The correlation between Charpy impact energy and microstructural heterogeneity in the vicinity of fusion line for X80 girth welds at brittle-to-ductile transition region

IF 3 2区工程技术 Q2 ENGINEERING, MECHANICAL

International Journal of Pressure Vessels and Piping Pub Date : 2025-02-20 DOI:10.1016/j.ijpvp.2025.105478

Shengyi Sha , Qingshan Feng , Lianshuang Dai , Zengcai Li , Baoming Gong

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引用次数: 0

Abstract

This study investigates the correlation between Charpy impact energy and microstructural heterogeneity in the vicinity of fusion line (FL) for X80 steel girth welds to determine accurate absorbed energy values and minimize the apparent scatter at brittle-to-ductile transition region. The results indicate that both the total impact energy and stable crack growth energy demonstrate a linear dependence on the proportion of FL in the crack propagation path, while the crack initiation energy remains largely unaffected. Furthermore, fractographic observations reveal that the fracture mode transition from ductile dimples to cleavage fracture is a key factor contributing to the high scatter of Charpy impact values in the FL region. Specimens with lower impact toughness exhibited numerous cleavage facets and secondary cracks near the primary crack. In contrast, specimens with higher impact toughness exhibited more tortuous primary crack path. In summary, the scatter in Charpy impact energy at the FL region is influenced by the microstructural characteristics along the crack propagation path and the degree of crack tortuosity.

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来源期刊

International Journal of Pressure Vessels and Piping 工程技术-工程：机械

CiteScore

5.30

自引率

13.30%

发文量

208

审稿时长

17 months

期刊介绍： Pressure vessel engineering technology is of importance in many branches of industry. This journal publishes the latest research results and related information on all its associated aspects, with particular emphasis on the structural integrity assessment, maintenance and life extension of pressurised process engineering plants. The anticipated coverage of the International Journal of Pressure Vessels and Piping ranges from simple mass-produced pressure vessels to large custom-built vessels and tanks. Pressure vessels technology is a developing field, and contributions on the following topics will therefore be welcome: • Pressure vessel engineering • Structural integrity assessment • Design methods • Codes and standards • Fabrication and welding • Materials properties requirements • Inspection and quality management • Maintenance and life extension • Ageing and environmental effects • Life management Of particular importance are papers covering aspects of significant practical application which could lead to major improvements in economy, reliability and useful life. While most accepted papers represent the results of original applied research, critical reviews of topical interest by world-leading experts will also appear from time to time. International Journal of Pressure Vessels and Piping is indispensable reading for engineering professionals involved in the energy, petrochemicals, process plant, transport, aerospace and related industries; for manufacturers of pressure vessels and ancillary equipment; and for academics pursuing research in these areas.