NOTCH SENSITIVITY OF STEELS
CASE INST OF TECH CLEVELAND OH METALS RESEARCH LAB
Pagination or Media Count:
The portion of the room-temperature notch brittleness of high-strength steels which is attributed to transition-temperature T sub tr behavior was determined. The linear dependeance of the notch strength on the notch depth at higher tempering temperatures permitted an evaluation of notch sensitivity in terms of ductility changes. Specimens of SAE-1340 steel-quenched and tempered at 600 deg, 700 deg, and 900 deg F were tested in tension over a range of temperatures in an unnotched an 6 or 10 notched condition. The notch conditions producing excessive brittle behavior 6 and 10 notches in steels tempered at 600 deg and 700 deg F exhibited T sub trs above room temperature. Specimens tempered at 900 deg F had a T sub tr curve with a knee at room temperature. An extrapolation of the super -T sub tr branch of the notched tensile ductility vs testing temperature curve to room temperature indicated that almost all of the embrittlement resulted from a shift in the T sub tr.
- Properties of Metals and Alloys