Abstract
Tensile tests of original plate samples from three types of stainless steel metal bellows were performed at room temperature. The constitutive equations for the three hardening curves were obtained and fitted. The analysis results of the microstructure and fracture morphology of the tensile specimens show that the grain size of the plate with a high logarithmic–exponential hardening rate is uneven and the dimple of the shear fracture is elongated into an ellipse. By contrast, the grain size of the plate with a relatively low linear hardening rate is even and the dimple of the fracture is uniformly equiaxial. Finite element simulations of the hydraulic bulging and repeated limit bending deformation of the metal bellows of the three types of materials were also conducted. The repeated limit bending deformation process was tested experimentally. Although the effect of the hardening exponent on the residual stress of the metal bellows after hydraulic bulging is minimal, this exponent considerably influences the repeated limit bending deformation of the metal bellows after subsequent use. The trough hardening phenomenon is serious in the repeated limit bending process. Moreover, when the hardening exponent of the original plate is high, the resistance to bending fracture at the trough area is poor.
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This project is supported by National Natural Science Foundation of China (Grant No. 51775479) and Natural Science Foundation of Hebei Province, China (Grant No. E2017203046).
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Hao, Z., Luo, S., Zhao, H. et al. Effect of Plate Hardening Behavior on the Deformation of Stainless Steel Metal Bellows. J. of Materi Eng and Perform 26, 5385–5395 (2017). https://doi.org/10.1007/s11665-017-3013-z
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DOI: https://doi.org/10.1007/s11665-017-3013-z