Abstract
The speed of propagation of the fatigue crack at 293 and 623~ and also the characteristics of fracture toughness under static and cyclic loading were investigated under conditions of eccentric tension of compact specimens, 25 mm thick, on a servohydraulic testing machine "Gidropul's 400 kN," the speed of FCP in the base metal, in the built-up metal, and in the heat-affected zone of steel 15Kh3NMFAA at 623~ on a servohydraulic machine S~I 100/60. The speed of FCP was determined at a loading frequency of 25 Hz (dZ/dN j 5,10 -7 m/cycle) and 5 Hz (dZ/dN > 5,10 -7 m/cycle). The fracture toughness of the metal of the welding seam 10Kh~iFT under conditions of static loading in the temperature range 93-213~ was investigated in threepoint bending of flat specimens 50 • I00 • 450 mm in size. The characteristics of crack resistance were established in accordance with the recommendations of [i, 2]. The characterisI tics of fracture toughness under cyclic loading K fc' Kkfc were determined with constant val~ and Kkfc are the critical ues of the coefficient R and the double load amplitude. Here, K fc stress intenskty factors (SIF) corresponding to minimal fatigue fracture toughness and dynamic fracture toughness, respectively [3, 4].
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