热输入对G115钢模拟热影响区组织和力学性能的影响

IF 3 2区工程技术 Q2 ENGINEERING, MECHANICAL

International Journal of Pressure Vessels and Piping Pub Date : 2025-04-24 DOI:10.1016/j.ijpvp.2025.105534

Yuntong Wang , Qingshuang Ma , Ziyun Liu , Chenghao Pei , Jingwen Zhang , Liming Yu , Huijun Li , Qiuzhi Gao

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引用次数: 0

摘要

G115钢广泛应用于超超临界电厂的关键部件，焊接热输入对其热影响区（HAZ）性能影响较大。为了系统研究热输入对热影响区微观结构和力学行为的影响，利用Gleeble系统进行了不同热输入条件下的热模拟试验。结果表明，细晶HAZ对热输入的变化特别敏感。当热输入从8.64 kJ/cm增加到14.4 kJ/cm时，FGHAZ内低角晶界（lagb）的比例从56.9%增加到60.9%，晶粒尺寸分布更加均匀。这些微观结构的改进显著提高了FGHAZ的延展性。综合性能分析表明，热输入为14.4 kJ/cm时，热影响区整体力学性能最佳。

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Effect of heat input on microstructure and mechanical properties of simulated heat-affected zone in G115 steel

G115 steel is widely used in key components of ultra-supercritical power plants, and its heat-affected zone (HAZ) performance is significantly influenced by welding heat input. To systematically investigate the effect of heat input on the microstructure and mechanical behavior of HAZ, thermal simulation tests were conducted using the Gleeble system under various heat input conditions. The results indicate that the fine-grained HAZ (FGHAZ) is particularly sensitive to changes in heat input. As the heat input increases from 8.64 kJ/cm to 14.4 kJ/cm, the fraction of low-angle grain boundaries (LAGBs) in the FGHAZ rises from 56.9 % to 60.9 %, and the grain size distribution becomes more uniform. These microstructural improvements significantly enhance the ductility of the FGHAZ. Comprehensive performance analysis reveals that the HAZ exhibits the best overall mechanical properties at a heat input of 14.4 kJ/cm.

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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.