The Role of Dislocations in the Superplastic Deformation of a Duplex Stainless Steel

1990 ◽  
Vol 196 ◽  
Author(s):  
T. R. Parayil ◽  
G. L. Dunlop ◽  
P. R. Howell
Keyword(s):  
Stainless Steel ◽  
Duplex Stainless Steel ◽  
Interphase Boundary ◽  
Superplastic Deformation ◽  
Transmission Electron ◽  
Dislocation Arrays ◽  
Boundary Sliding ◽  
Region Ii ◽  
Dislocation Multiplication

ABSTRACTTransmission electron microscopy (TEM) has been employed to examine the role of dislocations in the superplastic deformation of a duplex stainless steel. In particular, matrix, grain boundary and interphase interface dislocation distributions have been documented after testing in region II. It is concluded that dislocation activity is of importance during superplastic flow and both loop sources and dislocation pile-ups have been observed. The presence of highly distorted dislocation arrays also suggests that grain and interphase boundary sliding is intimately linked to the motion of grain and interphase boundary dislocations. Finally, it is argued that dislocation multiplication in interphase interfaces can involve the operation of loop sources.

Role of microstructure on corrosion of duplex stainless steel in presence of bacterial activity

2010 ◽  
Vol 52 (4) ◽  
pp. 1404-1412 ◽  
Author(s):  
P.J. Antony ◽  
R.K. Singh Raman ◽  
R. Raman ◽  
Pradeep Kumar
Keyword(s):  
Stainless Steel ◽  
Duplex Stainless Steel ◽  
Bacterial Activity

Microstructure, Texture, Mechanical and Corrosion Performance of the Stainless Duplex Steel UNS S32205 Submitted to Warm Rolling

2018 ◽  
Vol 941 ◽  
pp. 118-123
Author(s):  
Dagoberto Brandão Santos ◽  
Raphael França Assumpção ◽  
Daniela Barçante Perasoli ◽  
Dalila Chaves Sicupira
Keyword(s):  
Tensile Strength ◽  
Stainless Steel ◽  
Corrosion Resistance ◽  
Duplex Stainless Steel ◽  
Warm Rolling ◽  
Optical Scanning ◽  
Transmission Electron ◽  
Duplex Steel ◽  
Hot Rolled ◽  
Chlorine Ion

The UNS S32205 duplex stainless steel was warm rolled at 600°C with 60 and 80% of thickness reduction. The microstructure was characterized by optical, scanning and transmission electron microscopy, X-ray diffractometry and EBSD. The corrosion resistance was evaluated by electrochemical behavior in the chlorine ion environment using potentiodynamic polarization measurements. The tensile strength reached 1185 MPa and 1328 MPa, after warm rolling with 60 and 80%, respectively. In steel as-supplied, hot rolled and annealed, the tensile strength was 774 MPa. Ferrite microtexture presented the α-fiber and the rotated cube component, while the austenite enhanced the brass, copper, and cube components to a lesser extent. The substructure was characterized by intense formation of tangles and forests of dislocations and discrete subgrains in the ferritic phase and by planar gliding of dislocations and formation of dense dislocations walls in the austenite. Despite the existence of a certain similarity among the values of pitting potentials obtained for all samples, the number of pits observed was higher in the as-received sample, followed by the samples with 60 and 80% reduction. These results draw attention to innovative routes in the industrial production of duplex stainless steel of this class, even considering ductility lost. Keywords: Warm rolling; Mechanical strength; Texture; Substructure; Corrosion resistance

Effect of Interphase Boundary Character on Mechanical Properties in NiAl(β) Bicrystals with Ni 3Al(γ') Precipitates along Grain Boundary

2002 ◽  
Vol 753 ◽  
Author(s):  
Toshiya Sakata ◽  
Hiroyuki Y. Yasuda ◽  
Yukichi Umakoshi
Keyword(s):  
Mechanical Properties ◽  
Interphase Boundary ◽  
Fracture Stress ◽  
Room Temperature ◽  
Tensile Deformation ◽  
Deviation Angle ◽  
Boundary Character ◽  
Temperature Fracture ◽  
Boundary Sliding

