Mössbauer spectroscopy and Rietveld refinement used to analyze stainless steel properties regarding shape memory effect (SME)

The resonant absorption of recoilless g-rays, known as Mössbauer Spectroscopy, is an efficient nuclear prospecting technique to structural and magnetic analysis. When studying steels, it possible accurately analyze the surface materials using Conversion Electron Spectroscopy (CEMS) that evaluates sample’s a depth 200 nm, by X-ray (CXMS), which can go deeper investigate inner layers steel samples (10 mm). In this work, was employed study crystallographic reversion (f.c.c.àh.c.p.) stainless shape memory. A hexagonal martensitic phase induced mechanically through compression test austenite observed heat treatment. spectroscopy measurements were carried out conversion electrons, with 57Co source in rhodium matrix at room temperature without external fields. Spectra analyzed specific adjustment software. results indicated great reversal e-martensite. Rietveld refinement analysis obtained XRD data evaluate changes occurring during thermo-mechanical treatment (cycles deformation followed heating). Comparison spectra are important for understanding phase. case, crystal structure resulted recovery material, deformed beyond its elastic limit.