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

Journal Article · Sun Nov 01 00:00:00 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), Vol. 20:4
• Country of Publication: United States
• Language: English

Related Subjects

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