High cycle fatigue properties of Ti-6Al-4V/304 clad plate with corrugated interface under the influence of multi-factor coupling

Abstract

In this study, the high cycle fatigue properties of Ti-6Al-4V/304 clad plate with corrugated interface prepared by asymmetric rolling local strong stress (ARLSS) process and flat interface clad plate prepared by traditional flat roll rolling were compared and analyzed. The results show that the high cycle fatigue performance of Ti-6Al-4V/304 clad plate with corrugated interface is significantly higher than that of flat interface due to the difference of microstructure. During the fatigue test, the fracture modes of the clad plates with different interface morphologies were consistent. The damage first initiated and expanded on the side of 304 stainless steel. When the fatigue fracture of 304 stainless steel occurred, the Ti-6Al-4V was subjected to large uniaxial tensile stress and followed by tensile fracture, and the interface is not a weak area where fatigue damage occurs. Through finite element simulation and microstructure analysis, the results show that the trough position of 304 stainless steel side bears large stress, and there is large plastic deformation accumulation under cyclic load, which leads to γ-α’ phase transformation, and the resulting stress concentration becomes the key factor for fatigue failure in this area. This study not only confirms the role of residual stress in improving the fatigue performance of clad plates, but also enhances our understanding of the fatigue behavior of corrugated interface clad plates. Furthermore, it provides a scientific basis for the design and application of clad plates, particularly in evaluating their durability under high-cycle fatigue loads.