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

Jingwen Zhang; Liming Yu; Yongchang Liu; Ran Ding; Chenxi Liu; Zongqing Ma; Huijun Li; Qiuzhi Gao; Hui Wang

doi:10.1007/s12613-023-2760-0

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Article Navigation > International Journal of Minerals, Metallurgy and Materials > 2024 > Accepted Manuscript

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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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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Received: 14 July 2023; Revised: 22 September 2023; Accepted: 9 October 2023; Available online: 12 October 2023

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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