Yb:YAG laser welding of TRIP780 steel with dual phase and mild steels for use in tailor welded blanks
Yb:YAG laser welding of TRIP780 steel with dual phase and mild steels for use in tailor welded blanks
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DOI：
10.1016/j.matdes.2009.04.033
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发表时间：
2009-12
影响因子：
8.4
通讯作者：
R. S. Sharma;P. Molian
中科院分区：
文献类型：
--
作者：
R. S. Sharma;P. Molian
先进高强度钢（AHSS）是满足车辆安全性和燃油效率要求的关键。本文介绍了TRIP 780和DP 980两种AHSS钢的激光焊接结果。使用2kW Trumpf TRUDISK 6002®Yb：YAG激光束将1 mm厚的TRIP 780与1.5mm厚的DP 980和1 mm厚的低碳钢接合。采用光学金相技术对焊缝形貌和显微组织进行了表征。进行显微硬度、拉伸和疲劳测试以评估机械性能。结果表明，激光焊缝具有良好的强度和硬度，缺陷很少，这归因于高光束质量，圆盘式激光器。此外，TRIP 780钢的预应变对能量吸收有明显的影响。
Advanced high strength steels (AHSS) are essential to meet the demands of safety and fuel efficiency in vehicles. In this paper, we present the results of laser welding of two AHSS steels, TRIP780 and DP980. A 2kW Trumpf TRUDISK 6002®Yb:YAG laser beam was utilized to join 1mm thick TRIP780 with 1.5mm thick DP980 and 1mm thick mild steel. Optical metallography was used to characterize the weld profile and microstructures. Microhardness, tensile and fatigue tests were performed to evaluate the mechanical properties. Results indicate that the laser welds exhibit excellent strength and hardness with minimal defects which are attributed to the high beam quality, disk type of laser. In addition, there is a distinct effect of pre-straining of TRIP780 steels on the energy absorption.