In the past few decades, low-temperature metals such as SUS304L, nickel alloys, and high-manganese steels have been widely used for liquefied natural gas (LNG) storage tanks to satisfy the structural integrity requirements at low temperature. Many researchers have conducted studies to characterize the fatigue and fracture performance of low-temperature metals. However, only a limited number of studies have considered the effects of various welding processes and consumables. This study addresses the fatigue and fracture performance of low-temperature metals while considering the effects of various alloying components. Moreover, we investigated the fatigue and fracture performance of various welding processes. Flux core arc welding (FCAW) was employed for both SUS304L and 9 wt.% nickel alloy steel, while tungsten inert gas (TIG) and shield metal arc welding (SMAW) were applied to SUS304L and 9 wt.% nickel alloy steel, respectively. Submerged arc welding (SAW) was employed for high-manganese steel. Fatigue and fracture tests were conducted according to ASTM E647 and BS 7448. The mechanical properties of the weld metals were systematically analyzed. SUS304L with FCAW exhibited excellent crack tip opening displacement (CTOD) and fatigue crack growth rate (FCGR). We also observed the microstructure of weld metals and discuss the mechanisms related to the fatigue and fracture performance in the parent and weld metals.

中文翻译：

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考虑各种合金成分影响的低温金属疲劳和断裂特性研究

在过去的几十年中，诸如SUS304L，镍合金和高锰钢之类的低温金属已被广泛用于液化天然气（LNG）储罐，以满足低温下的结构完整性要求。许多研究人员已经进行了研究，以表征低温金属的疲劳和断裂性能。但是，只有有限的研究考虑了各种焊接工艺和消耗品的影响。这项研究考虑了各种合金成分的影响，同时解决了低温金属的疲劳和断裂性能。此外，我们研究了各种焊接工艺的疲劳和断裂性能。SUS304L和9 wt％的镍合金钢均采用药芯焊丝电弧焊（FCAW），钨极惰性气体（TIG）和屏蔽金属电弧焊（SMAW）分别应用于SUS304L和9 wt％的镍合金钢。埋弧焊（SAW）用于高锰钢。根据ASTM E647和BS 7448进行了疲劳和断裂测试。对焊接金属的力学性能进行了系统的分析。带有FCAW的SUS304L表现出优异的裂纹尖端开口位移（CTOD）和疲劳裂纹扩展率（FCGR）。我们还观察了焊接金属的微观结构，并讨论了与母体和焊接金属的疲劳和断裂性能相关的机理。系统分析了焊接金属的力学性能。带有FCAW的SUS304L表现出优异的裂纹尖端开口位移（CTOD）和疲劳裂纹扩展速率（FCGR）。我们还观察了焊接金属的微观结构，并讨论了与母体和焊接金属的疲劳和断裂性能相关的机理。系统分析了焊接金属的力学性能。带有FCAW的SUS304L表现出优异的裂纹尖端开口位移（CTOD）和疲劳裂纹扩展速率（FCGR）。我们还观察了焊接金属的微观结构，并讨论了与母体和焊接金属的疲劳和断裂性能相关的机理。