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P23/P91焊缝的抗蠕变性及微观结构演变

Creep Resistance and Microstructure Evolution in P23/P91 Welds.

作者信息

Vodárek Vlastimil, Holešinský Jan, Kuboň Zdeněk, Palupčíková Renáta, Váňová Petra, Malcharcziková Jitka

机构信息

Faculty of Materials Science and Technology, VŠB-Technical University of Ostrava, 17. listopadu 2172/15, 708 00 Ostrava, Czech Republic.

CEZ, a.s., Duhová 2/1444, 140 53 Prague, Czech Republic.

出版信息

Materials (Basel). 2025 Jan 5;18(1):194. doi: 10.3390/ma18010194.

DOI:10.3390/ma18010194
PMID:39795840
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC11721015/
Abstract

This paper summarizes the results of investigations into heterogeneous P23/P91 welds after long-term creep exposure at temperatures of 500, 550 and 600 °C. Two variants of welds were studied: In Weld A, the filler material corresponded to P91 steel, while in Weld B, the chemical composition of the consumable material matched P23 steel. The creep rupture strength values of Weld A exceeded those of Weld B at all testing temperatures. Most failures in the cross-weld samples occurred in the partially decarburized zones of P23 or WM23 steel. The results of the investigations on the minor phases were in good agreement with kinetic simulations that considered a 0.1 mm fusion zone. Microstructural studies proved that carburization occurred in the P23/P91 weld fusion zones. The partial decarburization of P23 steel or WM23 was accompanied by the dissolution of MC and MC particles, and detailed studies revealed the precipitation of the Fe (W, Mo) Laves phase in decarburized areas. Thermodynamic simulations proved that the appearance of this phase in partially decarburized P23 steel or WM23 is related to a reduction in the carbon content in these areas. According to the results of creep tests, the EBSD investigations revealed a better microstructural stability of the partially decarburized P23 steel in Weld A.

摘要

本文总结了在500、550和600°C温度下长期蠕变暴露后异种P23/P91焊缝的研究结果。研究了两种焊缝变体：在焊缝A中，填充材料对应于P91钢，而在焊缝B中，消耗材料的化学成分与P23钢匹配。在所有测试温度下，焊缝A的蠕变断裂强度值均超过焊缝B。焊缝横向样本中的大多数失效发生在P23或WM23钢的部分脱碳区。对次要相的研究结果与考虑0.1mm熔合区的动力学模拟结果吻合良好。微观结构研究证明，P23/P91焊缝熔合区发生了渗碳。P23钢或WM23的部分脱碳伴随着MC和MC粒子的溶解，详细研究表明在脱碳区域析出了Fe (W, Mo) 拉夫斯相。热力学模拟证明，该相在部分脱碳的P23钢或WM23中的出现与这些区域碳含量的降低有关。根据蠕变试验结果，电子背散射衍射（EBSD）研究表明焊缝A中部分脱碳的P23钢具有更好的微观结构稳定性。

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