Synchronously improving strength and toughness for pipeline steel weld via cerium adding

IF 3 2区工程技术 Q2 ENGINEERING, MECHANICAL

International Journal of Pressure Vessels and Piping Pub Date : 2025-02-14 DOI:10.1016/j.ijpvp.2025.105466

Ce Wang , Xinjie Di , Lianshuang Dai , Jin Liu , Jiawei Han , Xiaocong Yang , Zhaoqing Yang , Shaohua Cui , Chang Zhang , Zhibo Ma , Chengning Li

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引用次数: 0

Abstract

The requirement for higher pressure gas flows and lower temperature service environments has emphasized the necessity to solve the trade-off between strength and impact toughness in pipeline steel weld. In this study, the strength and toughness were improved synchronously via cerium adding, and the strengthening-toughening mechanism and fracture behavior of the weld were revealed by multi-scale characterization. The research results indicated that the addition of Ce in 50–100 ppm can change the inclusion the inclusion from a single Al₂O₃ to a mixture of Al₂O₃ and CeAlO₃, and refines the its size. In addition, the original austenite grain size, acicular ferrite size and grain boundary ferrite fraction also decrease. The reduction of grain boundary ferrite and inclusions effectively inhibited the crack initiation position, which increased the yield strength from 584±11 MPa to 629±11 MPa and 603±12 MPa, the impact toughness from 73±11 J to 123±12 J and 107±12 J. Therefore, with the Ce content from 0 to 50 ppm and 100 ppm, the strength and toughness of the weld appear to increase and then decrease. Moreover, the coarse grain boundary ferrite cannot produce coordinated deformation due to its low Schmidt factor, resulting in the fracture of grain boundary ferrite, which seriously decrease the crack propagation energy.

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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.