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对40Cr待焊接面的表层实施激光淬火的组织超细化预处理后,将其与QCr0.5在焊接温度750~800℃、初始应变速率(2.5~5)×10-4s-1、预压应力56.6~84.9 MPa、焊接时间120~180 s的条件下,可实现二者异材的固态焊接,接头强度能够达到QCr0.5母材的强度。焊后对接头区的显微组织观测表明,焊接接头区的界面两侧显微组织连续,已经实现了良好的冶金结合;界面两侧近界面处的组织因C、Cr、Cu原子的扩散而发生了明显变化。
The surface of 40Cr to be welded surface laser quenching microstructure pretreatment, with the QCr0.5 at a welding temperature of 750 ~ 800 ℃, the initial strain rate (2.5 ~ 5) × 10-4s-1, the pre-press Stress 56.6 ~ 84.9 MPa, welding time 120 ~ 180 s under the conditions of the two materials can be achieved by solid-state welding, joint strength can reach the strength of the base material QCr0.5. The microstructure observation of the butt joint area after welding shows that the microstructures on both sides of the weld joint area are continuous and good metallurgical bonding has been achieved. The microstructure near the interface on both sides of the interface due to the diffusion of C, Cr and Cu atoms Significant changes have taken place.