Analysis of thermal embrittlement of a low alloy steel weldment using fracture toughness and microstructural investigations

Lindgren, Kristina (författare): Chalmers, Microstructure Physics, Department of Physics

Thuvander, Mattias (författare): Chalmers, Microstructure Physics, Department of Physics

(creator_code:org_t)

Abstract Ämnesord

Stäng

A thermally aged low alloy steel is investigated in terms of its fracture toughness and microstructural evolution and compared to a reference. The main purpose of the study is to investigate the effects of thermal embrittlement on the brittle fracture toughness, and its effects on the influence of loss of crack tip constraint. Ageing appears to enable brittle fracture initiation from grain boundaries besides initiation from second phase particles, making the fracture toughness distribution bimodal as a result. The consequence is that the constraint effect is significantly reduced when grain boundary initiation dominates the toughness distribution, as compared to the reference material where the constraint effect is significant. The microstructure is investigated at the nano scale using atom probe tomography where nanometer sized Cu-rich clusters are found primarily situated on dislocation lines.

Av författaren/redakt...: Boåsen, Magnus; Lindgren, Kristi ...; Öberg, Martin; Thuvander, Matti ...; Faleskog, Jonas; Efsing, Pål, 196 ...

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