Journal
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
Volume 27, Issue 2, Pages 368-378Publisher
SPRINGER
DOI: 10.1007/s11665-017-3119-3
Keywords
bearing steel; cold ring rolling; dimensional distortion; microstructure evolution; residual stress
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Funding
- National Natural Science Foundation of China [51575414]
- China Postdoctoral Science Foundation [2017M612524]
- Important Science and Technology Innovation Program of Hubei Province [2015AAA005]
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This study investigates the correlation between the residual stress and distortion behavior of a cold-rolled ring from the annealing to quenching-tempering (QT) process. Due to the cold-rolled process, the external periphery of the bearing ring experiences a compressive residual stress. To relieve the residual stress, cold-rolled rings are annealed at 700 A degrees C which is higher than the starting temperature of recrystallization. When cold-rolled rings are annealed at 700 A degrees C for 15 min, the compressive residual stress is reduced to zero and the outer diameter of the annealed ring becomes larger than that of a non-annealed sample, which is unrelated to annealing time. Simultaneously, the roundness and taper deviation do not obviously change compared with those of non-annealed sample. The stress relaxation during the annealing process was attributed to the recovery and recrystallization of ferrite. Annealing has a genetic influence on the following QT heat treatment, wherein the lowest residual stress is in the non-annealed cold-rolled ring. From the annealing to QT process, the deviation of the outer diameter, roundness, and taper increased with annealing time, a large extend than that of non-annealed samples.
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