Effects of Thermal-Mechanical Processing on the Microyield Strength of Invar
AEROSPACE CORP EL SEGUNDO CA MATERIALSSCIENCES LAB
Pagination or Media Count:
Microyield strengths MYS were determined for 20- and 40-mil Invar sheet, 0.5-in.-diam rod, and 0.5-in.-diam 132 wall thickness tube using resistance strain gages. The various shapes were also characterized in terms of metallography and mechanical properties. Several heat treatments were studied for each shape. The MYS ranged from 9 to 31 ksi 62 to 214 MPa. Stretched sheet had the highest MYS. Slow furnace cooling increased the MYS of rod and tube. Stress versus plastic strain curves were characterized by the logarithmic relationship sigma K Epsilon NP. Two sets of K and n below and above the MYS were determined for sheet with 2 stretching.
- Metallurgy and Metallography
- Fabrication Metallurgy