Effect of Laser Welding on Formability of DP980 steel
Effect of Laser Welding on Formability of DP980 steel
复制标题
DOI：
10.1115/1.2969246
复制
发表时间：
2008-10
影响因子：
1.2
通讯作者：
N. Sreenivasan;M. Xia;S. Lawson;Y. Zhou
中科院分区：
文献类型：
--
作者：
N. Sreenivasan;M. Xia;S. Lawson;Y. Zhou
采用极限拱高（LDH）试验对双相980钢激光对焊板的成形性能进行了评价，并与母材进行了比较。使用两种不同的激光器：二极管和Nd：YAG，提供广泛的焊接热循环。由于在外部热影响区形成软化区，在焊接试样中观察到LDH急剧下降。软化带特征与LDH相关。较大的软化区导致LDH的较大减少。相对于轧制方向或冲头表面的焊接取向不影响成形性，因为软化区主导成形性行为。据观察，在单轴和双轴应变测试中，断裂发生在焊接样品的软化区中，该软化区始终比最小硬度的位置稍微远离焊缝中心线。DOI：10.1115/1.2969246
Limiting dome height (LDH) tests were used to evaluate the formability of laser butt welded blanks of the dual phase 980 steel in comparison with the base metal. Two different lasers were used: diode and Nd:YAG, giving a wide range of welding thermal cycles. A sharp decrease in LDH was observed in the welded specimens due to the formation of a softened zone in the outer heat affected zone. Softened zone characteristics were correlated with the LDH. Larger softened zones led to a larger reduction in the LDH. The welding orientation relative to the rolling direction or to the punch surface did not influence the formability, as the softened zone dominated the formability behavior. It was observed that in both uniaxial and biaxial strain tests, the fracture occurred in the softened zone of the welded samples consistently slightly farther out from the weld centerline than in the location of the minimum hardness. DOI: 10.1115/1.2969246