研究了焊丝中添加孕育剂Ti, Zr对2219 Al--Cu合金MIG焊缝组织和性能的影响。实验结果表明, 当焊丝中Ti, Zr添加量分别为0.26%和0.33%时, 整个焊缝形成了全部等轴晶组织, 并且沿晶界分布的共晶相的数量减少, 显著提高了焊缝金属的抗拉强度和延伸率。在焊缝金属中, Ti, Zr以金属间铝化物质点的形式提供非均质形核的核心, 促进了均匀、细小的等轴晶粒的形成。
The microstructure and toughness of the coarse--grained heat-affected zone (CGHAZ) in laser welding of RPC (relaxation--precipitation controlling transformation) steel were investigated by thermal simulation with a Gleeble-1500 thermal simulator. The influence of the time cooled from 800-500℃, t8/5 (0.3-30 s), on the microstructure of CGHAZ and the low temperature toughness were discussed. The experimental results indicate that the granular bainite is the dominate microstructure of the CGHAZ in laser welding of RPC steel, and the impact energy of the CGHAZ is much higher than that of base metal when t8/5 is between 3 s and 8 s. Considering the effect of the size, volume, number and shape of the M-A constituent on the toughness, a toughness factor of the M-A constituent is defined. As the toughness factor increases, the toughness of the granular bainite increases. The varied trend of the impact toughness with t8/5 is mainly determined by the toughness factor of the M-A constituent.
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| [1] | |
| [2] | |
| [3] | |
| [4] | |
| [5] | |
| [6] | |
| [7] | |
| [8] | |
| [9] | |
| [10] | |
| [11] | |
| [12] | |
| [13] |
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