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Journal of Chinese Society for Corrosion and protection  2017, Vol. 37 Issue (1): 9-15    DOI: 10.11902/1005.4537.2016.088
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Crack Growth Rate of Stress Corrosion Cracking of Inconel 625 in High Temperature Steam
Naiqiang ZHANG1,Guoqiang YUE1,Fabin LV1,Qi CAO1,Mengyuan LI2,Hong XU1()
1 Key Laboratory of Condition Monitoring and Control for Power Plant Equipment of Ministry of Education, North China Electric Power University, Beijing 102206, China
2 State Grid Energy Conservation Service CO. LTD., Beijing 102206, China
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Abstract  

Stress corrosion crack growth rate (CGR) tests of nickel-based alloy Inconel 625, as a candidate material for 700 ℃ ultra-supercritical steam turbine, has been completed at 700~750 ℃ in environments of alternating air and water vapor, as well as in steam with 0~8000 μg/L dissolved oxygen. The applied load is constant stress with intensity factor (K) and the crack growth rate is detected online by measuring the direct current potential drop (DCPD). Results show that the CGR in water vapor is greater than in air and which increases with increasing temperature and dissolved oxygen content. The mechanisms concerning the influence of temperature, medium environment and dissolved oxygen content on stress corrosion cracking are discussed.
Key words:  Nickel-based alloy      stress corrosion cracking      crack growth rate      dissolved oxygen     
Received:  29 June 2016     
Fund: Supported by National Natural Science Foundation of China (51471069)
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Naiqiang ZHANG
Guoqiang YUE
Fabin LV
Qi CAO
Mengyuan LI
Hong XU

Cite this article: 

Naiqiang ZHANG,Guoqiang YUE,Fabin LV,Qi CAO,Mengyuan LI,Hong XU. Crack Growth Rate of Stress Corrosion Cracking of Inconel 625 in High Temperature Steam. Journal of Chinese Society for Corrosion and protection, 2017, 37(1): 9-15.

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https://www.jcscp.org/EN/10.11902/1005.4537.2016.088     OR     https://www.jcscp.org/EN/Y2017/V37/I1/9

Fig.1  Dimensions of 0.5 T-CT specimen
Fig.2  Block diagram of stress corrosion crack growth test system in high temperature steam
Test step Temperature / ℃ Medium environment Loading method CGR / mms-1 Duration / h
S1 700 Air Constant K 3.39×10-8 146
S2 700 Water vapor Constant K 5.43×10-8 161
S3 750 Air Constant K 4.66×10-7 145
S4 750 Water vapor Constant K 5.06×10-7 148
S5 725 Air Constant K 1.48×10-7 156
S6 725 Water vapor Constant K 2.08×10-7 172
Table 1  Test conditions and results of Inconel 625 specimens in air and high temperature steam
Fig.3  Variation of SCC crack length of Inconel 625 with time in air and water vapor at 700~750 ℃
Fig.4  Fracture surfaces of Inconel 625 specimens after the crack growth rate test: (a) transition area from transgranular pre-crack SCC to intergranular SCC, (b) typical intergranular SCC area, (c) magnifying image of intergranular SCC area, (d) local transgranular SCC in the intergranular SCC area
Fig.5  Overall appearance of the crack of Inconel 625 specimen
Test step DO / μgL-1 Loading method CGR / mms-1 Duration / h
S1 8000 Constant K 2.24×10-7 118
S2 <10 Constant K 8.73×10-8 130
S3 2000 Constant K 1.14×10-7 132
S4 4000 Constant K 1.29×10-7 129
S5 6000 Constant K 1.50×10-7 107
Table 2  SCC test conditions and results of Inconel 625 specimens at 725 ℃ in water vapor containing different contents of dissolved oxygen
Fig.6  Variation of SCC crack length of Inconel 625 alloy with dissolved oxygen content in water vapor at 725 ℃
Fig.7  Arrhenius plot of crack growth rate and temperature
Temperature / ℃ Air Water vapor Times
CGR / mms-1
700 3.39×10-8 5.43×10-8 1.602
725 1.48×10-7 2.08×10-7 1.405
750 4.66×10-7 5.06×10-7 1.086
Table 3  Comparison of SCC crack growth rate in air and water vapor
Fig.8  Variation of crack propagation rate of Inconel 625 alloy with dissolved oxygen content at 725 ℃
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