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DENG Caiyan, NIU Yaru, WANG Dongpo, GONG Baoming. Low-temperature fracture toughness of welded joints for TOP-TIG welding on 9Ni steel[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2018, 39(1): 111-114. DOI: 10.12073/j.hjxb.2018390025
Citation: DENG Caiyan, NIU Yaru, WANG Dongpo, GONG Baoming. Low-temperature fracture toughness of welded joints for TOP-TIG welding on 9Ni steel[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2018, 39(1): 111-114. DOI: 10.12073/j.hjxb.2018390025
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Low-temperature fracture toughness of welded joints for TOP-TIG welding on 9Ni steel

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  • Received Date: December 01, 2016
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  • According to AWS D1.1M-2010 and ISO 15653:2010, the crack tip opening displacement (CTOD) test and the Charpy impact test of TOP-TIG welded joints made by 9Ni steel using in liquefied nature gas (LNG) had been conducted. The microstructure, X-ray diffractometry and fracture surface were performed to study the low-temperature toughness of welded joints for TOP-TIP welding on 9Ni steel. The results revealed that the impact toughness of the welded joints was very good and much higher than the standard requirements; The CTOD characteristic values were higher. The microstructure of HAZ was mainly consisted of lath martensite with more dislocation. The fracture surface of HAZ showed quasi-cleavage fracture with shallow and small dimple. The microstructure of the welded seam comprised of austenite dendritic structure and other equiaxed crystal had excellent fracture toughness which with a significant number of dimple fracture surface. The low temperature toughness of welded joints for TOP-TIG welding on 9 Ni steel was good enough to reach the engineering requirements.
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  • 周昭伟, 蔡宏彬, 江崇华, 等. 9%Ni钢焊接熔合区氢致裂纹的研究术的研究[J]. 焊接学报, 1989, 10(1): 37-46.Zhou Zhaowei, Cai Hongbin, Jiang Chonghua,et al. A study of hydrogen-induced cracking in the weld bond of 9% Ni steel[J]. Transactions of the China Welding Institution, 1989, 10(1): 37-46.[2] Katsuyoshi, Hiroshi, Toshiharu. Development of hot wire TIG welding methods using pulsed to heat filler wire research on pulse heated hot wire TIG welding processes[J]. Quarterly Journal of the Japan Welding Society, 2003, 21(3): 362-373.[3] 杨新岐, 王东坡, 李小魏, 等. 海洋石油平台焊接接头大型CTOD试验[J]. 焊接学报, 2002, 23(4): 48-52.Yang Xinqi, Wang Dongpo, Li Xiaowei,et al. Large sized CTOD test for welded joints of offshore petroleum platform[J]. Transactions of the China Welding Institution, 2002, 23(4): 48-52.[4] AWS D1.1M-2010, Structural Welding Code[S]. America: American National Standard Society, 2010.[5] Institution B S. BS ISO15653: 2010, Metallic materials—Method of test for the determination of quasistatic fracture toughness of welds[S]. Switzerland: ISO copyright office, 2010.[6] DNV-OS-C401: 2014, Fabrication and testing of offshore structures[S]. Norway: Det Norske Veritas, 2014.[7] DNV-OS-F101: 2013, Submarine pipeline systems[S]. Norway: Det Norske Veritas, 2013.[8] API 1104-2013, Welding of Pipelines and Related Facilities[S]. America: American Petroleum Association, 2013.[9] Strife J R, Passoja D E. The effect of heat treatment on microstructure and cryogenic fracture properties in 5Ni and 9Ni steel[J]. Metallurgical Transactions A, 1980, 11(8): 1341-1350.[10] Lacroix G, Pardoen T, Jacques P J. The fracture toughness of TRIP-assisted multiphase steels[J]. Acta Materialia, 2008, 56: 3900-3913.
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