KIC AND (W/A) FRACTURE TOUGHNESS PROPERTIES OF AFC-77 STAINLESS STEEL
Technical rept. Jan 1965-Jan 1966
AIR FORCE MATERIALS LAB WRIGHT-PATTERSON AFB OH
Pagination or Media Count:
The fracture toughness of AFC-77, a high strength stainless steel alloy, was determined with the center notch and single edge notch fracture toughness specimens at room temperature as a function of six tempering temperatures 400 deg F, 700 deg F, 800 deg F, 900 deg F, 1000 deg F, and 1100 deg F. Tempering temperatures above 700 deg F produced poor values of plane strain fracture toughness. In addition the precracked charpy specimen was used to determine, for each tempering temperature, the test temperature at which transition from relatively tough to relatively brittle behavior occurred. The optimum properties of AFC-77 were obtained at the 700 deg F temper. This was evident as a result of the analysis of the room temperature notch, single edge notch and precrack charpy test results. The optimum room temperature properties were 182 KSI yield strength and 65 KSI sq root in plane strain fracture toughness.
- Metallurgy and Metallography