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Residual stresses evolution and process route optimization of TC4 profiled rolled rings incorporating thermal bulging

Lv Nan, Liu Dong, Wang Jianguo, Rao Haodong, Nan Jungang

Archives of Civil and Mechanical Engineering

2023

Vol. 23, no. 3

art. no. e200, 2023

The thermal processing of rolled rings inevitably generates and accumulates massive residual stresses, as quenching residual stresses produced by water cooling treatment. Non-uniformly distributed residual stresses would seriously affect the structural strength, dimensional stability and service life of the component. In the traditional rolling process of titanium alloy rings, the quenching residual compressive stresses introduced by solution treatment could reach – 400–600 MPa, for which effective control of the stresses is an urgent issue to be solved. In this research, the stress control efficiency of rolling rings under different process routes was explored according to the thermal bulge stress relief technique. The FEM model of the stress evolution in the whole process of the rolled ring was established. The residual stresses on the ring surface are characterized by the hole-drilling method, while the microstructures are characterized by electron backscatter diffraction. The results indicated that the optimized process incorporating the thermal bulging stress relief technique reduced the levels of stress values to within about ± 50 MP and the stress homogenization index by approximately 60–90%.

Modelowanie kucia przedkuwki pierścieni i obręczy walcowanych

Sińczak J., Madej W.

Obróbka Plastyczna Metali

1998

T. 9, nr 2

5-12

Dokonano analizy procesu spęczania wsadu stosowanego na odkuwki przebijane. Analizę przeprowadzono w oparciu o symulację komputerową z wykorzystaniem programu FORM 2D. Stwierdzono, że główną przyczyną pojawiania się pęknięć na powierzchni bocznej pierścieni jest nakładanie się niekorzystnych zjawisk, tj. strefy kryształów o rozluźnionej strukturze powstałej w czasie krzepnięcia wlewka i obniżonej plastyczności strefy zimnych końców przy spęczaniu.

Upsetting of a preform for pierced forging was analized. The analyse was carried out through computer simulation using program FORM 2D. There was stated that the main reason of cracks on side surface of a ring was a superposition of unfavourable phenomena i. e. the crystal zone of loose structure created during ingot solidification and the plasticity reduction of cold zone by upsetting.