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Comparison of the fatigue performance of ferrite–pearlite and ferrite–bainite dual-phase steels
Journal of Marine Science and Technology ( IF 2.7 ) Pub Date : 2020-06-03 , DOI: 10.1007/s00773-020-00739-0
Jeong Yeol Park , Dong Jin Oh , Myung Hyun Kim

Recent demands for large vessels and deep water exploration have increased the requirements for thicker plates to ensure the sufficient strength of such structures. The use of thicker plates, however, has an adverse influence on the fatigue performance. To enhance the fatigue life, post-weld treatments, such as weld-toe grinding, TIG (tungsten inert gas) dressing, hammer peening, and high-frequency mechanical impact (HFMI) treatments are commonly employed. On the other hand, these techniques require additional fabrication time and production cost. Therefore, there is keen interest with respect to thick steel plates with improved fatigue strength. This study examined the fatigue characteristics of conventional steel (Ferrite–Pearlite, F–P steel) and Ferrite–Bainite dual-phase steel (F–B steel). The fatigue behavior of both steels was investigated by a series of fatigue tests with three different types of welded joints. In case of gusset and cruciform-welded joints, fatigue strength of F–B steel is higher than that of F–P steel. F–B steel is known to exhibit improved fatigue performance associated with the existence of bainite microstructure. In addition, the fatigue data in this study are validated against the existing literatures. Based on the fatigue test results, a modified fatigue design curve is suggested from this study. In order to discuss the effects of fatigue crack path, the fatigue crack growth rate (FCGR) of both steels was investigated in terms of Paris’ law. Finally, microstructural analysis was conducted to discuss the fatigue performance.

中文翻译:

铁素体-珠光体和铁素体-贝氏体双相钢疲劳性能的比较

最近对大型船舶和深水勘探的需求增加了对更厚板的要求,以确保此类结构的足够强度。然而,使用较厚的板会对疲劳性能产生不利影响。为了提高疲劳寿命,通常采用焊后处理,例如焊趾打磨、TIG(钨惰性气体)修整、锤击和高频机械冲击 (HFMI) 处理。另一方面,这些技术需要额外的制造时间和生产成本。因此,人们对提高疲劳强度的厚钢板产生了浓厚的兴趣。本研究检验了常规钢(铁素体-珠光体、F-P 钢)和铁素体-贝氏体双相钢(F-B 钢)的疲劳特性。通过对三种不同类型的焊接接头进行一系列疲劳试验,研究了这两种钢的疲劳行为。在角撑板和十字焊接接头的情况下,F-B 钢的疲劳强度高于 F-P 钢。众所周知,由于贝氏体显微组织的存在,F-B 钢表现出改善的疲劳性能。此外,本研究中的疲劳数据与现有文献进行了验证。根据疲劳试验结果,本研究建议修改疲劳设计曲线。为了讨论疲劳裂纹路径的影响,根据巴黎定律研究了两种钢的疲劳裂纹扩展率(FCGR)。最后,进行显微组织分析以讨论疲劳性能。在角撑板和十字焊接接头的情况下,F-B 钢的疲劳强度高于 F-P 钢。众所周知,由于贝氏体显微组织的存在,F-B 钢表现出改善的疲劳性能。此外,本研究中的疲劳数据与现有文献进行了验证。根据疲劳试验结果,本研究建议修改疲劳设计曲线。为了讨论疲劳裂纹路径的影响,根据巴黎定律研究了两种钢的疲劳裂纹扩展率(FCGR)。最后,进行显微组织分析以讨论疲劳性能。在角撑板和十字焊接接头的情况下,F-B 钢的疲劳强度高于 F-P 钢。众所周知,由于贝氏体显微组织的存在,F-B 钢表现出改善的疲劳性能。此外,本研究中的疲劳数据与现有文献进行了验证。根据疲劳试验结果,本研究建议修改疲劳设计曲线。为了讨论疲劳裂纹路径的影响,根据巴黎定律研究了两种钢的疲劳裂纹扩展率(FCGR)。最后,进行显微组织分析以讨论疲劳性能。众所周知,由于贝氏体显微组织的存在,F-B 钢表现出改善的疲劳性能。此外,本研究中的疲劳数据与现有文献进行了验证。根据疲劳试验结果,本研究建议修改疲劳设计曲线。为了讨论疲劳裂纹路径的影响,根据巴黎定律研究了两种钢的疲劳裂纹扩展率(FCGR)。最后,进行显微组织分析以讨论疲劳性能。众所周知,由于贝氏体显微组织的存在,F-B 钢表现出改善的疲劳性能。此外,本研究中的疲劳数据与现有文献进行了验证。根据疲劳试验结果,本研究建议修改疲劳设计曲线。为了讨论疲劳裂纹路径的影响,根据巴黎定律研究了两种钢的疲劳裂纹扩展率(FCGR)。最后,进行显微组织分析以讨论疲劳性能。根据巴黎定律研究了两种钢的疲劳裂纹扩展率 (FCGR)。最后,进行显微组织分析以讨论疲劳性能。根据巴黎定律研究了两种钢的疲劳裂纹扩展率 (FCGR)。最后,进行显微组织分析以讨论疲劳性能。
更新日期:2020-06-03
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