The present study investigates the fracture toughness of FSW X80 HSLA steel welds. Weld cooling rate and peak temperature were varied among welds; indirectly manipulated through travel speed, rpm, weld preheat. Fracture was tested according to ASTM 1820 standard along centerline using surface-notched SEB specimen cooled −40 °C. Results demonstrate that CTOD has a strong inverse linear correlati...

The fracture behavior of a high-strength low-alloy steel subjected to tempforming at 873 K, 923 or 973 K was studied by means impact and bending tests. A decrease in temperature promoted the grain refinement resulting ultrafine grained lamellar-type microstructure with finely dispersed particles that led significant strengthening along an increase toughness. tempformed samples exhibited Charpy ...