Dilatometry; Electron Microscopy; Internal Damage; Mechanical Characterization; Strengthening Mechanism; Tool Steel; LiMaRC - Liège Materials Research Center; CAREµ
Abstract :
[en] The mechanical behavior of the fully austenitic matrix of high-chromium cast steel (HCCS) alloy is
determined by external compression stress applied at 300 and 700 C. The microstructure is roughly
characterized toward both optical and scanning electron microscopy analyses. Dilatometry is used during
heating from room temperature up to austenitization to study the solid-state phase transformations, precipitation,
and dissolution reactions. Two various strengthening phenomena (precipitation hardening and
stress-induced bainite transformation) and one softening mechanism (dynamic recovery) are highlighted
from compression tests. The influence of the temperature and the carbide type on the mechanical behavior
of the HCCS material is also enhanced. Cracks observed on grain boundary primary carbides allow
establishing a rough damage model. The crack initiation within the HCCS alloy is strongly dependent on
the temperature, the externally applied stress, and the matrix strength and composition.
Disciplines :
Materials science & engineering
Author, co-author :
Tchuindjang, Jérôme Tchoufack ; Université de Liège - ULiège > Département d'aérospatiale et mécanique > Science des matériaux métalliques
Neira Torres, Ingrid; Universidad de Concepción, Chile > Department of Materials Engineering
Fores, Paulo; Universidad de Concepción, Chile > Department of Mechanical Engineering
Habraken, Anne ; Université de Liège - ULiège > Département ArGEnCo > Département ArGEnCo
Lecomte-Beckers, Jacqueline ; Université de Liège - ULiège > Département d'aérospatiale et mécanique > Science des matériaux métalliques
Language :
English
Title :
Phase Transformations and Crack Initiation in a High-Chromium Cast Steel Under Hot Compression Tests
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