Effect of corrosive medium on fatigue crack growth behaviour and fracture in high martensite dual phase steel |
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| Authors: | K V Sudhakar Asim Bag E S Dwarakadasa K K Ray |
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| Affiliation: | (1) Department of Metallurgy, Indian Institute of Science, 560 012 Bangalore, India;(2) Department of Construction Engineering, Materials Engineering and Industrial Design, Western Michigan University, 49008 Kalamazoo, MI, USA;(3) School of Mechanical and Production Engineering, Nanyang Technological University, 639 798 Singapore;(4) Department of Materials and Metallurgical Engineering, Indian Institute of Technology, 721 302 Kharagpur, India |
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| Abstract: | Fatigue crack growth (FCG) behaviour in both near-threshold and higher stress intensity range (ΔK) in intercritically annealed dual-phase (DP) steel containing martensite between 32% and 76% in ferrite has been studied in 3·5% NaCl solution. It is shown that the amount of martensite content in dual phase steel has a significant effect on threshold (ΔK th) values and FCG rates. Higher content of martensite in ferrite leads to higher threshold values and lower FCG rates. Further, ΔK th is much higher in 3·5% NaCl solution as compared to that in laboratory air. Fractography studies reveal that in the near-threshold region, fracture surfaces are characterized mainly by intergranular cracking in corrosive (3·5% NaCl solution) environment. Higher threshold values in 3·5% NaCl solution is attributed to the higher crack closure induced by rougher fracture surface and by the strong wedge effects of corrosion products. |
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| Keywords: | DP steel intercritical annealing fatigue crack growth fracture toughness corrosive medium SEM |
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