Microstructure and Texture Development during Cold Rolling in UNS S32205 and UNS S32760 Duplex Stainless Steels

Abstract

In the present study, microstructure and texture evolution during cold rolling in UNS S32205 and UNS S32760 duplex stainless steel was investigated. Both steels were unidirectionally cold rolled up to 80 pct thickness reduction. Scanning electron microscopy and electron backscattered diffraction (EBSD) were used for microstructural characterization, while X-ray diffraction (XRD) was used for the measurement of bulk texture. Strain-induced martensite (SIM) was identified and quantified with the help of magnetic measurements (B-H curve and magnetization saturation). With the increase in plastic strain, the grains became morphologically elongated along the rolling direction with the reduction in average band thickness and band spacing. SIM increased with the increase in deformation and was found to be a function of strain and the SFE of austenite. The increase in SIM was much more pronounced in UNS S32205 steel as compared to UNS S32760 steel. After cold rolling, strong a-fiber (RD//h110i) texture was developed in ferrite, while brass texture was dominant in austenite for both steels. The strength of texture components and fibers was stronger in UNS S32760 steel. Another significant feature was the development of weak c-fiber (ND//h111i) in UNS S32760 steel at intermediate deformation.

Controlled cold rolling effect on microstructure and mechanical properties of Ce-modified SAF 2507 super duplex stainless steel

“…In order to further improve the surface processing quality and precision of SDSS workpieces, cold rolling process has been widely used in industrial practice because of its high dimensional precision, good surface quality, high strength and hardness [21]. Most of the reports are focused on the microstructure and mechanical properties of SDSS after cold rolling of SAF 2205 SDSS [22][23][24] except a few reports on SAF 2507 SDSS. Though hot workability was scarcely reported for the rare earth Ce modified SAF 2507 SDSS [14,25], microstructure and mechanical properties remain unknown for the cold rolled SDSS.…”

Microstructural Evolution Induced Mechanical Property Enhancement in Cryogenically Rolled Ce‐Modified SAF2507 Super Duplex Stainless Steel

“…This suggests that the transformation is possible only because of the significant suppression of dynamic recovery at the cryogenic temperature. [26][27][28] Thus, during the process of deformation, large amounts of dislocations and stacking faults are formed followed by the nucleation and growth of strain-induced martensite. Furthermore, the large strain applied during various levels of deformation leads to the continuous generation of twins followed by interaction between different orientation twins, which provides a large number of locations for the nucleation and continuous growth of martensite.…”

Strain Rate Sensitivity Behaviour of a Chrome-Nickel Austentic-Ferritic Stainless Steel and its Constitutive Modelling

“…The accuracy of the developed model was calculated for the flow stress data at various strains from 0.05 to 0.7 at the strain interval of 0.05 from the Eqs. ( 27) and (28). The comparison between experimental and predicted flow stress is shown in Fig.…”

“…The substructure development/shear bands was reported to be observed in the austenite grains even at very low cold rolling percent. 28,29) In contrast, at high temperatures, the ferrite was softer than the austenite. 15) Initially at low deformation levels, the strain was mostly accommodated by ferrite.…”

“…............ (28) where N is the total number of data points, E i is the experi-mental value of flow stress from flow curves, P i is the predicted value of flow stress from the constitutive model, E̅ and P̅ are the average values of E i and P i , respectively. The accuracy of the developed model was calculated for the flow stress data at various strains from 0.05 to 0.7 at the strain interval of 0.05 from the Eqs.…”