Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7176278 | Journal of Materials Processing Technology | 2018 | 24 Pages |
Abstract
The newly developed quenching and partitioning (QP) steel QP980 and boron alloyed martensitic steel B1500HS were butt-welded using fiber laser at a constant laser power 4.5â¯kW and various welding speeds of 4â¼10â¯m/min. Retained austenite was measured in the super-critical HAZ of B1500HS (0.9%), inter-critical HAZ of B1500HS (3.4%) and inter-critical HAZ of QP980 (0.6%), while the sub-critical HAZ of QP980 witnessed decomposition of retained austenite from 8.4% to 4.4%. The joints welded at 4â¯m/min achieved the highest tensile strength, while the significantly softened HAZ of the B1500HS was the weakest region. The dissimilar joint welded at 6â¼8â¯m/min fractured at the base metal of QP980, which were preferred as more crash energy can be absorbed. However, the Erichsen values of these welded joints (â¼4.06â¯mm) significantly decreased compared with the base metal of B1500HS (7.46â¯mm) and QP980 steel (8.67â¯mm), as the crack propagated along the softened HAZ of B1500HS.
Related Topics
Physical Sciences and Engineering
Engineering
Industrial and Manufacturing Engineering
Authors
Qiang Jia, Wei Guo, Zhandong Wan, Yun Peng, Guisheng Zou, Zhiling Tian, Y. Norman Zhou,