Experimental Testing and Computer Simulations of Ductile Fracture in Tool Steels
2012 (English)In: Steel Research International, ISSN 1611-3683, E-ISSN 1869-344X, Vol. 83, no 1, 91-99 p.Article in journal (Refereed) Published
Ductility was determined in experimental four-point bending tests of smooth specimens of tool steel. The tool steels had different contents of carbides and carbide sizes and with a hardness of approximately 60HRc. Two of the materials tested were produced powder metallurgically, one was spray formed and one was conventionally uphill ingot cast. Carbide size distribution analysis was performed on planar polished sections of each material. Correlation between carbide microstructure and ductility performance was obtained. The fracture mechanisms were investigated with fractography. A 3D FE-model was used to simulate the four-point bending tests and thereby analyse the matrix flow curve. Also the strain at failure was analysed for each material when simulations were performed based on experimental data. SEM-images of the materials carbide microstructure were used to create 2D FE-models. The models simulated crack initiation and propagation by removing elements in the steel matrix as the plastic strain reached a critical level. With three variants, simulations of crack initiation and propagation at carbides were investigated. That was carbides with no cohesion to matrix, carbides fixed to the matrix and carbides with internal cracks. Comparison of strains at failure for the 2D and the 3D FE-models showed good correlation.
Place, publisher, year, edition, pages
Wiley-Blackwell, 2012. Vol. 83, no 1, 91-99 p.
Tool steel, FEM, four-point bending, ductility, carbide microstructure, crack
Metallurgy and Metallic Materials
Research subject SRA - Production; SRA - Production
IdentifiersURN: urn:nbn:se:kth:diva-7941DOI: 10.1002/srin.201100220ISI: 000298743000009ScopusID: 2-s2.0-84855379629OAI: oai:DiVA.org:kth-7941DiVA: diva2:13125
FunderXPRES - Initiative for excellence in production research
QC 201202062008-01-312008-01-312016-04-26Bibliographically approved