Roles of precipitates on corrosion fatigue crack growth of high-strength steels in corrosive environments

• Published in: Journal of materials science Vol. 24; no. 2; pp. 693 - 697
• Main Author: HAMANO, R
• Format: Journal Article
• Language: English
• Published: Heidelberg Springer 01-02-1989
• Subjects: Applied sciences; Corrosion; Corrosion mechanisms; Cross-disciplinary physics: materials science; rheology; Exact sciences and technology; Materials science; Metals, semimetals and alloys; Metals. Metallurgy; Physics; Specific materials; Scanning electron microscopy; Growth rate; Growth; Incoherent precipitate; High strength steel; Coherent precipitate; Experimental study; Sodium chloride; Low alloy steel; Corrosion fatigue; Fatigue crack; Crack propagation; Cathodic polarization; Fatigue test; Fracture appearance; Microstructure
• ISSN: 0022-2461; 1573-4803
• DOI: 10.1007/BF01107461

The effect of microstructures on resistance to corrosion fatigue cracking and fracture surface morphology for age-hardened steels were investigated in a 3.5% NaCl aqueous solution under a cathodic potential of -0.85 V (Ag/AgCl). The free corrosion was about -0.63 V (Ag/AgCl). The resistance to corrosion fatigue cracking of materials containing coherent precipitates in the matrix (underaged conditions) was less than that of materials containing incoherent precipitates (reheated conditions) at equal strength levels. Accelerated fatigue crack growth rates of the underaged material in the aqueous solution were followed by cracking along prior-austenite grain boundaries.