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
李根(1995—),男,博士,工程师; E-mail:ligen_1995@foxmail.com
收稿:2025-04-26,
修回:2025-06-10,
录用:2025-06-10,
纸质出版:2025-07-30
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.
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
w
[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
23
C
6
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
23
C
6
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。
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)
w
[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
23
C
6
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
23
C
6
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.
刘正东 . 电站耐热材料的选择性强化设计与实践 [M]. 北京 : 冶金工业出版社 , 2017 : 23 .
Grybėnas A , Makarevičius V , Baltušnikas A , et al . Correlation between structural changes of M 23 C 6 carbide and mechanical behaviour of P91 steel after thermal aging [J]. Materials Science and Engineering: A , 2017 , 696 : 453 - 460 .
Abe F . Creep rates and strengthening mechanisms in tungsten-strengthened 9Cr steels [J]. Materials Science and Engineering: A , 2001 , 319 : 770 - 773 .
Li J , Lu J D , Dai Y , et al . Correlation between aging grade of T91 steel and spectral characteristics of the laser-induced plasma [J]. Applied Surface Science , 2015 , 346 : 302 - 310 .
Sanchez-Hanton J J , Thomson R C . Characterization of isothermally aged Grade 91 (9Cr-1Mo-Nb-V) steel by electron backscatter diffraction [J]. Materials Science and Engineering: A , 2007 , 460 : 261 - 267 .
Abe F . Progress in Creep-resistant steels for high efficiency coal-fired powerplants [J]. Journal of Pressure Vessel Technology , 2016 , 138 ( 4 ): 040804 - 040824 。
Li H J , Huang M , Liang N N , et al . Precipitate characteristic of T91 ferritic/martensitic steel during short-term creep [J]. Metallurgical and Materials Transactions A , 2024 , 55 ( 2 ): 607 - 622 .
Vivas J , Capdevila C , Altstadt E , et al . Importance of austenitization temperature and ausforming on creep strength in 9Cr ferritic/martensitic steel [J]. Scripta Materialia , 2018 , 153 : 14 - 18 .
Lok V , Le T G , Yu J M , et al . Changes in creep property and precipitates due to aging of T91 steel after long-term service [J]. Journal of Mechanical Science and Technology , 2020 , 34 ( 8 ): 3283 - 3293 .
Yan J B , Gao Y M , Liang L , et al . Effect of yttrium on the cyclic oxidation behaviour of HP40 heat-resistant steel at 1 373 K [J]. Corrosion Science , 2011 , 53 ( 1 ): 329 - 337 .
Liu X , Zhang H F . Effect of Rare Earth on High Temperature Properties of Heat-Resisting Steel [J]. Advanced Materials Research , 2012 , 557-559 : 108 - 111
文 智 , 易丹青 , 王 斌 , 等 . 稀土对T91耐热钢动态再结晶行为影响 [J]. 北京科技大学学报 , 2013 , 35 ( 8 ): 1000 - 1006 .
Zhao W X , Wu Y , Jiang S H , et al . Micro-alloying effects of yttrium on recrystallization behavior of an alumina-forming austenitic stainless steel [J]. Journal of Iron and Steel Research , International, 2016 , 23 ( 6 ): 553 - 558 .
Chen L , Long H J , Liu X G , et al . Effect of rare earth alloying on creep rupture of economical 21Cr-11Ni-N heat-resistant austenitic steel at 650 ℃ [J]. Journal of Rare Earths , 2016 , 34 ( 4 ): 447 - 452 .
Xu Y W , Song S H , Wang J W . Effect of rare earth cerium on the creep properties of modified 9Cr-1Mo heat-resistant steel [J]. Materials Letters , 2015 , 161 : 616 - 619 .
Liu J , Li G , Shi C B , et al . Effect of Ce-Y composite addition on the inclusion evolution in T91 heat-resistant steel [J]. Materials , 2025 , 18 ( 7 ): 1459 .
王海燕 , 高雪云 , 任慧平 , 等 . 稀土La在α-Fe中占位倾向及对晶界影响的第一性原理研究 [J]. 物理学报 , 2014 , 63 ( 14 ): 369 - 373 .
Lee J S , Armaki H G , Maruyama K , et al . Causes of breakdown of creep strength in 9Cr-1.8 W-0.5Mo-VNb steel [J]. Materials Science and Engineering: A , 2006 , 428 ( 1-2 ): 270 - 275 .
Xiao X , Liu G Q , Hu B F , et al . Coarsening behavior for M 23 C 6 carbide in 12%Cr-reduced activation ferrite/martensite steel: Experimental study combined with DICTRA simulation [J]. Journal of Materials Science , 2013 , 48 ( 16 ): 5410 - 5419 .
Xu Y T , Zhang X Y , Tian Y B , et al . Study on the nu cleation and growth of M 23 C 6 carbides in a 10% Cr martensite ferritic steel after long-term aging [J]. Materials Characterization , 2016 , 111 : 122 - 127 .
0
浏览量
15
下载量
0
CSCD
0
CNKI被引量
关联资源
相关文章
相关作者
相关机构
京公网安备11010802024621