ABSTRACTRole of the crystallography of Ni 3Al(γ') precipitates along grain boundaries of NiAl(β) in the mechanical properties was systematically investigated using β bicrystals with controlled orientations. γ' phase preferentially precipitated along βgrain boundaries showing a film-like shape. The selected variant of γ'-film satisfied the Kurdjumov-Sachs (K-S) relation with a neighboring βcrystal but it deviated from the relation with another adjacent βcrystal. In the course of tensile deformation at room temperature, fracture occurred preferentially at incoherent (β/γ') interphase boundary deviating from the K-S relation and the fracture stress decreased with increasing deviation angle. In contrast, the interphase boundary sliding occurred preferentially at irrational (β/γ') interface at 1073K. The sliding displacement increased with increasing deviation angle. Thus, the mechanical properties of β bicrystals with γ'-film were found to depend strongly on the interphase boundary character.

Role of Recovery and Recrystallization on the Post Cold Work Corrosion Performance in a Super Duplex Stainless Steel

2020 ◽  
Vol 167 (10) ◽  
pp. 101501
Author(s):  
Riya Mondal ◽  
Sunil Kumar Bonagani ◽  
Parvej Raut ◽  
P. V. Sivaprasad ◽  
G. Chai ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Duplex Stainless Steel ◽  
Cold Work ◽  
Super Duplex Stainless Steel ◽  
Corrosion Performance

Microstructural Evolution in 2101 Lean Duplex Stainless Steel During Low- and Intermediate-Temperature Aging

2016 ◽  
Vol 22 (2) ◽  
pp. 463-473 ◽  
Author(s):  
Jean-Yves Maetz ◽  
Sophie Cazottes ◽  
Catherine Verdu ◽  
Frédéric Danoix ◽  
Xavier Kléber
Keyword(s):  
Stainless Steel ◽  
Duplex Stainless Steel ◽  
Microstructural Evolution ◽  
Atom Probe Tomography ◽  
Isothermal Aging ◽  
Room Temperature ◽  
Atom Probe ◽  
Lean Duplex Stainless Steel ◽  
Transmission Electron ◽  
Temperature Aging

AbstractThe microstructural evolution of a 2101 lean duplex stainless steel (DSS) during isothermal aging from room temperature to 470 °C was investigated using thermoelectric power (TEP) measurements to follow the kinetics, atom probe tomography, and transmission electron microscopy. Despite the low Ni, Cr, and Mo contents, the lean DSS was sensitive to α–α′ phase separation and Ni–Mn–Si–Al–Cu clustering at intermediate temperatures. The time–temperature pairs characteristic of the early stages of ferrite decomposition were determined from the TEP kinetics. Considering their composition and locations, the clusters are most likely G phase precursors.

Role of Vacancies and Solute Atoms on Grain Boundary Sliding

1999 ◽  
Vol 601 ◽  
Author(s):  
J.S. Vetrano ◽  
C.H. Henager ◽  
E.P. Simonen
Keyword(s):  
Grain Boundary ◽  
Solute Atom ◽  
Vacancy Concentration ◽  
Grain Boundary Sliding ◽  
Fine Grained ◽  
Grain Boundary Plane ◽  
Transmission Electron ◽  
Boundary Sliding ◽  
Solute Atoms

AbstractIt is necessary for grain boundary dislocations to slide and climb during the grain boundary sliding process that dominates fine-grained superplastic deformation. The process of climb requires either an influx of vacancies to the grain boundary plane or a local generation of vacancies. Transmission electron microscopy (TEM) observations of grain boundaries in superplastically deformed Al-Mg-Mn alloys quenched under load from the deformation temperature have revealed the presence of nano-scale cavities resulting from a localized supersaturation of vacancies at the grain boundary. Compositional measurements along interfaces have also shown an effect of solute atoms on the local structure. This is shown to result from a coupling of vacancy and solute atom flows during deformation and quenching. Calculations of the localized vacancy concentration indicate that the supersaturation along the grain boundary can be as much as a factor often. The effects of the local supersaturation and solute atom movement on deformation rates and cavity nucleation and growth will be discussed.

Superplastic Deformation of a Duplex Stainless Steel

2001 ◽  
Vol 357-359 ◽  
pp. 199-204
Author(s):  
D. Pulino-Sagradi ◽  
R.E. Medrano ◽  
A.M.M. Nazar
Keyword(s):  
Stainless Steel ◽  
Duplex Stainless Steel ◽  
Superplastic Deformation
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