Title

REFINEMENT STRENGTHENING OF A NOVEL LOW COST-HIGH PROPERTIES AUSTENITIC STAINLESS STEEL VIATWIP/TRIP EFFECTS

Authorship

SONG, RENBO; SU, YANG; CAI, HENGJUN; WEN, JIAN; WANG, TIANYI; GUO, KE

SONG, RENBO

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SU, YANG

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CAI, HENGJUN

I am this author

WEN, JIAN

I am this author

WANG, TIANYI

I am this author

GUO, KE

I am this author

DOI

10.5151/2594-5327-33559

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Abstract

Controlling the phase reversion annealing process is commonly applied to deep cold-worked metastable austenitic to produce austenitic stainless steel with different types of austenite grain size from ultrafine grain to coarse grain and eliminating the work hardening. In this study, a novel low-cost Cr-Mn austenitic stainless steel (20LH5) is employed. After the phase reversion process, microstructures were observed by X-ray diffraction (XRD) and transmission electron microscopy (TEM). The results showed that annealing at 900 ℃+30 s can minimize the grain size to fine grain (FG: ~1 μm), which performed significant improvements in the mechanical properties with tensile strength ~1080 MPa, yield strength ~530 MPa and elongation rate ~47%, while annealing at 1100 ℃+30 s of the counterpart samples, the tensile strength is ~910 MPa, the yield strength is ~360 MPa and elongation rate is about 30% in the coarse grain (CG: ~7μm) stainless steel. The deformation mechanism of the FG mainly contributes to the TWIP effects while in CG the deformation mechanism mainly relies on the TRIP effects.

Keywords

Phase reversion; 20LH5 stainless steel; Deformation mechanism