scholarly journals The Influence of a Novel Inorganic-Polymer Lubricant on the Microstructure of Interstitial-Free Steel during Ferrite Rolling

Metals ◽  
2020 ◽  
Vol 10 (2) ◽  
pp. 178
Author(s):  
Ning Kong ◽  
Jie Zhang ◽  
Hongbo Li ◽  
Boyu Wei ◽  
David R. G. Mitchell
Keyword(s):  
Electron Backscatter Diffraction ◽  
Texture Evolution ◽  
Rolling Texture ◽  
Fiber Texture ◽  
Lubricating Oil ◽  
Interstitial Free ◽  
Shear Texture ◽  
Lubrication Performance ◽  
Ferrite Rolling ◽  
Very High

A novel polyphosphate lubricant was used and evaluated during hot (ferrite) rolling of an interstitial-free (IF) steel. The texture evolution of these rolled IF steels have been examined by means of X-ray diffraction (XRD) and electron backscatter diffraction (EBSD) measurements. The polyphosphate lubricant shows an improved lubrication performance in terms of the texture optimization compared with lubricating oil and with unlubricated conditions. The γ-fiber texture is enhanced, and less shear texture is produced. This microstructure is responsible for enhanced drawability of ferrite rolled IF steels. The very high thermal stability of the polyphosphate enabled its use at very high temperatures (from 700 to 800 °C). Rolling temperature exerted limited influence on the resulting rolling texture evolution. The polyphosphate lubricant stabilizes the surface texture and reduces the gradient of shear texture through the thickness. The in-grain shear bands are reduced significantly (48.5%) compared with the unlubricated condition. Measured grain orientations indicate that the favorable texture of {111}<112> along the γ-fiber is developed while the undesired α-fiber texture of {001}<110> is effectively suppressed.

scholarly journals Polycrystal Simulation of Texture-Induced Grain Coarsening during Severe Plastic Deformation

Materials ◽  
2020 ◽  
Vol 13 (24) ◽  
pp. 5834
Author(s):  
Chi Zhang ◽  
Laszlo S. Toth
Keyword(s):  
Plastic Deformation ◽  
Severe Plastic Deformation ◽  
Electron Backscatter Diffraction ◽  
Texture Evolution ◽  
Face Centered Cubic ◽  
Shear Texture ◽  
Grain Coarsening ◽  
Random Texture ◽  
Polycrystal Plasticity ◽  
Grain Fragmentation

During severe plastic deformation (SPD), there is usually extended grain fragmentation, associated with the formation of a crystallographic texture. The effect of texture evolution is, however, coarsening in grain size, as neighbor grains might coalesce into one grain by approaching the same ideal orientation. This work investigates the texture-induced grain coarsening effect in face-centered cubic polycrystals during simple shear, in 3D topology. The 3D polycrystal aggregate was constructed using a cellular automaton model with periodic boundary conditions. The grains constituting the polycrystal were assigned to orientations, which were updated using the Taylor polycrystal plasticity approach. At the end of plastic straining, a grain detection procedure (similar to the one in electron backscatter diffraction, but in 3D) was applied to detect if the orientation difference between neighboring grains decreased below a small critical value (5°). Three types of initial textures were considered in the simulations: shear texture, random texture, and cube-type texture. The most affected case was the further shearing of an initially already shear texture: nearly 40% of the initial volume was concerned by the coalescence effect at a shear strain of 4. The coarsening was less in the initial random texture (~30%) and the smallest in the cube-type texture (~20%). The number of neighboring grains coalescing into one grain went up to 12. It is concluded that the texture-induced coarsening effect in SPD processing cannot be ignored and should be taken into account in the grain fragmentation process.

Effect of Initial Texture on the Deformed Microstructure of IF Steel

2007 ◽  
Vol 558-559 ◽  
pp. 1395-1400
Author(s):  
Jun Yun Kang ◽  
Brigitte Bacroix ◽  
Kyu Hwan Oh ◽  
Hu Chul Lee
Keyword(s):  
Texture Evolution ◽  
Rolling Texture ◽  
Small Strain ◽  
Deformation Texture ◽  
Fiber Texture ◽  
Orientation Dependence ◽  
If Steel ◽  
Misorientation Distribution ◽  
Steel Sheets ◽  
Initial Texture

The development of deformation texture and microstructure was examined for four different initial textures. IF steel sheets with a majority of α-, ε-, and γ-fiber and near random texture were prepared and cold rolled. The specimens exhibited characteristic behaviors in rolling texture evolution and deformation-induced misorientation development, according to their initial textures, especially at small strain levels. Due to the orientation dependence of intra-granular misorientation accumulation, the different texture evolutions affected the induced misorientation distribution. A larger fraction of γ-fiber orientations was related to more prominent misorientation development, while the initial texture stability simultaneously affected the misorientation development. The unstable, initial ε-fiber texture showed a stronger tendency of misorientation accumulation than the stable α-fiber during the subsequent cold rolling.

