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| 论文题目： |
Effect of laser shock on tensile deformation behavior of a single crystal nickel-base superalloy |
| 第一作者： |
Lu, G.X.;Liu JD(刘纪德);Qiao HC(乔红超);Zhou YZ(周亦胄);Jin T(金涛);Zhao JB(赵吉宾);Sun XF(孙晓峰);Hu ZQ(胡壮麒) |
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| 发表刊物： |
Materials Science and Engineering A |
| 发表年度： |
2017 |
| 卷,期,页： |
686,,46-53 |
| 论文出处： |
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| 论文摘要： |
This investigation focused on the tensile deformation behavior of a single crystal nickel-base superalloy, both in virgin condition and after laser shock processing (LSP) with varied technology parameters. Nanoindention tests were carried out on the sectioned specimens after LSP treatment to characterize the surface strengthening effect. Stress strain curves of tensile specimens were analyzed, and microstructural observations of the fracture surface and the longitudinal cross-sections of ruptured specimens were performed via scanning electron microscope (SEM), in an effort to clarify the fracture mechanisms. The results show that a surface hardening layer with the thickness of about 0.3–0.6 mm was gained by the experimental alloys after LSP treatment, but the formation of surface hardening layer had not affected the yield strength. Furthermore, fundamental differences in the plastic responses at different temperatures due to LSP treatment had been discovered. At 700 °C, the slip deformation was held back when it extended to the surface hardening layer and the ensuing slip steps improved the plasticity; however, at 1000 °C, surface hardening layer hindered the macro necking, which resulted in the relatively lower plasticity. |
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