Abstract
Cold cracking susceptibility of the newly developed 9Cr2WVTa steel plate welded with the corresponding gas tungsten arc welding wire has been evaluated using the implant test and the Y-groove cracking test. Measurement of diffusible hydrogen content shows that the welding wire is ultra-low welding consumables (0.40 mL/100 g). Results of the implant test show that the fracture critical stress without pre-heating is only 300 MPa and increases up to the yield strength with pre-heating to 150 °C. The fracture critical stress under high heat input decreases to 250 MPa owing to the formation of quenched microstructure. Fractographies show ductile dimple fracture under higher loads and quasi-cleavage fracture under lower loads. Results of Y-groove cracking tests show that the minimum pre-heating temperature is 150 °C and the maximum transverse residual stress is located at the root of the weld metal. Therefore, the heat input should be chosen in a proper range and the pre-heating temperature is no less than 150 °C.
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Acknowledgments
This work was supported by the National Natural Science Foundation of China (No. 91226204) and the Chinese Academy of Science Strategic Pilot Project (The future of advanced nuclear energy-ADS evolution system) under Grant NO: XDA03010304. The authors acknowledge the valuable discussions with Dr. Xiangjun Chen in IMR, CAS.
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Wang, J., Lu, S., Li, Y. et al. Cold Cracking Sensitivity of a Newly Developed 9Cr2WVTa Steel. J. of Materi Eng and Perform 26, 258–267 (2017). https://doi.org/10.1007/s11665-016-2432-6
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DOI: https://doi.org/10.1007/s11665-016-2432-6