Abstract
The effect of spinning and subsequent heat-treatment on mechanical performance and microstructure evolution has been investigated extensively. Thin-wall tube of 18Ni Co-free Maraging steel (T250) prepared by forward spinning process emerges obvious radial shrinkage behavior after heat-treatment and the magnitude of the shrinkage induced by solution is almost the same as that by aging. Microstructure investigation shows that the residual stress and stain induced by spinning process and reversed austenite forming during aging might have the similar contribution to the radical shrinkage phenomenon. Solution treatment resulted in a drastically refined grain and recrystallised in microstructure, removing the effect of plastic deformation and improving hardness. Subsequent aging obtained a tempered microstructure, enhancing hardness strikingly for precipitation strengthening.
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