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经激光表面淬火预处理后的40Cr钢,进行预置QCr0.5中间层的超塑性焊接研究。结果表明,经激光淬火预处理后的40Cr钢与QCr0.5中间层待焊接面经仔细清洗,在预压应力56.6MPa、初始应变速率2.5×10-4s-1、焊接温度750～800℃的条件下,经120～180s短时压接,即可实现二者的超塑性连接,接头强度达QCr0.5母材强度,胀大率不超过6%。当预置中间层厚度小于2.5mm时,接头强度明显高于40Cr/QCr0.5超塑性焊接的。在焊接过程中,接头区界面两侧发生了明显的原子互扩散;QCr0.5铜合金发生了超塑性流变。
The 40Cr steel pretreated by laser surface quenching was used to study the superplastic welding of the preset QCr0.5 intermediate layer. The results show that the surface to be welded of 40Cr steel and QCr0.5 intermediate layer pretreated by laser quenching is carefully cleaned. The pre-compression stress is 56.6MPa, the initial strain rate is 2.5 × 10-4s-1, the welding temperature is 750-800 ℃ Under the conditions, after a short press of 120-180s, the superplastic connection between the two can be realized. The joint strength reaches the strength of the base metal of QCr0.5, and the swelling ratio does not exceed 6%. When the preset thickness of the middle layer is less than 2.5mm, the joint strength is significantly higher than 40Cr / QCr0.5 superplastic welding. During the welding process, obvious atomic mutual diffusion occurred on both sides of the interface of the joint area; superplastic rheology occurred in the QCr0.5 copper alloy.