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Research Papers: Materials Technology

An Experimental Study for Fatigue Performance of 7% Nickel Steels for Type B Liquefied Natural Gas Carriers

[+] Author and Article Information
Young Woo Kim

Department of Naval Architecture
and Ocean Engineering,
Pusan National University,
Busan 609735, South Korea
e-mail: woo17121@pusan.ac.kr

Dong Jin Oh

Department of Naval Architecture
and Ocean Engineering,
Pusan National University,
Busan 609735, South Korea
e-mail: odj3315@psuan.ac.kr

Jae Myung Lee

Department of Naval Architecture
and Ocean Engineering,
Pusan National University,
Busan 609735, South Korea
e-mail: jaemlee@pusan.ac.kr

Byeong Jae Noh

Hyundai Heavy Industries,
Ulsan 682792, South Korea
e-mail: bjnoh@hhi.co.kr

Hee Joon Sung

Hyundai Heavy Industries,
Ulsan 682792, South Korea
e-mail: sungheejoon@hhi.co.kr

Ryuichi Ando

Nippon Steel and Sumitomo Metal Corporation,
Tokyo 100-8071, Japan
e-mail: ando.4rt.ryuichi@jp.nssmc.com

Toshiyuki Matsumoto

Class NK,
Tokyo 102-8567, Japan
e-mail: tmatsu@classnk.or.jp

Myung Hyun Kim

Department of Naval Architecture
and Ocean Engineering,
Pusan National University,
Busan 609735, South Korea
e-mail: kimm@psuan.ac.kr

1Corresponding author.

Contributed by the Ocean, Offshore, and Arctic Engineering Division of ASME for publication in the JOURNAL OF OFFSHORE MECHANICS AND ARCTIC ENGINEERING. Manuscript received June 18, 2014; final manuscript received February 3, 2016; published online April 1, 2016. Assoc. Editor: Lance Manuel.

J. Offshore Mech. Arct. Eng 138(3), 031401 (Apr 01, 2016) (6 pages) Paper No: OMAE-14-1065; doi: 10.1115/1.4032706 History: Received June 18, 2014; Revised February 03, 2016

Structural safety is one of the most important issues associated with liquefied natural gas (LNG) storage systems, such as LNG carriers, LNG Floating Production Storage Offloading (FPSO), and Floating Storage Regasification Unit (FSRU). One of the most common materials for the LNG storage systems has been 9% nickel steel over the last 50 years as it has excellent mechanical properties under cryogenic temperature. Recently, there have been efforts for lowering the nickel content due to the increased nickel price as well as the high price of nickel based welding consumables. In this respect, 7% nickel steels are recently developed for reducing the associated costs mainly for cryogenic applications. The newly developed 7% nickel steels are known to have improved toughness comparable to that of 9% nickel steels by thermomechanical control process (TMCP) and micro-alloying technology. The main objective of this study is to evaluate the fatigue performance of 7% nickel steels with a special attention to type B LNG carrier applications. Cyclic fatigue and fatigue crack growth rate (FCGR) tests for 7% nickel steels were conducted at room and cryogenic temperatures. Fatigue tests were carried out with three different types of specimens such as base metal, butt weld, and fillet weld to characterize the fatigue properties at various locations. In addition, FCGR tests were carried out using compact tension (C(T)) specimens. The difference of FCGR characteristics among base, weld, and heat affected zone (HAZ) is investigated. The fatigue and FCGR test results of 7% nickel steels are evaluated and compared with reference data of 9% nickel steel. Based on this study, it is observed that the 7% nickel steel exhibits similar fatigue performance in comparison with that of 9% nickel steel.

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Figures

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Fig. 1

Microstructure of 7% nickel steel

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Fig. 2

Detail dimension of test specimens (unit: mm): (a) tensile test specimen, (b) fatigue test specimens, (c) FCGR test specimen, and (d) notch location of FCGR test specimens

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Fig. 3

Equipment for cryogenic test

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Fig. 4

S–N curves of test results: (a) base metal, (b) butt weld, and (c) fillet weld

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Fig. 5

S–N curves with IIW FAT curve: (a) Butt weld and (b) fillet weld

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Fig. 6

S–N curves of 7% nickel steels, normalized by yield strength

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Fig. 7

Comparison results of FCGR test: (a) comparison with da/dN–ΔK curves of base metal, (b) comparison with da/dN–ΔK curves of weld metal, and (c) comparison with da/dN–ΔK curves of HAZ

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Fig. 8

Relationship of log C and m of Paris equation

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Fig. 9

Evaluation result of retained austenite [1]

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