FRACTURE TOUGHNESS OF WELDED JOINTS OF X100 HIGH-STRENGTH PIPELINE STEEL

doi:10.3724/SP.J.1037.2012.00703

Acta Metall Sin

2013, Vol. 49

Issue (5): 576-582 DOI: 10.3724/SP.J.1037.2012.00703

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FRACTURE TOUGHNESS OF WELDED JOINTS OF X100 HIGH-STRENGTH PIPELINE STEEL

BI Zongyue^1,2), YANG Jun^1,²⁾, NIU Jing³⁾, ZHANG Jianxun³⁾

1) National Engineering Technology Research Center for Petroleum and Natural Gas Tubular Goods,Baoji 721008

2) Steel Pipe Research Institute of Baoji Petroleum Steel Pipe Co., Ltd., Baoji 721008

3) School of Materials Science and Engineering, Xi'an Jiao Tong University, Xi'an 710065

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BI Zongyue, YANG Jun, NIU Jing, ZHANG Jianxun. FRACTURE TOUGHNESS OF WELDED JOINTS OF X100 HIGH-STRENGTH PIPELINE STEEL. Acta Metall Sin, 2013, 49(5): 576-582.

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Abstract

Fracture toughness of base metal, weld seam and heat-affected-zone (HAZ) in X100 high-strength pipeline steel welded joints was investigated by three-point crack tip opening displacement (CTOD) test. Microstructure and inclusion near fracture zones were observed by means of SEM and TEM. The results indicated that fracture toughness of X100 high-strength pipeline steel welded joints was greatly influenced by test temperature. At the same temperature, the numerical values of apparent crack initiation δ_0.05, conditional crack initiation δ_0.2 and δ_0.2BL of base metal are higher than that of weld seam and HAZ, and low temperature fracture toughness of base metal is better than those of weld seam and HAZ. With temperature decreasing, the fracture toughness of base metal, weld seam and HAZ decreased. The microstructure of near fracture zones of base metal specimen was composed of granular bainite (GB), a small quasi polygonal ferrite (QF) and lath bainite ferrite (BF), and the fine and equally dispersed M-A structure distributed on the grain boundary. The microstructure of near fracture zones of weld seam specimen was composed of acicular ferrite (AF), and the form of M-A constituents shows diversity, sharp-angled clearly. The microstructure of near fracture zones of coarse-grain HAZ was composed of GB and parallel LBF, and the square, wedged and bar M-A constituents distributed on the interior of grain, grain boundary and lath boundary. The poor fracture toughness of weld seam and HAZ specimen results from large size and cusp type M-A structure. While the higher distribution of inclusion in weld seam makes fracture toughness worse.

Key words: X100 pipeline steel welded joint fracture toughness crack tip opening displacement (CTOD)

Received: 27 November 2012

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https://www.ams.org.cn/EN/10.3724/SP.J.1037.2012.00703 OR https://www.ams.org.cn/EN/Y2013/V49/I5/576

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