Microstructure of the spray formed Vanadis 4 steel and its ultrafine structure

Journal Article · Thu May 15 04:00:00 EDT 2008 · Materials Characterization

DOI:https://doi.org/10.1016/j.matchar.2007.04.019· OSTI ID:21062231

Zhou, Xu ^[1]; Haisheng, Shi; Junfei, Fan ^[2]

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1. Key Laboratory for High Temperature Materials and Tests of Ministry of Education, Shanghai Jiao Tong University, Shanghai 200030 (China)
2. Shanghai Baosteel Research Institute, Shanghai 201900 (China)

The as-sprayed microstructure of the Vanadis 4 steel was studied. It was observed that the as-sprayed microstructure consists of martensite, retained austenite and uniformly distributed spheroidal carbides. The Kurdiumov-Sachs crystallographic relation between martensite and retained austenite is confirmed by transmission electron microscope. No macro segregation or network carbides are found. This can be explained in terms of the rapid solidification of spray forming for microstructure refining. The steel obtained by the new processing has a uniform carbide distribution, and the average carbide size is even smaller than the equivalent in the powder metallurgical Vanadis 4 steel. It was proved that spray forming can be considered as a new and high-efficient way to replace powder metallurgy for the production of Vanadis 4 steel.

• OSTI ID: 21062231
• Journal Information: Materials Characterization, Journal Name: Materials Characterization Journal Issue: 5 Vol. 59; ISSN 1044-5803; ISSN MACHEX
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
AUSTENITE
CARBIDES
CRYSTALLOGRAPHY
MARTENSITE
MICROSTRUCTURE
POWDER METALLURGY
REFINING
SEGREGATION
SOLIDIFICATION
SPRAYS
STEELS
TRANSMISSION ELECTRON MICROSCOPY