Microstructure of Fe-Cr-C hardfacing alloys with additions of Nb, Ti and, B

Journal Article · Sun Nov 01 04:00:00 EST 1987 · Metallography; (United States)

DOI:https://doi.org/10.1016/0026-0800(87)90017-6· OSTI ID:5486323

Berns, H; Fischer, A

The abrasive wear of machine parts and tools used in the mining, earth moving, and transporting of mineral materials can be lowered by filler wire welding of hardfacing alloys. In this paper, the microstructures of Fe-Cr-C and Fe-Cr-C-Nb/Ti hardfacing alloys and deposits and those of newly developed Fe-Cr-C-B and Fe-Ti-Cr-C-B ones are described. They show up to 85 vol.% of primarily solidified coarse hard phases; i.e., Carbides of MC-, M/sub 7/C/sub 3/-, M/sub 3/C-type and Borides of MB/sub 2/-, M/sub 3/B/sub 2/-, M/sub 2/B-, M/sub 3/B-, M/sub 23/B/sub 6/-type, which are embedded in a hard eutectic. This itself consists of eutectic hard phases and a martensitic or austenitic metal matrix. The newly developed Fe-Cr-C-B alloys reach hardness values of up to 1200 HV and are harder than all purchased ones. The primary solidification of the MB/sub 2/-type phase of titanium requires such high amounts of titanium and boron that these alloys are not practical for manufacture as commercial filler wires.

• Research Organization: Institut fur Werkstoffe, Lehrstuhl Werkstofftechnik Ruhr Universitat Bochum, 4630 Bochum 1
• OSTI ID: 5486323
• Journal Information: Metallography; (United States), Journal Name: Metallography; (United States) Vol. 20:4; ISSN MEIJA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360101* -- Metals & Alloys-- Preparation & Fabrication
360102 -- Metals & Alloys-- Structure & Phase Studies
ALLOYS
BORIDES
BORON ADDITIONS
BORON ALLOYS
BORON COMPOUNDS
CARBIDES
CARBON COMPOUNDS
CHROMIUM ALLOYS
CRYSTAL STRUCTURE
EUTECTICS
HARD FACING
HARDNESS
IRON ALLOYS
MECHANICAL PROPERTIES
MICROSTRUCTURE
NIOBIUM ADDITIONS
NIOBIUM ALLOYS
PHASE TRANSFORMATIONS
QUANTITY RATIO
SOLIDIFICATION
STRUCTURAL CHEMICAL ANALYSIS
TITANIUM ADDITIONS
TITANIUM ALLOYS
WIRES