基于形变热处理的新一代9Cr马氏体耐热钢焊接热影响区组织演变与高温蠕变性能调控

张竟文; 余黎明; 刘永长; 丁然; 刘晨曦; 马宗青; 李会军; 高秋志; 王辉

doi:10.1007/s12613-023-2760-0

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文章导航 > 矿物冶金与材料学报（英文） > 2024 > 最新录用

Jingwen Zhang, Liming Yu, Yongchang Liu, Ran Ding, Chenxi Liu, Zongqing Ma, Huijun Li, Qiuzhi Gao, and Hui Wang, Improving creep strength of the fine-grained heat-affected zone of novel 9Cr martensitic heat-resistant steel via modified thermo-mechanical treatment, Int. J. Miner. Metall. Mater.,(2024). https://doi.org/10.1007/s12613-023-2760-0

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Jingwen Zhang, Liming Yu, Yongchang Liu, Ran Ding, Chenxi Liu, Zongqing Ma, Huijun Li, Qiuzhi Gao, and Hui Wang, Improving creep strength of the fine-grained heat-affected zone of novel 9Cr martensitic heat-resistant steel via modified thermo-mechanical treatment, Int. J. Miner. Metall. Mater.,(2024). https://doi.org/10.1007/s12613-023-2760-0

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研究论文

基于形变热处理的新一代9Cr马氏体耐热钢焊接热影响区组织演变与高温蠕变性能调控

1)
天津大学材料科学与工程学院, 天津 300354, 中国
2)
东北大学(秦皇岛分校)资源与材料学院, 秦皇岛 066004, 中国
3)
成都大学机械工程学院, 成都 610106, 中国

文章亮点

（1）建立了形变热处理对G115钢焊前基体组织的定向调控机制。

（2）揭示了形变热处理遗传行为对焊接热影响区组织演变的控制机理。

（3）澄清了焊接热影响区协同强化机制，并实现高温蠕变强度的明显提升。

中文摘要

新一代马氏体耐热钢G115被认为是高参数先进火电机组关键高温部件制造成形的主要备选材料。然而，服役过程中焊接接头细晶热影响区极易引发高温蠕变先行失效行为，严重威胁机组的安全运行。在本研究中，设计开发了一种形变热处理工艺（正火+冷变形+回火），通过焊前形变热处理定向调控G115钢基体组织，以控制焊接过程中热影响区的组织演变行为，进一步实现其高温蠕变强度的明显提升。焊前形变热处理可以细化基体组织中M₂₃C₆相尺寸，引入高密度形变位错及界面，有效促进了焊接过程中M₂₃C₆相的回溶行为，并缓解了C、Cr元素在原始奥氏体晶界处的偏聚。在焊后热处理过程中，M₂₃C₆相在新形成奥氏体晶粒边界及内部各类界面处弥散均匀再析出，有效抑制了此类界面迁移回复行为。此外，形变位错可以为沉淀相提供形核位点，明显提高了板条内部MX相和富Cu相的析出数密度。在高温蠕变过程中，沉淀相、位错及界面三者之间的交互作用明显增强，很大程度上延缓了低硬度亚晶晶粒的形成。相比于初始态，形变热处理后，G115钢焊接接头细晶热影响区的高温蠕变断裂时间延长了将近20%。本研究的开展不仅为G115钢焊接接头服役中面临的关键问题提供了创新性解决策略，也进一步推动了其广泛工业应用。

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Research Article

Improving creep strength of the fine-grained heat-affected zone of novel 9Cr martensitic heat-resistant steel via modified thermo-mechanical treatment

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Abstract

Abstract

The infamous type IV failure within the fine-grained heat-affected zone (FGHAZ) in G115 steel weldments seriously threatens the safe operation of ultra-supercritical (USC) power plants. In this work, the traditional thermo-mechanical treatment was modified via the replacement of hot-rolling with cold rolling, i.e., normalizing, cold rolling, and tempering (NCT), which was developed to improve the creep strength of the FGHAZ in G115 steel weldments. The NCT treatment effectively promoted the dissolution of preformed M₂₃C₆ particles and relieved the boundary segregation of C and Cr during welding thermal cycling, which accelerated the dispersed reprecipitation of M₂₃C₆ particles within the fresh reaustenitized grains during post-weld heat treatment. In addition, the precipitation of Cu-rich phases and MX particles was promoted evidently due to the deformation-induced dislocations. As a result, the interacting actions between precipitates, dislocations, and boundaries during creep were reinforced considerably. Following this strategy, the creep rupture life of the FGHAZ in G115 steel weldments can be prolonged by 18.6%, which can further push the application of G115 steel in USC power plants.
- G115 steel;
- fine-grained heat-affected zone;
- creep strength;
- element segregation;
- nano-sized precipitates

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