Title: PROPERTIES OF ALLOYS OF THE TERNARY SYSTEM: NICKEL-CHROMIUM-TUNGSTEN
Abstract: The electrical resistance, hardness, and high-temperature hardness of 32 alloys with a constant tungsten content of 5, 10, 20, and 30% and with a variable chromium content of 2, different heat treatments. Two sets of samples of each composition were annealed in vacuum at 1200 tained C for 24 hours and then at 1000 tained C for 100 hours. Then, one set of samples was quenched and the other set was further annealed at 800 tained C for an additional 100 hours and cooled in the furnace. It was shown that the specific electrical resistance of the alloy increases with increasing chromium content and attains a maximum in the regions where the ternary solid solution is saturated with respect to chromium and tungsten. Thus, the specific electrical resistance of the quenched, 5% tungsten alloy shows a maximum at a 35% chromium, while the annealed, 5% tungsten alloy shows a maximum at a 30% chromium. The electrical resistance of the quenched and annealed samples indicates that the solubilities of chromium and tungsten in the ternary solid solution of nickel vary with temperature. Tungsten is more effective than chromium in improving the hardness of the alloy both at room temperature and atmore » elevated temperatures. An increase in tangsten content of only 7 at.% with a constant chromium content of 9 at.% results in an increase of the hardness of the alloy of 24% at room temperature (from 162 to 201 kg/mm/sup 2/). At a constant chromium content of 15% an increase in tungsten content results in an increase of hardness at moderate temperatures as compared with an alloy with a lower tungsten content. In addition the decrease in hardness at elevated temperatures is significantly smaller for alloys with a higher tungsten content. Thus, the hardness of an alloy with 5% tungsten and 25% chromium decreases by 24.7% on increasing the temperature from 100 to 500 tained C (from 190 to 143 kg/mm/sup 2/). Ge increasing the tungsten content to 10%, the decrease in hardness is 22.9% (from 231 to 180 kg/min/sup 2/). At 20% tangsten the decrease is 17.4% (230 to 190 kg/ mm/sup 2/), and at 30% tungsten the decrease in hardness is only 9% (274 to 250 kg/mm/sup 2/). Hardness values were determined at a loading of 10 kg. These data indicate the important role that tunsten plays in increasing the high- temperature hardness of alloys. (TTT)« less
Publication Year: 1960
Publication Date: 1960-02-01
Language: en
Type: article
Access and Citation
AI Researcher Chatbot
Get quick answers to your questions about the article from our AI researcher chatbot