Creep behavior and microstructure evolution of creep cavities in the heat-affected zone of P92 steel joints

IF 3 2区工程技术 Q2 ENGINEERING, MECHANICAL

International Journal of Pressure Vessels and Piping Pub Date : 2025-03-15 DOI:10.1016/j.ijpvp.2025.105512

Chao Yang , Renqiang Shi , Jian Qiao

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Abstract

The Type IV fracture of P92 steel joints is characterized by the aggregation of micro-cavities leading to creep cracking, which presents a significant risk to the operational safety of P92 steel pipelines in ultra-supercritical plants. Consequently, it is essential to examine the evolution of creep cavities in the heat-affected zone of joints to provide early warning of potential cracking risks. This study characterized the hardness, microstructures, and electron backscatter diffraction (EBSD) images for two different P92 steel joints exhibiting Type IV fracture, as well as for a P92 steel joint without fracture. By building upon the understanding of creep damage mechanisms in homogeneous materials and integrating practical observations from P92 steel pipeline joint failures, we elucidated the microstructural evolution of creep cavities within the heat-affected zone of these heterogeneous materials using a micromechanics-based model. Our findings indicate that the nucleation of creep cavities varies across different regions of the joint, influenced by their distinct creep characteristics. Additionally, the growth of these cavities is regulated by the hydrostatic stress and stress triaxiality factor, while cavity coalescence is primarily governed by axial stress. To mitigate Type IV fracture, it is crucial to enhance creep resistance in the heat-affected zone and minimize axial stress levels.

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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.