A Study on the Residual Stress of the Co-Based Alloy Plasma Cladding Layer

Abstract

The distribution law of residual stress in multi-channel scanned plasma cladding of Co-based alloy under different process parameters was studied by means of simulation and tests, and the optimum process parameters were optimized. The simulation model of the plasma cladding stress field was established by ABAQUS software, and the influence law of the working current, scanning speed, and scanning mode on the residual stress of the Co-based alloy multi-channel scanning was studied. A set of optimal cladding process parameters were obtained. The residual stress of the cladding layer was measured by the blind hole method and compared with the stress value in the finite element model. The results show that there is residual tensile stress on the surface of the cladding layer. The residual stress along the direction of the scanning path is greater than that along the direction of the scan sequence. The residual stress increases with the increase of the working current. The scanning speed is greater, and the residual stress is smaller. The residual stress of the short-edge scanning is greater than that of the long-edge scanning. The residual stress of the successive scanning is greater than that of the reciprocating scanning. The long-edge reciprocating scanning is the best scanning mode. The best combination of process parameters is the working current of 90 A, the scanning speed of 100 mm/min, and the long-edge reciprocating scanning mode.

Fatigue Life and Residual Stress of Flat Stainless Steel Specimens Laser-Cladded with a Cobalt-Based Alloy and Postprocessed with Laser Shock Peening

“…At greater depth, peak tensile residual stress values of 150 MPa and 125 MPa are observed on the specimens without and with LSP, respectively. Residual tensile stress values close to 100 MPa have already been reported for Co-based alloy plasma cladding layers [37]; in that research, the authors found that, due to the material deposition and cooling rate, residual tensile stresses up to 125 MPa were generated. A comparison between the experimental residual stress results obtained by the contour method and those predicted by the LSP finite element simulation is presented in Figure 11, where good agreement between the experimental and numerical predicted results is observed, especially in the region 0.5 mm-1.1 mm from the surface.…”

“…The values for the parameters of the above equation are shown in Table 4. To determine the values of these parameters, the Uniform Material Law correlation, proposed in the literature [35][36][37], was used. To calculate these parameters, the ultimate stress value of Stellite 6 and SS 304 [26,27] was used.…”

Effect of ultrasonic vibration on residual stress in plasma cladding of iron-based alloy

“…The component perpendicular to the Y direction of the scanning path is defined as σ y . The calculation formulas of residual stress σ x , σ y are as follows (Lai et al, 2022).…”

“…The local heat input during the cladding process, on the other hand, might generate a non-uniform temperature field distribution. Local thermoplastic deformation and residual strains are unavoidable in the melt pool and surrounding region under fast cooling and heating process conditions (Artaza et al, 2020;Lai et al, 2022). According to research, the efficiency of residual stress management can approach bottleneck limitations when process factors such as welding speed and current are employed optimally.…”

Analysis of the structure and properties of Ni-based alloys on the surface of 42CrMo steel with plasma cladding

“…Most scholars focused on the simulation of jets and the simulation of stress in the cladding process [22]. For example, making use of both simulation and experiment, scholars [23] discovered the law of residual stress distribution of plasma cladding Co-based alloy, which can reduce the probability of occurrence of cracks effectively. Fang [24] simulated the electrical discharge process of the plasma based on completely non-equilibrium uid model.…”