EFFECT OF INITIAL STRUCTURE AND COLD DEFORMATION ON THE STRESS – ELONGATION CURVE OF DUPLEX STAINLESS STEEL (α + γ) IN A STATIC TENSILE TESTING AT 850°C
Journal Title: Prace Instytutu Metalurgii Żelaza - Year 2018, Vol 70, Issue 4
Abstract
The results presented in the article concern the effect of structure and cold deformation on the behaviour of a high-alloy duplex stainless steel (a + c), grade X2CrNiMoN22-5-3, in tensile tests at 850°C at a rate vr = 15·10-3mm/s. Tests were carried out for a sheet after supersaturation from 1250 and 1350°C and subsequent cold rolling with the values of fh deformation within the range of 0.5–0.9. It was shown that the material undergoes superplastic flow, which is associated with the a → c + v transformation occurring at the tensile testing temperature. It was shown that the superplasticity effect depends on the initial structure and is greater for the material supersaturated from 1350°C as compared to 1250°C. This effect also increases with the increase of the cold deformation value of the sheet. It was proven that increasing cold deformation causes, after tensile testing at 850°C, an increase in the area fraction of the v phase inhibiting the austenite grain growth in the steel structure.
Authors and Affiliations
Krzysztof Radwański, Grzegorz Niewielski
Keywords
Related Articles
- EP ID EP481481
- DOI 10.32730/imz.0137-9941.18.4.3
- Views 60
- Downloads 0
Gender policy in higher education: problems of inequality and ways of solutions.
This article analyzes gender inequality in higher education of the country and represents the existing horizontal and vertical segregations. It presents the statistical differences concerning the gen...
EFFECT OF METALLURGIC PURITY OF THE 15CrMoV6-10-3 (15HGMV) STEEL ON TECHNOLOGICAL AND MECHANICAL PROPERTIES OF COLD-DEFORMED PRODUCTS
The subject of the article is the analysis of the impact of electro-slag remelting – ESR on the technological and mecha-nical properties of the 15HGMV steel. Uniaxial compression tests were carried out with the use of a...
APPROACH TO FERROMAGNETIC SATURATION FOR AMORPHOUS FE-BASED ALLOY
The paper presents the results of research on the structure and selected properties of magnetic alloys based on Fe. The alloy with the chemical composition Fe36Co36Y8B20 was produced using two methods: forcing and suckin...
IDENTIFICATION OF PHASE TRANSFORMATION MODEL FOR THE SIMULATION OF CONTROLLED COOLING OF BAINITIC STEEL TUBES
JMAK (Johnson-Mehl-Avrami-Kolmogorov) equation was adapted to simulation of phase transformations during cooling of bainitic steel tubes. The model was identified on the basis of the results obtained from the JMatPro sof...
RESIDUAL LIFE OF REPAIR WELDED JOINTS IN PIPELINES MADE OF 13HMF AFTER USE FOR THE DESIGN OPERATING TIME
This paper presents the results of material tests of repair welded joints carried out for samples of materials taken from high pressure steam pipelines after over 200,000 operating hours in creep conditions, made of the...