Effects of Annealing Conditions on Recrystallization, Texture, and Average Normal Anisotropy Coefficient of a Niobium-Stabilized Ferritic Stainless Steel

2017 ◽  
Vol 88 (12) ◽  
pp. 1700214 ◽  
Author(s):  
Daniella Gomes Rodrigues ◽  
Cláudio Moreira de Alcântara ◽  
Dagoberto Brandão Santos ◽  
Tarcísio Reis de Oliveira ◽  
Berenice Mendonça Gonzalez
Keyword(s):  
Stainless Steel ◽  
Ferritic Stainless Steel ◽  
Recrystallization Texture ◽  
Anisotropy Coefficient ◽  
Normal Anisotropy ◽  
Annealing Conditions

scholarly journals Influencia de la anisotropia en la formabilidad de acero inoxidable 439

2019 ◽  
pp. 1-8
Author(s):  
Juan Manuel Salgado-Lopez ◽  
José Luis Ojeda-Elizarrarás ◽  
José Trinidad Pérez-Quiroz ◽  
Hector Javier Vergara-Hernández
Keyword(s):  
Stainless Steel ◽  
Ferritic Stainless Steel ◽  
Deep Drawing ◽  
Metallographic Analysis ◽  
Quantitative Chemical Analysis ◽  
Normal Anisotropy ◽  
Automotive Components ◽  
Steel Sheets ◽  
R Value

This work shows the influence of the normal anisotropy (“r” value) in the deep drawing of AISI 439 ferritic stainless steel sheets. In order to do so, quantitative chemical analysis, metallographic analysis, tensile mechanical properties, and the determination of the “r” value and the “n” value were carried out in two different AISI 439 steel sheets of two different suppliers. In recent years, this ferritic stainless steel has been applied in a deep drawing process of automotive components. In this way, it must be said that one of these ferritic stainless steel sheets cracked due to exhaustion of formability during deep drawing after few steps. On the other hand, the second ferritic stainless steel sheet showed neither cracking nor other type of defects. The results of the tests, which were carried out in this work, probed that the“r” value has a strong influence on the forming behaviour of ferritic steel during deep drawing. This information is very relevant because the AISI 439 standard does not consider the planar anisotropy or the strain hardening coefficient as relevant for designation, but this type of steel is being applied in many forming operations of different components.

Modification of the Recrystallization Texture by Means of Cross Rolling in Ferritic Stainless Steel Sheets

2004 ◽  
Vol 449-452 ◽  
pp. 113-116 ◽  
Author(s):  
Jong Heun Lee ◽  
Soo Ho Park ◽  
Moo Young Huh
Keyword(s):  
Stainless Steel ◽  
Ferritic Stainless Steel ◽  
Recrystallization Texture ◽  
Recrystallization Annealing ◽  
Deformation Model ◽  
Center Layer ◽  
Cross Rolling ◽  
Steel Sheets ◽  
Hot Band ◽  
Rolling Deformation

In order to optimize the recrystallization texture of ferritic stainless steel sheets, the crystallographic texture was modified by means of cross rolling. The as-received hot band displayed pronounced through-thickness texture gradients with a strong rotated cube orientation in the sheet center layer. After the conventional normal rolling, the strong initial texture was retained. Pronounced{001}<110> in the rolling textures led to the formation of {334}<483> in the final recrystallization texture. Cross rolling in the present work was performed by a 45° rotation of RD around ND. Cross-rolling led to a weakening of {001}<110> orienations. After recrystallization annealing the cross-rolled samples displayed stronger {111}//ND orientations. The orientation stability during the rolling deformation was tackled by means of Taylor deformation model.

