Effects of stabilized heat treatment on stress rupture properties of high Si-bearing austenitic stainless steel weld metal

IF 3 2区工程技术 Q2 ENGINEERING, MECHANICAL International Journal of Pressure Vessels and Piping Pub Date : 2024-08-23 DOI:10.1016/j.ijpvp.2024.105300

Yakui Chen , Dong Wu , Shanping Lu

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Abstract

The 15Cr-9Ni-Nb austenitic stainless steel weld metal with a Si content of 3.5 wt% was prepared via gas tungsten arc welding and then held at 900 °C for 3 h for the stabilized heat treatment (SHT). The stress rupture properties of the as-welded (AW) and SHT weld metals at 550 °C were evaluated via the Larson-Miller parameter. The microstructure evolution was discussed during the 550 °C stress rupture process. The coarse σ-phase and relatively fine G-phase formed on the δ-ferrite during aging at 550 °C. In the AW weld metal, the continuous δ-ferrite with a large amount of coarse σ-phase led to the formation and expansion of cracks during the stress rupture process, which accelerated the eventual rupture and damaged the stress rupture properties. The SHT decreased the δ-ferrite content and formed a large amount of nanoscale NbC precipitated in the matrix. The decreased δ-ferrite content avoided the rapid formation and expansion of cracks and the nanoscale NbC blocked the dislocation movement during the stress rupture process, which improved the stress rupture properties.

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稳定热处理对高含硅奥氏体不锈钢焊接金属应力断裂性能的影响

通过气体钨极氩弧焊制备了硅含量为 3.5 wt% 的 15Cr-9Ni-Nb 奥氏体不锈钢焊缝金属，然后在 900 °C 下保温 3 小时进行稳定热处理 (SHT)。通过拉森-米勒（Larson-Miller）参数评估了焊接金属（AW）和 SHT 焊接金属在 550 ℃ 时的应力断裂特性。讨论了 550 °C 应力断裂过程中的微观结构演变。在 550 °C 时效过程中，δ-铁素体上形成了粗糙的 σ 相和相对较细的 G 相。在 AW 焊接金属中，带有大量粗σ相的连续 δ-铁素体导致应力断裂过程中裂纹的形成和扩展，从而加速了最终断裂，破坏了应力断裂性能。SHT 降低了δ-铁素体含量，并在基体中形成大量纳米级 NbC 沉淀。δ-铁氧体含量的降低避免了裂纹的迅速形成和扩展，纳米级 NbC 阻断了应力断裂过程中的位错运动，从而改善了应力断裂性能。

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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.