梯度层对YG6/40Cr钢钎焊接头强度的影响

Influence of gradient layer on the soldered joint strength of YG6 hard alloy and 40Cr steel

采用粉末叠层法制备了梯度层,以该梯度层作为缓解接头残余应力的中间层材料,选用CuMnNi钎料,在1 040℃,15 min的工艺参数条件下,对YG6硬质合金和40Cr钢进行了钎焊试验。结果表明,采用梯度层作为缓解应力的中间层材料,可以明显减小钎焊接头的内应力,大幅提高了接头的强度;采用B梯度层接头强度达656 MPa。梯度层的层数对接头强度有明显的影响,梯度层厚度相同的情况下,层数越多其缓解内应力能力越高,接头强度越高。

The gradient layer which prepared by powder lamination method was used as the interlayer material to relieve the residual stress of the joint.The solder test on 40Cr steel and YG6 hard alloy was conducted under the condition that brazing temperature was 1 040 ℃ and time duration was 15 min.by selecting CuMnNi brazing filler metal.The results showed that the internal stress of the welding joint would be reduced obviously while its strength was increased significantly by using gradient layer as the interlayer material to relieve the residual stress.The joint strength was up to 656 MPa when gradient layer B was used.The number of gradient layers had obvious effect on the strength of soldered joints.Under the condition that the thickness of the gradient layer was the same,the more the number of the layers,the higher the ability to relieve the internal stress,and the higher the joint strength.