Investigation of fatigue and fracture characteristics for low-temperature metals considering the effects of various allo
- PDF / 3,583,626 Bytes
- 12 Pages / 595.276 x 790.866 pts Page_size
- 105 Downloads / 212 Views
RESEARCH PAPER
Investigation of fatigue and fracture characteristics for low-temperature metals considering the effects of various alloying components Jeong Yeol Park 1 & Myung Hyun Kim 1,2 Received: 25 September 2019 / Accepted: 15 June 2020 # International Institute of Welding 2020
Abstract 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. Keywords Mechanical properties . Fatigue crack growth rate (FCGR) . Crack tip opening displacement (CTOD) . Low-temperature metals . Alloying components
1 Introduction To avoid serious environmental pollution, the International Maritime Organization (IMO) has recently reinforced regulations on nitrogen oxide (NOx) and sulfur oxides (SOx). In accordance with MARPOL Annex VI, the NOx limit in Tier III and the global SOx limit will be reduced from 3.5 to 0.5%, which will be effective in January 2020 [1]. This has led to increasing demands for liquefied natural gas (LNG) in China, Recommended for publication by Commission XIII - Fatigue of Welded Components and Structures * Myung Hyun Kim [email protected] 1
Department of Naval Architecture and Ocean Engineering, Pusan National University, Busan 609-735, South Korea
2
International School of Ocean Science and Engineering, Harbin Institute of Technology, 92 West Dazhi Street, Nan Gang District, Harbin, China
India, and the Middle East [2]. As the demand for LNG increases, more LNG carriers (LNGCs), floating liquefied natural gas (FLNGs), and very large gas carriers (VLGCs) are required. The structural integrity of storage tanks is one of the most important issues in the construction of LNG carriers. In order to establish the structural integrity of storage tanks, the p
Data Loading...