Characterization of Plastic Anisotropy of AA5182-O Sheets During Prestraining and Subsequent Annealing

2018 ◽  
Vol 140 (8) ◽  
Author(s):  
Kaifeng Wang ◽  
Bonan Zhou ◽  
Jingjing Li ◽  
John E. Carsley ◽  
Yang Li
Keyword(s):  
Electron Backscatter Diffraction ◽  
Plastic Anisotropy ◽  
Rolling Direction ◽  
Anisotropy Coefficient ◽  
Normal Anisotropy ◽  
Aluminum Alloy 5182 ◽  
Annealing Conditions ◽  
R Value ◽  
Value Changes ◽  
Backscatter Diffraction

This paper described the effects of prestraining and annealing on plastic anisotropy (r-value) of aluminum alloy 5182-O sheets including two prestrain paths and two annealing conditions. During the prestraining and annealing processes, r-value changed depending on prestrain paths and annealing conditions. Although there were slight changes of the normal anisotropy coefficient, r¯, during prestraining and annealing processes, the planar anisotropy coefficient, Δr, increased significantly, especially for the uniaxial prestrain condition. This could accelerate the development of earing during a sheet forming operation. Also, the corresponding sheet textures in rolling direction (RD)/TD plane after prestraining and annealing processes were observed through electron backscatter diffraction (EBSD) analysis to explain the r-value changes, where the viscoplastic self-consistent (VPSC) model was used to correlate the determined texture to measured r-values. It is found that the sheet texture also had significant changes relating to the prestrain paths and annealing conditions resulting in varied r-values.

Influence of Nb-Ti Composition on Recrystallization of Ferritic Stainless Steel

2011 ◽  
Vol 702-703 ◽  
pp. 619-622
Author(s):  
Yi Qiao Yang ◽  
Yan Dong Liu
Keyword(s):  
Experimental Study ◽  
Stainless Steel ◽  
Ferritic Stainless Steel ◽  
Recrystallization Texture ◽  
Texture Evolution ◽  
Grain Morphology ◽  
Continuous Annealing ◽  
Recrystallization Process ◽  
Additional Amount ◽  
Equiaxed Grain

An experimental study of the microstructural and texture evolution attending recrystallization of Nb-Ti stabilized ferritic stainless steel is presented. Two specimens with different Nb-Ti compositions, TCS345 and B4003, have been selected for comparison. The result shows that, after annealing at 750 °C for 5min, the major orientation in the TCS345 specimen locates at {111}, microstructures presents an equiaxed grain morphology, whereas the texture in the B4003 is not typical recrystallization texture and remains weak, indicating recrystallization occur preferentially to the TCS345 sheet. And after continuous annealing at 850°C for 5 min, the texture in TCS345 remains stronger than in the B4003, indicating that the additional amount of Nb-Ti acts to significantly hinder the recrystallization process.

Influence of the Cold Rolling Reduction on the Texture Development and r-Value Anisotropy in Ti-Stabilized 18% Cr Ferritic Stainless Steel

2010 ◽  
Vol 160 ◽  
pp. 129-134 ◽  
Author(s):  
I. Jung ◽  
D. Chae ◽  
Bruno C. De Cooman
Keyword(s):  
Stainless Steel ◽  
Cold Rolling ◽  
Ferritic Stainless Steel ◽  
Texture Component ◽  
Recrystallization Texture ◽  
Rolling Reduction ◽  
Cold Reduction ◽  
Planar Anisotropy ◽  
Cold Rolling Reduction ◽  
Hot Band

Ti stabilized AISI 439 type 18% Cr ferritic stainless steel offers an attractive alternative for replacing Ni-containing austenitic steels. The influence of the cold rolling reduction on texture development and the planar anisotropy of Ti-stabilized 18% Cr ferritic stainless steel have been studied in order to find an optimized processing route to obtain improved formability properties. In the present study, both annealed and un-annealed hot strips were given different cold rolling reductions up to 86%, and recrystallization annealed. The recrystallization texture was analyzed by means of XRD. Tensile tests were carried out on cold rolled and annealed samples oriented in seven different directions to the rolling direction to evaluate the planar anisotropy in detail. The mean normal anisotropy rm increased with increasing cold reduction for both annealed hot band and un-annealed hot band. The planar anisotropy revealed a behavior related to the development of the recrystallization texture component in the annealed hot band and the texture component in the un-annealed hot band, with increasing cold reduction.

Microstructures and Hardness of CO2 Laser Welds in 409L Ferritic Stainless Steel

2010 ◽  
Vol 48 (04) ◽  
pp. 297-304 ◽  
Author(s):  
Jong Pan Kong ◽  
Tae Jun Park ◽  
Hye Sung Na ◽  
Jeong Kil Kim ◽  
Sang Ho Uhm ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Ferritic Stainless Steel ◽  
Co2 Laser ◽  
Laser Welds
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