Producing Nanostructured 304 Stainless Steel by Rolling at Cryogenic Temperature

Abstract

Effect of rolling temperature on deformation-induced α′-martensite and reverted austenite was investigated. Rolling experiments were carried out at room temperature (without inter-pass cooling) and at liquid nitrogen temperature, respectively. The phase components, orientations, and microstructures are characterized by X-ray diffraction, electron backscattered scattering detection, and transmission electron microscopy. The (200)_α′ martensite was found to be of the preferred orientation in sample rolled at cryogenic temperature. An average grain size of about 300 nm combined with high yield strength (∼1500 MPa) and good elongation (∼35%) was obtained by the cryogenic temperature rolling and 240 s annealing treatment.

Keywords:

• Cryogenic temperature rolling
• Grain refinement
• Mechanical performance
• Orientation

Notes

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