ISSN:
1573-9066
Source:
Springer Online Journal Archives 1860-2000
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Conclusions 1. An electron microscopical investigation of the microstructure of chromium carbide hard alloys with nickel and nickel-phosphorus binders has shown that the addition of phosphorus (in amounts of not less than 0.1 wt.%) leads to the appearance in the structure of these alloys of areas within which the carbide grains are almost completely separated from one another by interlayers of the cementing phase. 2. It is demonstrated that fracture of both phosphorus-free chromium carbide hard alloys and alloys containing up to 0.6 wt.% of phosphorus has a dual character, varying from intergranular rupture at low sintering temperatures (up to 1220°C) to predominantly transgranular carbide grain cleavage at higher sintering temperatures. KKhNF-15 alloys containing 1.65 wt.% of phosphorus fracture, irrespective of the temperature at which they were sintered, along their phase and grain boundaries. The highest transverse rupture strength is exhibited by alloys with 0.1 wt.% of phosphorus sintered at 1270°C.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00790984
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