Microstructural and mechanical evaluation of a cr-mo-v cold-work tool steel produced via electron beam melting (Ebm)Show others and affiliations
2021 (English)In: Materials, E-ISSN 1996-1944, Vol. 14, no 11, article id 2963
Article in journal (Refereed) Published
Abstract [en]
In this work, a highly alloyed cold work tool steel, Uddeholm Vanadis 4 Extra, was manufactured via the electron beam melting (EBM) technique. The corresponding material microstructure and carbide precipitation behavior as well as the microstructural changes after heat treatment were characterized, and key mechanical properties were investigated. In the as-built condition, the mi-crostructure consists of a discontinuous network of very fine primary Mo-and V-rich carbides dispersed in an auto-tempered martensite matrix together with ≈15% of retained austenite. Adjusted heat treatment procedures allowed optimizing the microstructure by the elimination of Mo-rich carbides and the precipitation of fine and different sized V-rich carbides, along with a decrease in the retained austenite content below 2%. Hardness response, compressive strength, and abrasive wear properties of the EBM-manufactured material are similar or superior to its as-HIP forged counterparts manufactured using traditional powder metallurgy route. In the material as built by EBM, an impact toughness of 16–17 J was achieved. Hot isostatic pressing (HIP) was applied in order to further increase ductility and to investigate its impact upon the microstructure and properties of the material. After HIPing with optimized protocols, the ductility increased over 20 J.
Place, publisher, year, edition, pages
2021. Vol. 14, no 11, article id 2963
Keywords [en]
Additive manufacturing, Carbides, Cold work, Electron beam melting, Hardness, Mechanical properties, Tool steel
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:miun:diva-42339DOI: 10.3390/ma14112963ISI: 000660258100001Scopus ID: 2-s2.0-85107861179OAI: oai:DiVA.org:miun-42339DiVA, id: diva2:1570749
2021-06-222021-06-222024-07-04Bibliographically approved