TY - JOUR
T1 - Evaluation of creep crack growth rate of P92 welds using fracture mechanics parameters
AU - Yatomi, Masataka
AU - Fuji, Akio
AU - Tabuchi, Masaaki
AU - Hasegawa, Yasushi
AU - Kobayashi, Ken Ischi I.
AU - Yokobori, Toshimitsu
AU - Yokobori, Takeo
PY - 2010/8/1
Y1 - 2010/8/1
N2 - High Cr ferritic heat resisting steels have been widely used for boiler components in ultrasupercritical thermal power plants operated at about 600°C. In the welded joint of these steels, type-IV crack initates in the fine-grained heat affected zone during long-term use at high temperatures and their creep strength decreases. In this paper, creep properties and creep crack growth (CCG) properties of P92 welds are presented. The CCG tests are carried out using cross-welded compact tension C(T) specimens at several temperatures. The crack front was located within the fine-grained HAZ region to simulate type-IV cracking. Finite element analysis was conducted to simulate multiaxiality in welded joints and to compare experimental results. The constitutive behavior for these materials is described by a power-law creep model. C* and Q* parameters are used to evaluate CCG rate of P92 welds for comparison. C* parameters can characterize approximately 20% of the total life of CCG in P92 welds, and Q* parameters can characterize approximately 80% of the total life. Q* parameter is one of the useful parameters to predict CCG life in P92 welds.
AB - High Cr ferritic heat resisting steels have been widely used for boiler components in ultrasupercritical thermal power plants operated at about 600°C. In the welded joint of these steels, type-IV crack initates in the fine-grained heat affected zone during long-term use at high temperatures and their creep strength decreases. In this paper, creep properties and creep crack growth (CCG) properties of P92 welds are presented. The CCG tests are carried out using cross-welded compact tension C(T) specimens at several temperatures. The crack front was located within the fine-grained HAZ region to simulate type-IV cracking. Finite element analysis was conducted to simulate multiaxiality in welded joints and to compare experimental results. The constitutive behavior for these materials is described by a power-law creep model. C* and Q* parameters are used to evaluate CCG rate of P92 welds for comparison. C* parameters can characterize approximately 20% of the total life of CCG in P92 welds, and Q* parameters can characterize approximately 80% of the total life. Q* parameter is one of the useful parameters to predict CCG life in P92 welds.
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U2 - 10.1115/1.4001522
DO - 10.1115/1.4001522
M3 - Article
AN - SCOPUS:77956107321
SN - 0094-9930
VL - 132
JO - Journal of Pressure Vessel Technology, Transactions of the ASME
JF - Journal of Pressure Vessel Technology, Transactions of the ASME
IS - 4
M1 - 041404
ER -