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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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应变速率对DP780钢激光焊接接头动态变形行为的影响
DOI: 0.3724/SP.J.1037.2013.00341, PP. 1493-1500
Keywords: 激光焊接,双相钢,动态载荷,应变速率,变形行为
Abstract:
研究了应变速率对DP780钢激光焊接接头的拉伸性能及变形行为的影响规律和机制.结果表明,与母材相比,DP780钢激光焊接接头的变形行为对应变速率更敏感.随应变速率的增加,DP780钢激光焊接接头的强度提高,塑性呈现整体下降趋势.在较低应变速率(<101s-1)条件下,随应变速率增加,焊接接头的强度有所提高,但变化幅度不大,塑性降低较明显;当应变速率超过101s-1后,强度的提高幅度增大,而塑性在应变速率101—102s-1范围内有所恢复后再降低.DP780钢激光焊接接头拉伸变形过程中宏观力学行为的应变速率敏感性主要取决于DP780钢母材在不同应变速率下变形行为及机制的改变.随应变速率的增加,DP780钢激光焊接接头断裂位置距焊缝中心线的距离显著降低,断裂位置由母材区转移至热影响区的软化区.动态载荷下,DP780钢激光焊接接头不同区域组织塑性变形行为应变速率依存性存在差异,是焊接接头断裂位置表现出明显应变率效应的本质原因.
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