Application of Recrystallization Texture Evolution Model to Predict Plastic Formability in Steel Strips

2014 ◽  
Vol 783-786 ◽  
pp. 1954-1960
Author(s):  
Toshiharu Morimoto ◽  
Y. Fuyuki ◽  
A. Yanagida ◽  
Jun Yanagimoto
Keyword(s):  
Recrystallization Texture ◽  
Texture Evolution ◽  
Steel Strip ◽  
Rolling Texture ◽  
Interstitial Free ◽  
If Steel ◽  
Taylor Model ◽  
Steel Strips ◽  
Cold Rolled ◽  
Hot Rolled

T.M.C.P.(Thermo Mechanical Control Processing) has been widely used to improveplastic formability in steel strips. We have produced interstitial free steel(IF steel) strips and ferriticstainless-steel strips through T.M.C.P. rolling method. Optimizing conditions of hot rolling, hotrolled annealing, cold rolling and cold rolled annealing, we developed texture prediction model. Wecan predict rolling texture accurately using the conventional Taylor model. Moreover, we preciselypredict recrystallization texture classifying the total number of microscopic􀀁 slips which arecalculated using the Taylor model. We consider that these calculated results provednucleation-oriented model and two types of recrystallization and grain growth mechanisms exit inour studies. One mechanism is that grains which had the small total number of microscopic slips arepreferred orientation for the hot rolled and annealed ferritic stainless-steel strip. The othermechanism is that grains which had the high total number of microscopic slips are preferredorientation for the cold rolled and annealed IF steel strip.

Effects of Lubrication in Ferrite Rolling of Interstitial Free Steel

2013 ◽  
Vol 773-774 ◽  
pp. 186-191 ◽  
Author(s):  
Ning Kong ◽  
Kiet Tieu ◽  
Hong Tao Zhu ◽  
Qiang Zhu ◽  
Peter Gandy
Keyword(s):  
Solid Lubricant ◽  
Rolling Force ◽  
Steel Strip ◽  
Lubricating Oil ◽  
Interstitial Free ◽  
Strip Surface ◽  
Interstitial Free Steel ◽  
Ferrite Rolling ◽  
Roll Roughness ◽  
Lubrication Conditions

Ferrite rolling of interstitial free steel strip in the temperature range 650-850°C can effectively reduce furnace costs and scale formation as a result of lower strip reheating temperatures. Different lubrication conditions of lubricating oil, solid lubricant and dry condition were used during ferrite rolling tests of thin interstitial free steel strip on a 2-high Hille 100 experimental rolling mill. Different rolling speed, rolling temperature and reductions were applied to the rolling process. The rolling force and roll roughness were affected by the lubrication conditions and rolling parameters. Solid lubricant indicated an improved performance in terms of the roll roughness, as well as the oxidation property of the strip surface during ferrite rolling.

Microtexture Study of Warm-Rolled High Strength Interstitial-Free (IF) Steel Sheets

2011 ◽  
Vol 682 ◽  
pp. 71-74
Author(s):  
Cai Nian Jing ◽  
Ming Gang Wang ◽  
Xi Jun Liu ◽  
Qi Zhong Tan ◽  
Zuo Cheng Wang ◽  
...  
Keyword(s):  
Grain Boundary ◽  
Electron Backscatter Diffraction ◽  
Texture Evolution ◽  
High Strength ◽  
Interstitial Free ◽  
If Steel ◽  
Boundary Character ◽  
Deep Drawability ◽  
Grain Boundary Character ◽  
High Strength If Steel

Interstitial-free (IF) steel has excellent deep-drawability and was used widely in automotive industry. High strength IF-steel is that some phosphorus was put in common IF-steel to improve its strength without destroying the deep-drawability [1]. Microstructure and grain boundary character strongly affect the deep-drawability of high strength IF-steel, it is an obligatory task to test those characters. The technique of Electron Backscatter Diffraction (EBSD) can reveal the microtexture and detailed orientation distribution of grains from a single EBSD map, as a powerful instrument, EBSD was used widely in materials research from last decade [2]. Many researches have been focused on the texture evolution and recrystallization phenomena of high strength IF-steels [3,4], but the microtexture and grain boundary characters of warm-rolled high strength IF-steels was not fully investigated. The present study was aimed at researching the microtexture characters of a commercial high strength IF-steels under different warm-rolled temperature using EBSD technique, the microstructure and grain boundary character were analyzed systemically, and the relationship between the microstructure and deep-drawability was discussed.

