Twin Boundary Evolution Under Low-Cycle Fatigue of C-HRA-5 Austenitic Heat-Resistant Steel at High Temperature
Received date: 2021-09-07
Revised date: 2022-01-04
Online published: 2022-02-22
Supported by
Anhui Natural Science Foundation(2008085ME127);Natural Science Foundation of Anhui Provincial Education Department(KJ2020A0252);Key Project of Science and Technology in Shanxi Province(20181101014)
C-HRA-5 steel is a new type of austenitic heat-resistant steel with excellent oxidation resistance and corrosion resistance, and high endurance strength at high temperatures. This steel can be used in superheaters and reheaters applied in 630-700oC advanced ultrasupercritical fossil-fired power plants, which is of great strategic significance to realize national energy savings and emission reduction targets. Detwinning often occurs in austenitic stainless steel when high-temperature fatigue and creep set in. However, the detwinning mechanism in C-HRA-5 steel during high-temperature fatigue and its influence on fatigue crack initiation and propagation remain unclear. Therefore, in this work, the detwinning behavior of C-HRA-5 steel under strain-controlled low-cycle fatigue (LCF) was studied at 700oC. The evolution of twin boundaries (TBs), detwinning mechanism, and influence of residual TBs on fatigue cracks were analyzed using SEM, EBSD, and TEM. After solution treatment at high temperatures, the fraction of low coincidence site lattice boundaries reached 69% in C-HRA-5 steel with dominant Σ3-type TBs. There was a remarkable detwinning effect under LCF loading. The degree of detwinning increased with increasing strain amplitude ranging from 0.3% to 0.7%. The detwinning mechanism was mainly related to the interactions at the dislocation TBs and precipitation of M23C6 at TBs. The plastic deformation of C-HRA-5 steel was dominated by planar slip under LCF loading, which resulted in dislocation gliding on particular planes. Therefore, numerous dislocation slip bands were formed. The collision of dislocation slip bands with TBs changed the coherent orientation of TBs and eventually led to detwinning. Meanwhile, the dislocation-TBs interaction induced the precipitation of M23C6 carbide at some TBs during LCF at 700oC, which strengthened the pinning of TBs on dislocations, thus accelerating the detwinning process. The residual TBs had higher strength than random grain boundaries and could inhibit the initiation and propagation of fatigue cracks.
Key words： austenitic heat-resistant steel; low-cycle fatigue; detwinning; EBSD; fatigue crack
Hongwei ZHOU , Jianbing GAO , Jiaming SHEN , Wei ZHAO , Fengmei BAI , Yizhu HE . Twin Boundary Evolution Under Low-Cycle Fatigue of C-HRA-5 Austenitic Heat-Resistant Steel at High Temperature[J]. Acta Metall Sin, 2022 , 58(8) : 1013 -1023 . DOI: 10.11900/0412.1961.2021.00385
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