Microcrack healing and local recrystallization in pre-deformed sheet by high density electropulsing
Microcrack healing and local recrystallization in pre-deformed sheet by high density electropulsing
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DOI：
10.1016/j.msea.2007.12.037
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发表时间：
2008-08-25
期刊：
影响因子：
6.4
通讯作者：
Wang, Zhong-Jin
中科院分区：
文献类型：
--
作者：
Song, Hui;Wang, Zhong-Jin
钛合金薄板的微裂纹是由塑性变形产生的。在环境条件下，采用高密度电脉冲(最大电流密度J(max) = (4.75 ~ 5.32) × 10(3) A/mm（2)，周期t(p) =110 μ s）处理损坏片材。利用光学显微镜（OM）和扫描电镜（SEM）观察了电脉冲处理前后的显微组织变化。采用单轴拉伸试验研究了钛合金薄板的塑性恢复程度。试验结果表明，在一定条件下，电脉冲处理可使8%预塑变形的试样塑性几乎完全恢复。电脉冲处理后，由于塑性变形而产生的微裂纹得到了修复，金属薄板内部发生了局部再结晶。研究结果表明，电脉冲处理是提高钛合金板材成形极限的有效方法。(c) 2007 Elsevier B.V.版权所有
The microcracks in the titanium alloy sheet are produced by plastic deformation. The damaged sheet is treated by high density electropulsing (maximum current density J(max) = (4.75-5.32) x 10(3) A/mm(2), period t(p) =110 mu s) under ambient conditions. The optical microscope (OM) and scanning electron microscope (SEM) are used to examine the changes of the microstructure before and after the electropulsing treatment. The plasticity recovery degree of the titanium alloy sheet is studied using uniaxial tensile tests. Experimental results indicate that the plasticity of the specimens with 8% of pre-plastic deformation is nearly recovered completely by electropulsing treatment under certain conditions. Microcracks resulted from plastic deformation are healed, the local recrystallization occurs in the sheet metal after the electropulsing treatment. The research results show that the electropulsing treatment is an effective method to increase the forming limit of titanium alloy sheet. (c) 2007 Elsevier B.V. All rights reserved.