The results show that the peakhardness of pre-deformation sample is increased because of quantity increase and refinement of S phase.
结果表明，预变形可以提高合金的峰值硬度，合金峰值硬度的增加来自于S 相数目的增加和尺寸的减小；
2
The hardness of welded joints obtained by double-wire submerged arc welding is significantly better than that obtained by CO2 gas shielded. The peakhardness appears in the heat affected zone.
CO2气体保护焊接头的硬度值明显较双丝埋弧焊接头的硬度值高，硬度值在热影响区出现峰值。
3
With the increasing of ageing temperature, time is shortened reaching hardnesspeak.