首页|Creep deformation and rupture behavior of 10Cr-3Co-2W heat-resistant steel weldments in ultra supercritical power units

Creep deformation and rupture behavior of 10Cr-3Co-2W heat-resistant steel weldments in ultra supercritical power units

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  • NSTL
  • Elsevier
Creep deformation and rupture behavior of a martensitic heat resistant steel (10Cr-3Co-2W) welded joints prepared by vacuum electron beam welding for supercritical power generation unit are investigated employing traditional uniaxial tensile creep, 898 K (625 degrees C) to 948 K (675 degrees C) and 105 MPa to 250 MPa, and room temperature nanoindentation on different welding micro zones. The rupture location shifts from base metal (ductile rupture) for the shortest creep time of 74 h, to heat affected zone (brittle Type IV rupture) for the rest crept specimens. Accordingly, a softening phenomenon is observed in fine grain heat affected zone in crept specimens for longer creep times, where voids, precipitates and reduced dislocation density are found and further discussed. The extrapolating creep rupture time under various creep temperature and stress combinations and the 100,000 h creep rupture strength for different temperatures are predicted employing the Larson-Miller parameter method, which satisfies the industry service condition. Compared with tensile creep the nanoindentation creep yields faster creep rates and higher stress exponents; and the largest strain rate sensitivity value (m) in weld metal implies that weld metal has the best creep resistance while heat affected zone and base metal are more likely to appear creep rupture.

Martensitic heat-resistant steelVacuum electron beam weldingCreep behaviorCreep cavitiesPrecipitatesMODIFIED 9CR-1MO STEELIV CRACKING BEHAVIORHIGH-TEMPERATUREWELDED-JOINTSLAVES-PHASEFERRITIC/MARTENSITIC STEELSNANOINDENTATION CREEPFRACTURE MORPHOLOGYAFFECTED ZONEP91 STEEL

Huang, Yanyan、Zhan, Yucun、Luo, Xiaowu、Xiong, Jiankun、Yang, Jianping、Mao, Guijun、Yang, Lin、Nie, Fuheng

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Chengdu Univ

Tsinghua Univ

Dongfang Turbine Co Ltd

2022

10.1016/j.engfailanal.2021.105984

Engineering failure analysis

Engineering failure analysis

EISCI
ISSN：1350-6307
年,卷(期)：2022.133
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