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A Study of Fatigue Crack Growth Behaviour for Ferrite-Bainite Dual Phase Steel
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  • Journal title : Journal of Welding and Joining
  • Volume 34, Issue 1,  2016, pp.41-46
  • Publisher : The Korean Welding and Joining Society
  • DOI : 10.5781/JWJ.2016.34.1.41
 Title & Authors
A Study of Fatigue Crack Growth Behaviour for Ferrite-Bainite Dual Phase Steel
Kim, Deok-Geun; Cho, Dong-Pil; Oh, Dong-Jin; Kim, Myung-Hyun;
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With the recent increase in size of ships and offshore structures, there are more demand for thicker plates. As the thickness increases, it is known that fatigue life of the structures decrease. To improve the fatigue life, post weld treatments techniques, such as toe grinding, TIG dressing and hammer peening, are typically employed. However, these techniques require additional construction time and production cost. Therefore, it is of crucial interest steels with longer fatigue crack growth life compared to conventional steels. This study investigates fatigue crack growth rate (FCGR) behaviours of conventional EH36 steel and Ferrite-Bainite dual phase EH36 steel (F-B steel). F-B steel is known to have improved fatigue performance associated with the existence of two different phases. Ferrite-Bainite dual phase microstructures are obtained by special thermo mechanical control process (TMCP). FCGR behaviours are investigated by a series of constant stress-controlled FCGR tests. Considering all test conditions (ambient, low temperature, high stress ratio), it is shown that FCGR of F-B steel is slower than that of conventional EH36 steel. From the tensile tests and impact tests, F-B steel exhibits higher values of strength and impact energy leading to slower FCGR.
Fatigue crack growth rate;Dual phase steel;Ferrite-Bainite;
 Cited by
Wen Jie Xin, Dong Jin Oh and Myung Hyum Kim, A Approach for Fillet Welded Joints, Journal of KWJS, 32-2 (2014), 37-42 (in Korean)

Sung Won Kang, Myung Hyun Kim, Jae Young Choi, Wha Soo Kim and Young Min Paik, A Study on the Fatigue Strength Improvement using Weld Toe Burr Grinding, Journal of KWJS, 24-2 (2006), 42-47 (in Korean)

Seung Yong Lee and Kab Soo Kyung, A Study on the Fatigue Strength Improvement of the Fillet Welded Connections with respect to Post-Weld Treatment, KSCE Journal of Civil Engineering, 28-5A (2008), 665-672 (in Korean)

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