Author(s)

I.S. Kim, S.G. Lee & H.C. Cho

Abstract

Fatigue crack growth of SA508 C1.3 pressure vessel steel in high-temperature argon and water environments I.S. Kim, S.G Lee & H.C. Cho Korea Advanced Institute of Science and Technology, South Korea Abstract Effects of environment on the fatigue crack growth rate were studied. The hydrogen-charged SA508 C1.3 was tested at 288OC to determine the effect of hydrogen on environmentally assisted cracking (EAC) in high-temperature water. The growth rate with the H-charged specimen was enhanced by 2-3 times that of the as-received specimen under the same environment and loading conditions. Then the fracture surface revealed a striationless cleavage-like fracture showing few secondary cracks and striations. The fracture path of the enhanced crack growth was related to banitic lath boundaries. The data reflected that hydrogen in steel can actually be involved in the occurrence of the environmentally assisted cracking. 1 Introduction In a high-temperature water environment, the fatigue crack growth beh

Keywords