Effect of post weld heat treatment on microstructural and mechanical properties of martensitic heat-resistant steel weldments

IF 3 2区工程技术 Q2 ENGINEERING, MECHANICAL

International Journal of Pressure Vessels and Piping Pub Date : 2024-09-12 DOI:10.1016/j.ijpvp.2024.105323

Yanyan Huang , Tao Huang , Siyuan Zhang , Zizhen Yang , Qinpei Liu , Yucun Zhan , Kunyang Fan , Jiankun Xiong , Jianping Yang , Yang Guo , Xiaowu Luo , Qinghua Zhou

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Abstract

Martensitic heat-resistant steel (MHRS) serves as an important structural material for manufacturing ultra-supercritical unit due to its excellent fatigue resistance and corrosion resistance. Post weld heat treatment (PWHT) is a common method for regulating the microstructure and properties of MHRS welded parts. In this work, we investigated the influence of different PWHT methods on the microstructure, mechanical properties, and room temperature creep properties of Co3W2 welded joints. The results showed that post-weld direct tempering (PWDT) or post-weld re-automatizing and tempering (PWNT) treatment significantly reduces the differences in microstructure and local mechanical properties of as-welded joints. Compared to the as-welded specimens, the PWDT and PWNT welds show lower strength and hardness, but better impact resistance. The PWNT treated welds show more homogeneous microstructure and local mechanical performance, and better tensile property and impact resistance than PWDT welds. Furthermore, the fine grain heat affected zone in PWNT welds shows the smallest strain rate sensitivity value, which implies the PWNT method may alleviate type IV brittle fracture in martensitic heat-resistant steel weldments.

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焊后热处理对马氏体耐热钢焊件微观结构和机械性能的影响

马氏体耐热钢（MHRS）具有优异的抗疲劳性和耐腐蚀性，是制造超超临界机组的重要结构材料。焊后热处理（PWHT）是调节 MHRS 焊接件微观结构和性能的常用方法。在这项工作中，我们研究了不同 PWHT 方法对 Co3W2 焊点的微观结构、机械性能和室温蠕变性能的影响。结果表明，焊后直接回火（PWDT）或焊后再热处理和回火（PWNT）能显著减少焊点的微观结构和局部力学性能差异。与焊接试样相比，PWDT 和 PWNT 焊缝的强度和硬度较低，但耐冲击性较好。与 PWDT 焊缝相比，经过 PWNT 处理的焊缝显示出更均匀的微观结构和局部机械性能，以及更好的拉伸性能和抗冲击性能。此外，PWNT 焊缝中的细晶粒热影响区显示出最小的应变速率敏感性值，这意味着 PWNT 方法可减轻马氏体耐热钢焊缝的 IV 型脆性断裂。

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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.