Microstructure and Texture Evolution of Strip Casting Fe-6.2wt%Si Steel

2011 ◽  
Vol 415-417 ◽  
pp. 947-950
Author(s):  
Hai Tao Liu ◽  
Zhen Yu Liu ◽  
Yu Sun ◽  
Yi Qing Qiu ◽  
Guo Dong Wang
Keyword(s):  
Electron Backscatter Diffraction ◽  
Texture Evolution ◽  
Core Loss ◽  
Casting Process ◽  
Warm Rolling ◽  
Fiber Texture ◽  
Strip Casting ◽  
Cast Strip ◽  
Process Stage ◽  
Backscatter Diffraction

An Fe-6.2wt%Si as-cast strip with equiaxed grains and obvious {001} fiber texture was produced by twin-roll strip casting process. The as-cast strip was successively performed by hot rolling, warm rolling and annealing. The microstructure and texture evolution at each process stage were investigated by using electron backscatter diffraction and x-ray diffraction. It was found that the finally annealed sheet was characterized by large grain size, mild γ-fiber texture and obvious {001} fiber texture. Therefore, a high magnetic induction and a low core loss were obtained in the sheet.

Effect of Strain Path on Texture Evolution in Cold Rolled Pure Titanium

2018 ◽  
Vol 921 ◽  
pp. 189-194
Author(s):  
Huan Ping Yang ◽  
Yao Mian Wang
Keyword(s):  
Cold Rolling ◽  
Strain Path ◽  
Texture Evolution ◽  
Pure Titanium ◽  
Rolling Texture ◽  
Deformation Texture ◽  
Fiber Texture ◽  
Prismatic Slip ◽  
Cross Rolling ◽  
Strain Paths

The cold rolling texture evolution as a function of strain path in pure titanium with initial typical recrystallized texture has been studied using viscoplastic self-consistent simulations. Three different strain paths, namely unidirectional rolling, two-step cross rolling and multi-step cross rolling have been employed to investigate the effect of strain path change on the evolution of deformation texture. The simulation results indicate that the activation of predominant prismatic slip in unidirectional rolling sample results in the formation of commonly cold rolling fiber texture RD//<10-10> in pure titanium, whereas the increased activity of basal slip over that of prismatic slip is responsible for the strong ND//<hkil> fiber texture in the two cross rolled samples.

scholarly journals Microstructure and Texture Evolution of Aluminum in the Al-Nb/Ti/Ni Composite Fabricated by the ARB Process

2020 ◽  
Vol 2020 ◽  
pp. 1-10
Author(s):  
Nan Ye ◽  
Xueping Ren
Keyword(s):  
Electron Microscopy ◽  
Grain Size ◽  
Texture Evolution ◽  
Shear Bands ◽  
Rolling Texture ◽  
Shear Texture ◽  
Electron Backscattered Diffraction ◽  
Transmission Electron ◽  
Average Grain Size ◽  
Ebsd Technique

The Al-Nb/Ti/Ni composite was fabricated from pure Al, Ni, Ti, and Nb sheets by the ARB technology. The microstructure evolution was observed by scanning electron microscopy, x-ray diffraction, and transmission electron microscopy. The evolution was evaluated by the electron backscattered diffraction (EBSD) technique. A couple of results we obtained showed that the microstructure of Al changed from equiaxed grains to a lamellar structure, and the grain size in the ND decreased gradually. Finally, the average grain size in the ND was 0.31 μm. Additionally, the fraction of HAGBs increased after the third pass, resulting from the dynamic recovery and the shear bands. The texture evolution was tested by electron backscattered diffraction. After the fourth pass, the Al exhibited a combination texture of rolling texture and shear texture. The rolling texture components were composed of Copper{112}<111>, Dillamore{4 4 11}<11 11 8>, S{123}<634>, and Brass{011}<211>, and the shear texture components were Rotated Cube {001}<110> and {111}//ND. The microhardness of Ni, Ti, Nb, and Al was improved in the ARB process and finally reached 226.4, 246.3, 187.2, and 44.2 HV, respectively.

scholarly journals Effect of Shear Deformation on Texture Evolution in Rolled Pure Titanium

2018 ◽  
Vol 186 ◽  
pp. 02002
Author(s):  
Huanping Yang ◽  
Yaomian Wang
Keyword(s):  
Cold Rolling ◽  
Shear Deformation ◽  
Texture Evolution ◽  
Pure Titanium ◽  
Rolling Texture ◽  
Fiber Texture ◽  
Relative Contribution ◽  
Pyramidal Slip ◽  
Roll Gap ◽  
Cold Rolling Texture

The cold rolling texture evolution under different strain states caused by coupled effects from different combinations of roll gap geometry and friction in pure titanium with initial typical recrystallized texture has been studied using viscoplastic self-consistent simulations. Under plane strain state, the texture is dominated by a typical cold rolling fiber texture RD//<1010> in pure titanium. However, when shear deformation is induced and increased, RD//<1010> fiber texture is decreased, whereas basal texture (0001)[1010] is increased and a strong partial fiber texture RD//<2110> is formed. The variation of cold rolling texture at different strain states can be ascribed to variation of relative contribution from activation of prismatic, basal and pyramidal slip.

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