Superplastic Behavior of Al-4.5Mg-0.46Mn-0.44Sc Alloy Sheet Produced by a Conventional Rolling Process

2009 ◽  
Vol 19 (2) ◽  
pp. 221-230 ◽  
Author(s):  
A. Smolej ◽  
B. Skaza ◽  
V. Dragojević
Keyword(s):  
Rolling Process ◽  
Alloy Sheet ◽  
Superplastic Behavior ◽  
Conventional Rolling

scholarly journals Reduce the Planar Anisotropy of AA6016 Aluminum Sheets by Texture and Microstructure Control

Crystals ◽  
2020 ◽  
Vol 10 (11) ◽  
pp. 1027
Author(s):  
Xiaoge Duan ◽  
Haitao Jiang ◽  
Zhenli Mi ◽  
Lei Cheng ◽  
Jiayi Wang
Keyword(s):  
Solution Treatment ◽  
Rolling Process ◽  
Alloy Sheet ◽  
Electron Back Scatter Diffraction ◽  
Grain Structure ◽  
X Ray Diffraction ◽  
Planar Anisotropy ◽  
Aluminum Sheets ◽  
Hot Rolled ◽  
Conventional Rolling

In order to produce a more isotropic Al-Mg-Si alloy sheet in the T4 temper, pre-annealed AA6016 hot rolled strips were cold rolled by conventional rolling, transverse rolling and an alternative rolling schedule. In this work, a weak and random texture was obtained in the alternative rolling sample, which was treated by solution treatment, as well as a fine and homogeneous recrystallized grain structure that reduced the earing percentage from 8.2% to 2.7%. An earing test was used to characterize the planar anisotropy of the AA6016 alloy. The crystallographic texture and microstructure of the AA6016 aluminum sheet were analyzed by X-ray diffraction and electron back scatter diffraction (EBSD) techniques. The earing percentage was reduced and eight-fold ears were produced in unidirectional rolled samples with strong β-fiber textures. Conversely, a higher earing percentage and four-fold ears were obtained for the alternative rolled sample, which was characterized by an appropriate combination of the Cube {001}<100> and stabilized BND {011}<3`22> [(φ1,¢,φ2) = (42°,45°,0°)] orientations. The main reason for the distinct earing profiles was the grain spatial distribution of textures formed during the cold rolling process. The dynamic recovery of the AA6016 alloy was promoted and both the nucleation and subsequent growth of the Cube orientation were suppressed by alternative rolling.

The Effect of Differential Speed Rolling on Microstructure and Mechanical Properties of an AZ31 Alloy Sheet

2006 ◽  
Vol 116-117 ◽  
pp. 235-238 ◽  
Author(s):  
Ha Guk Jeong ◽  
Y.G. Jeong ◽  
Duk Jae Yoon ◽  
Seo Gou Choi ◽  
Woo Jin Kim
Keyword(s):  
Mechanical Properties ◽  
Az31 Alloy ◽  
Rolling Process ◽  
Alloy Sheet ◽  
Microstructure And Mechanical Properties ◽  
High Anisotropy ◽  
Az31 Sheet ◽  
Differential Speed Rolling ◽  
Conventional Rolling ◽  
Differential Speed

Magnesium alloy AZ31, which processed by conventional rolling or extrusion, has high anisotropy of mechanical properties in its strength and elongation at room temperature. We compared the influence of differential speed rolling with conventional rolling process on microstructure and mechanical properties of commercial AZ31 sheet. Commercial AZ31 alloy sheets were processed with conventional and differential speed rolled with thickness reduction ratio of 30% at a various temperature. The elongation of AZ31 alloy, warm-rolled by differential speed rolling is larger than rolled by conventional rolling. Besides, grain size and distribution on microstructure of the conventional rolling were coarsely(~30μm) and inhomogeneously but, that those of the differential speed rolling were fine(~13μm) and homogeneously.

Study on the Microstructure and Texture of Warm Rolled ZK60 Magnesium Alloy Sheet

2012 ◽  
Vol 557-559 ◽  
pp. 1344-1348
Author(s):  
Hong Mei Chen ◽  
Hua Shun Yu ◽  
Guang Hui Min ◽  
Yun Xue Jin
Keyword(s):  
Shear Bands ◽  
Rolling Direction ◽  
Rolling Process ◽  
Warm Rolling ◽  
Alloy Sheet ◽  
Rolling Temperature ◽  
Rolling Reduction ◽  
Basal Pole ◽  
Zk60 Alloy ◽  
Twin Roll

