Corrosion fatigue behaviors of HSB800 and its HAZs in air and seawater environments

Abstract Corrosion fatigue behaviors of high-performance steel, HSB800, and its heat-affected zones (HAZs) were investigated in air and seawater environments through uniaxial tension-compression fatigue tests. Three types of material including the as-received base metal (BM), coarse-grained (CG) HAZ, and inter-critically reheated coarse-grained (ICCG) HAZ of HSB800 were used. A 3.5% sodium chloride solution was used as a seawater environment. A 600–940 MPa maximum stress was applied during the fatigue load cycles, and the minimum stress was set to zero. The test results show that the ICCG HAZ had much less fatigue resistance than the BM and CG HAZ in both air and seawater environments. The deterioration mechanisms of the corrosion fatigue behaviors based on the microstructural aspects were also discussed. In addition, an empirical model for estimating corrosion fatigue life was developed by considering the stress sensitivity of loading conditions. Subsequently, material parameters in the power-law relationship between applied stress amplitude and cycles-to-failure were characterized. The ICCG HAZ exhibited more sensitivity on the stress level of the corrosion fatigue life than on those of the BM and CG HAZ. Meanwhile, the amount of environmental degradation of fatigue life of BM from in-air to in-seawater condition was greater than the others because of its microstructure with relatively adequate potential to corrode.

[1]  KyooYoung Kim,et al.  Effect of microstructure on the hydrogen trapping efficiency and hydrogen induced cracking of linepipe steel , 2008 .

[2]  Ke Yang,et al.  In situ TEM study of the effect of M/A films at grain boundaries on crack propagation in an ultra-fine acicular ferrite pipeline steel , 2006 .

[3]  M. Kikuchi,et al.  Fatigue crack growth behavior of weld heat-affected zone of type 304 stainless steel in high temperature water , 1994 .

[4]  Z. Ahmad.  Principles of Corrosion Engineering and Corrosion Control , 2006 .

[5]  D. Kwon,et al.  Effects of microstructural change on fracture characteristics in coarse-grained heat-affected zones of QLT-processed 9% Ni steel , 2003 .

[6]  Toshihiro Shimizu,et al.  Fatigue crack propagation of 444 stainless steel welded joints in air and in 3%NaCl aqueous solution , 2006 .

[7]  Yaowu Shi,et al.  Effect of weld thermal cycle on microstructure and fracture toughness of simulated heat-affected zone for a 800 MPa grade high strength low alloy steel , 2008 .

[8]  K. Ray,et al.  Corrosion fatigue crack growth behaviour of naval steels , 2006 .

[9]  Tae-won Kim,et al.  Corrosion fatigue crack propagation in a heat affected zone of high-performance steel in an underwater sea environment , 2011 .

[10]  Changhee Lee,et al.  Fatigue crack growth behavior of the simulated HAZ of 800 MPa grade high-performance steel , 2011 .

[11]  T. Kosonen,et al.  Corrosion fatigue of weld‐bonded austenitic stainless steels in 3.5% NaCl solution , 2006 .

[12]  K. Easterling.  Introduction to the physical metallurgy of welding , 1983 .

[13]  J. D. Laat,et al.  Effects of chloride ions on the iron(III)-catalyzed decomposition of hydrogen peroxide and on the efficiency of the Fenton-like oxidation process , 2006 .