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Development of Tungsten Carbide Hardmetals Using Iron-Based Binder Alloys.

DE82750018

Publication Date	1980
Personal Author	Prakash, L. J.
Page Count	221
Abstract	The main work was carried out on hardmetals with 20 wt.% of iron rich binder alloys; the cobalt and nickel content of the alloys was varied upto 50 wt.%. The properties of the WC-Fe, WC-Co and WC-Ni hardmetals were measured for comparison. The influence of the carbon content, heat treatment and alloying with chromium andor molybdenum carbide was also evaluated. In addition to this, the effect of changes in the binder content and the carbide grain size on the properties of the hardmetals was determined. The structure of the WC-hardmetals with Fe-Co-Ni binders is similar to that of WC-Co, but the carbide grain size is somewhat smaller. The carbon content of the hardmetals has to be above the stoichiometric value of the tungsten carbide in order to obtain optimal hardmetal properties. The mechanical properties of the WC-Fe/Co/Ni hardmetals are strongly dependent on the binder composition and can be varied in a wide range. The optimal WC-Fe/Co/Ni hardmetals have at comparable transverse rupture strengths higher room temperature and hot hardness values, better fracture toughness and abrasive strength than the WC-Co hardmetals. Hardmetals whose binder is mainly martensitic have the best combination of all measured mechanical properties.
Keywords	Iron base alloys Cobalt alloys Nickel alloys Tungsten carbides Binders Quantity ratio Carbon Heat treatments Chromium carbides Molybdenum Grain size Carbides Microstructure Hardness Fracture properties Abrasion Wear resistance Martensite Powder metallurgy Density Magnetic properties Foreign technology ERDA/360200
Source Agency	TIC Foreign Exchange Reports
NTIS Subject Category	71D - Ceramics, Refractories, & Glass 71J - Iron & Iron Alloys
Corporate Authors	Kernforschungszentrum Karlsruhe G.m.b.H. (Germany, F.R.). Inst. fuer Material- und Festkoerperforschung.; Karlsruhe Univ. (TH) (Germany, F.R.). Fakultaet fuer Maschinenbau.
Supplemental Notes	In German. Thesis.
Document Type	Technical Report
NTIS Issue Number	198221

Development of Tungsten Carbide Hardmetals Using Iron-Based Binder Alloys.

Development of Tungsten Carbide Hardmetals Using Iron-Based Binder Alloys.
DE82750018

Publication Date	1980
Personal Author	Prakash, L. J.
Page Count	221
Abstract	The main work was carried out on hardmetals with 20 wt.% of iron rich binder alloys; the cobalt and nickel content of the alloys was varied upto 50 wt.%. The properties of the WC-Fe, WC-Co and WC-Ni hardmetals were measured for comparison. The influence of the carbon content, heat treatment and alloying with chromium andor molybdenum carbide was also evaluated. In addition to this, the effect of changes in the binder content and the carbide grain size on the properties of the hardmetals was determined. The structure of the WC-hardmetals with Fe-Co-Ni binders is similar to that of WC-Co, but the carbide grain size is somewhat smaller. The carbon content of the hardmetals has to be above the stoichiometric value of the tungsten carbide in order to obtain optimal hardmetal properties. The mechanical properties of the WC-Fe/Co/Ni hardmetals are strongly dependent on the binder composition and can be varied in a wide range. The optimal WC-Fe/Co/Ni hardmetals have at comparable transverse rupture strengths higher room temperature and hot hardness values, better fracture toughness and abrasive strength than the WC-Co hardmetals. Hardmetals whose binder is mainly martensitic have the best combination of all measured mechanical properties.
Keywords	Iron base alloys Cobalt alloys Nickel alloys Tungsten carbides Binders Quantity ratio Carbon Heat treatments Chromium carbides Molybdenum Grain size Carbides Microstructure Hardness Fracture properties Abrasion Wear resistance Martensite Powder metallurgy Density Magnetic properties Foreign technology ERDA/360200
Source Agency	TIC Foreign Exchange Reports
NTIS Subject Category	71D - Ceramics, Refractories, & Glass 71J - Iron & Iron Alloys
Corporate Authors	Kernforschungszentrum Karlsruhe G.m.b.H. (Germany, F.R.). Inst. fuer Material- und Festkoerperforschung.; Karlsruhe Univ. (TH) (Germany, F.R.). Fakultaet fuer Maschinenbau.
Supplemental Notes	In German. Thesis.
Document Type	Technical Report
NTIS Issue Number	198221