EFFECT OF STRAIN RATE ON MECHANICAL PROPERTIES OF WROUGHT SINTERED TUNGSTEN AT TEMPERATURES ABOVE 2500 F
Abstract
Specimens of wrought sintered commercially pure W were made from 1/8-in. swaged rods. All the specimens were recrystallized at 4050 F for 1 hr prior to testing at temperatures from 2500 to 4000 F at various strain rates from 0.002 to 20 in. per in. per minute. Results showed that, at a constant temperature, increasing the strain rate increased the ultimate tensile strength significantly. The effects of both strain rate and temperature on the ultimate tensile strength of W may be correlated by the lineught sintered commercially pure W were made from 1/8-in. swaged rods. All the specimens were recrystallized at 4050 F fr parameter method of Manson and Haferd and may be used to predict the ultimate tensile strength at higher temperatures, 4500 and 5000 F. As previously reported, ductility, as measured by reduction of area in a tensile test, decreases with increasing temperature above about 3000 F. Increasing the strain rate at temperatures above 3000 F increases the ductility. Fractures are generally tra sgranular at the higher strain rates and intergranular at the lower strain rates. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 01, 1961
- Accession Number
- AD0265482
Entities
People
- Paul F. Sikora
- Robert W. Hall
Organizations
- National Aeronautics and Space Administration