

Language(s) - English

Resource type - Journals

eISSN - 1869-344X

pISSN - 0177-4832

DOI - 10.1002/srin.199301046

Subject(s) - pearlite , microstructure , materials science , metallurgy , fracture (geology) , deformation (meteorology) , continuous cooling transformation , composite material , bainite , austenite

By varying the cooling rate in the region of the γ‐α‐transformation different parameters of pearlite microstructure, such as interlamellar spacing and pearlite colony size, were adjusted in a pearlitic steel with 0.79% C. Refinement of the microstructure improved the mechanical properties and the fracture mechanical properties, expressed by the J R ‐curve. Partial spheroidization of pearlite was achieved by deformation just after the pearlite formation (at the deformation temperature of 600°C). Investigations on ferritic‐pearlitic steels with 0.19, 0.35 and 0.45% C, thermomechanically treated in such a way, showed a significant influence of the change in pearlite morphology on the fracture properties, especially with a pearlite fraction larger than about 80%.

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