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| Effect of Strain Rate on Tensile Deformation Behavior of Laser Welded Joints of Superalloy GH4169 |
Qiang ZHAO,Yang LIU( ),Lei WANG,Fang LI |
| Key Lab for Anisotropy and Texture of Materials, Northeastern University, Shenyang 110819, China |
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Cite this article:
Qiang ZHAO,Yang LIU,Lei WANG,Fang LI. Effect of Strain Rate on Tensile Deformation Behavior of Laser Welded Joints of Superalloy GH4169. Chinese Journal of Materials Research, 2016, 30(12): 881-887.
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Abstract The effect of strain rate on the deformational behavior of laser welded joint of superalloy GH4169 was investigated, and the mechanism for strain rate sensitivity of the tensile deformation was discussed. The results show that the welded joints were more sensitive to the strain rate compared to the base material. The strain rate had little influence on the strength of welded joints at the strain rate range from 10-3 s-1 to 10-1 s-1. When the strain rate was higher than 100 s - 1, the yield strength and ultimate tensile strength of the welded joint increased with increasing strain rate, at the same time the yield strength had a much obvious increase. On the other hand, the plasticity of the welded joint tended to decrease with the increasing strain rate, however it increased while the strain rate changed from 101 s-1 to 102 s-1 and then reached the peak value of ductility by the strain rate of 102 s-1. The tensile failure location changed from the base material via the softened heat-affected zone to near the fusion zone with the increase of the strain rate. The strain rate sensitivity of deformation and fracture behavior of the welded joint under high strain rate was mainly caused by the difference of strain rate sensitivity of microstructures at different positions in the welded joint.
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Received: 17 March 2016
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| Fund: *Supported by National Natural Science Foundation of China Nos. 51571052&51371044, Fundamental Research Funds for the Central Universities No. L1502027, Nature Science Foundation of Liaoning Province No. 2014020034. |
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