The Effect of Rare Earth on the Precipitated Phases During Aging Process of T91 Heat-resistant Steel

Li Gen; Liu Jun; Wang Shijun; Jia Lei; He Xikou

doi:10.20057/j.1003-8620.2025-00123

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The Effect of Rare Earth on the Precipitated Phases During Aging Process of T91 Heat-resistant Steel

Forming and Phase Transition | 更新时间：2025-09-02

- The Effect of Rare Earth on the Precipitated Phases During Aging Process of T91 Heat-resistant Steel
- Special Steel Vol. 46, Issue 4, Pages: 122-127(2025)
- 作者机构：
  
  1.钢铁研究总院有限公司特殊钢研究院，北京 100081
  2.北京科技大学绿色低碳钢铁冶金全国重点实验室，北京 100081
- 作者简介：
- 基金信息：
- DOI：10.20057/j.1003-8620.2025-00123
  CLC： TG142.1
- Received：26 April 2025，
  
  Revised：2025-06-10，
  
  Accepted：10 June 2025，
  
  Published：30 July 2025
- 稿件说明：
移动端阅览
李根,刘俊,汪仕俊等.稀土对T91耐热钢时效过程析出相的影响[J].特殊钢,2025,46(04):122-127.

Li Gen,Liu Jun,Wang Shijun,et al.The Effect of Rare Earth on the Precipitated Phases During Aging Process of T91 Heat-resistant Steel[J].Special Steel,2025,46(04):122-127.
李根,刘俊,汪仕俊等.稀土对T91耐热钢时效过程析出相的影响[J].特殊钢,2025,46(04):122-127. DOI： 10.20057/j.1003-8620.2025-00123.

Li Gen,Liu Jun,Wang Shijun,et al.The Effect of Rare Earth on the Precipitated Phases During Aging Process of T91 Heat-resistant Steel[J].Special Steel,2025,46(04):122-127. DOI： 10.20057/j.1003-8620.2025-00123.

摘要

以T91为代表的9%～12%Cr马氏体耐热钢因其优异的高温性能广泛应用于超超临界火电系统，但其长期服役过程中析出相粗化与组织失稳导致的蠕变性能退化仍是限制其服役寿命的关键瓶颈。本研究通过系统研究了稀土

［Ce+Y］为0%、0.027%、0.064%对T91钢550 ℃时效过程中析出相演变的影响，结合SEM/TEM表征，揭示了稀土Ce-Y复合添加对组织稳定性的调控机理。结果表明，稀土促进了时效过程Ce和V在M

相周边及内部富集，通过阻碍Cr在基体中的扩散限制了析出相粗化，3 000 h时效过程中M

相粗化系数减小52%，同时，0Y未出现明显富集。此外，稀土通过改性夹杂物并抑制位错回复，使MX相数量密度提高32%，且时效3 000 h后保持不变。本研究证实稀土微合金化是提升马氏体钢高温组织稳定性的有效策略，相关结果可为新一代长寿命高强度耐高温马氏体耐热钢成分设计提供理论指导。

Abstract

Martensitic heat-resistant steel with 9%-12%Cr represented by T91 is widely used in ultra-supercritical thermal power systems due to its excellent high-temperature performance. However， the creep performance degradation ca

used by phase precipitation and microstructure instability during long-term service is still the key bottleneck limiting its service life.This study systematically investigates the effects of rare earth （RE）

［Ce+Y］ addition （0%， 0.027%， and 0.064%） on the precipitation phases evolution of T91 steel during aging at 550 ℃. Combining with SEM/TEM characterization， the mechanism of RE Ce-Y composite addition in stabilizing microstructures are revealed. The results show that RE promotes the enrichment of Ce and V in the M

phase around and inside， and restricts the coarsening of precipitated phases by hindering the diffusion of Cr in the matrix. During the 3 000 h aging process， the coarsening coefficient of M

phase decreases by 52%， while Y does not appear to be significantly enriched. In addition， the number density of MX phase is increased by 32% through modified inclusions by RE， and remains unchanged after aging for 3 000 h by inhibiting dislocation recovery.This study confirms that rare earth microalloying is an effective strategy to improve the high-temperature microstructural stability of martensitic steels， and provides a theoretical basis for designing next-generation long-life， high-strength heat-resistant steel.

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references

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