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摘要
Crack compliance method (CCM), X-ray diffraction analysis, scanning electron microscopy (SEM), transmission electron microscopy (TEM) and Vickers hardness tester were used to study the changes of internal microstructure and residual stress of 700L high strength steel after tempering and warm deformation at different temperatures. The results show that compared to tempering, the warm deformation can promote the precipitation of carbides of the 700L high strength steel. With the increase of the warm deformation temperature, the overall residual stress of the 700L high strength steel decreases continuously. During warm deformation at 100-300℃, the residual stress decreases rapidly, and the residual stress of the 700L high strength steel after warm deformation at 300℃ decreases to 34.77%. During warm deformation at 300-600℃, the residual stress decreases slowly, and the residual stress of the 700L high strength steel after warm deformation at 600℃ decreases to 20.83%. The regulation of warm deformation on residual stress is significant. The high temperature deformation can also reduce the surface tensile stress level of the 700L high strength steel, improve its fatigue performance. ? 2021, Editorial Office of Transactions of Materials and Heat Treatment. All right reserved.
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