Repair of Stress Corrosion Cracking in Overlaying of Inconel 182 by Laser Surface Melting

Bao, Gang; Iguro, Syuntaro; Inkyo, Mitsugi; Shinozaki, Kenji; Mahara, Yoichi; Watanabe, Hiroshi

doi:10.1007/bf03263422

Cited by 5 publications

(3 citation statements)

References 10 publications

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“…For the LSM process, the thermal cycle calculated by the FEM model (Bao et al, 2005b) was used for diffusion calculation. In a similar way like SMAW process, only the single pass LSM process is taken into account without the consideration of reheat effect by sequential LSM process.…”

Section: Calculation Of Cr Concentration Distribution Near the Intergmentioning

confidence: 99%

Precipitation and Cr depletion profiles of Inconel 182 during heat treatments and laser surface melting

Bao

Yamamoto

Shinozaki

2009

Journal of Materials Processing Technology

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a b s t r a c tThermodynamic and kinetic modeling were conducted to simulate Cr depletion profiles near grain boundaries in Inconel 182 during heat treatments and laser surface melting (LSM) using Thermo-Calc and DICTRA code. The effect of Nb addition was also considered in the modeling. Based on the good agreement with Cr concentration distributions during the heat treatments measured experimentally, Cr depletion profiles adjacent to grain boundaries during the heat treatments and the LSM process were modeled. The Cr depletion profiles were evaluated using the Cr depletion area below the critical Cr concentration for intergranular cracking/intergranular stress corrosion cracking (IGC/IGSCC) susceptibility (12 mass%).Compared with the result of the Streicher test, the calculated Cr depletion areas showed good agreement with IGC/IGSCC susceptibilities. The sample after stress relief (SR) treatment had the largest Cr depletion area and showed the poorest IGC/IGSCC resistance. Cr depletion showed some recovery during subsequent low temperature sensitization (LTS).The sample after the LSM process had the smallest Cr depletion area and showed the best IGC/IGSCC resistance.

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Section: Calculation Of Cr Concentration Distribution Near the Intergmentioning

confidence: 99%

Precipitation and Cr depletion profiles of Inconel 182 during heat treatments and laser surface melting

Bao

Yamamoto

Shinozaki

2009

Journal of Materials Processing Technology

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“…Simulation of LSM and LSM + LTS procedure: The carbide precipitation process was also tried to model the LSM procedure. Thermal cycle achieved from the FEM calculation [13] was used for diffusion calculation (Fig. 8).…”

Section: Modeling Of Sr Sr + Lts Sr + Lts + Lsm and Sr + Lts + Lsm mentioning

confidence: 99%

Modeling of precipitation and Cr depletion profiles of Inconel 600 during heat treatments and LSM procedure

Bao

Shinozaki

Inkyo

et al. 2006

Journal of Alloys and Compounds

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“…The repairing possibility of parts of nuclear power plants with SCC has been discussed early, 14 the SCC existing on the specimen surface of deposited metal of Inconel 182 could be sealed successfully using the suitable LSM condition, and the specimen after SCC sealing with LSM procedure showed excellent IGC/ IGSCC resistance. Thus, the present work was undertaken to investigate the effect of different heat treatments during repairing procedure on microstructure evolutions.…”

Section: Introductionmentioning

confidence: 99%

Influence of heat treatments and chemical composition on SCC susceptibility during repairing procedure of overlaying of Inconel 182 by laser surface melting

Bao¹,

Shinozaki²,

Iguro³

et al. 2005

Science and Technology of Welding and Joining

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A practical repairing technique using laser surface melting (LSM) was developed to remove the stress corrosion cracking (SCC) in overlaying of Inconel 182. Influence of microstructure of different heat treatments performed during repairing process on intergranular cracking/intergranular stress corrosion cracking (IGC/IGSCC) susceptibility was discussed. The intergranular precipitate was identified as M23 C6 by TEM. The microstructure with no intergranular precipitate and refiner sub-grain after LSM process shows excellent IGC/IGSCC resistance. The stress relief heat treatment induced severe microstructure of high IGC/IGSCC susceptibility, owing to the semicontinuous intergranular precipitation. The influence of Nb/C ratio on IGC/IGSCC susceptibility of three nickel based superalloys after LSM process was also investigated. For both of the Inconel 182 alloys with different Nb content, the microstructure after LSM process and following sensitisation treatment showed precipitation free grain boundary. The results of corrosion tests also indicated that the material with higher Nb/C ratio showed higher IGC/IGSCC resistance after LSM process and following sensitisation treatment.

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Repair of Stress Corrosion Cracking in Overlaying of Inconel 182 by Laser Surface Melting

Cited by 5 publications

References 10 publications

Precipitation and Cr depletion profiles of Inconel 182 during heat treatments and laser surface melting

Precipitation and Cr depletion profiles of Inconel 182 during heat treatments and laser surface melting

Modeling of precipitation and Cr depletion profiles of Inconel 600 during heat treatments and LSM procedure

Influence of heat treatments and chemical composition on SCC susceptibility during repairing procedure of overlaying of Inconel 182 by laser surface melting

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