The microstructure and macrotexture of ZK60 alloy sheet were investigated through OM and XRD, which were produced by twin roll casting and sequential warm rolling. Microstructure of twin roll cast ZK60 alloy changed from dendrite structure to fibrous structure with elongated grains and high density shear bands along the rolling direction after warm rolling process at different rolling parameters. The density of shear bands increased with the decreasing of the rolling temperature, or the increasing of per pass rolling reduction. Dynamic recrystallization could be found during the warm rolling process at and above 350oC, and many fine grains could be found in the shear band area. The warm rolled ZK60 alloy sheet exhibited strong (0001) basal pole texture. The formation of the shear bands tends to cause the basal pole tilt slightly to the transverse direction after warm rolling. The intensity of (0001) pole figure increased with the decreasing of rolling temperature, or the increasing of per pass rolling reduction.

scholarly journals Recrystallization Microstructure Prediction of a Hot-Rolled AZ31 Magnesium Alloy Sheet by Using the Cellular Automata Method

2019 ◽  
Vol 2019 ◽  
pp. 1-15
Author(s):  
Ming Chen ◽  
Xiaodong Hu ◽  
Hongyang Zhao ◽  
Dongying Ju
Keyword(s):  
Flow Stress ◽  
Magnesium Alloy ◽  
Cellular Automata ◽  
Process Analysis ◽  
Rolling Process ◽  
Alloy Sheet ◽  
Az31 Magnesium Alloy ◽  
Rolled Sheet ◽  
Element Analysis ◽  
Hot Rolled

A large reduction rolling process was used to obtain complete dynamic recrystallization (DRX) microstructures with fine recrystallization grains. Based on the hyperbolic sinusoidal equation that included an Arrhenius term, a constitutive model of flow stress was established for the unidirectional solidification sheet of AZ31 magnesium alloy. Furthermore, discretized by the cellular automata (CA) method, a real-time nucleation equation coupled flow stress was developed for the numerical simulation of the microstructural evolution during DRX. The stress and strain results of finite element analysis were inducted to CA simulation to bridge the macroscopic rolling process analysis with the microscopic DRX activities. Considering that the nucleation of recrystallization may occur at the grain and R-grain boundary, the DRX processes under different deformation conditions were simulated. The evolution of microstructure, percentages of DRX, and sizes of recrystallization grains were discussed in detail. Results of DRX simulation were compared with those from electron backscatter diffraction analysis, and the simulated microstructure was in good agreement with the actual pattern obtained using experiment analysis. The simulation technique provides a flexible way for predicting the morphological variations of DRX microstructure accompanied with plastic deformation on a hot-rolled sheet.

Research on the Rolling of AZ31 Strip Prepared by Twin Roll Casting

2009 ◽  
Vol 610-613 ◽  
pp. 844-847 ◽  
Author(s):  
Jian Wang ◽  
Bin Jiang ◽  
Pei Dao Ding ◽  
Guang Jie Huang ◽  
Fu Sheng Pan
Keyword(s):  
Thin Sheet ◽  
Rolling Process ◽  
Minimum Thickness ◽  
Small Thickness ◽  
Cast Strip ◽  
Twin Roll Casting ◽  
Roll Casting ◽  
Az31 Sheet ◽  
Conventional Rolling ◽  
Twin Roll

The AZ31 thin sheet (minimum thickness less than 1mm) was obtained by rolling the cast strip which was prepared by vertical twin roll casting in this paper. Since the absolute deformation during rolling was smaller,due to the small thickness of the strip of 3mm, the rolling of cast strip was different from the conventional rolling process. It was found that homogenizing time at 400°C for the cast strip was 4h and reduction per pass should be 8-10% for producing thinner (1-1.5mm) rolled AZ31 sheet at 350°C. Mechanical properties of the sheet were equivalent to conventional rolling sheet’s.

Effect of the Rolling Process on Microstructures and Mechanical Properties of the Extruded LA91 Alloy Sheet

2011 ◽  
Vol 686 ◽  
pp. 90-95 ◽  
Author(s):  
Bin Jiang ◽  
Qing Shan Yang ◽  
Liang Gao ◽  
Fu Sheng Pan
Keyword(s):  
Mechanical Properties ◽  
Microstructure Evolution ◽  
Hot Rolling ◽  
Rolling Process ◽  
Alloy Sheet ◽  
Rolling Reduction ◽  
Thermal Compression ◽  
Cross Rolling ◽  
The Cross ◽  
Rolling Route

The microstructure evolution of the extruded Mg-9Li-1Al (LA91) during rolling was investigated taking account of effects of different routes including hot rolling, and cross rolling. The rolling parameters were suggested by thermal compression testing. As a result, the suggested rolling parameters were 250°C and 1.0s-1. Transverse hot rolling would bring a finer microstructure to the as-rolled LA91 sheet. With the enhancement of the rolling reduction during unidirectional hot rolling the α-Mg phase became granular or short rod-like from long strip-like. Transverse + longitudinal hot rolling would improve the microstructure and was a better cross rolling route by which the strength and the elongation of the cross rolled LA91 sheet reached 243MPa and 20% respectively. The over-aging existed in the cross rolled LA91 sheets.

scholarly journals Studies of the AA2519 Alloy Hot Rolling Process and Cladding with EN AW-1050A Alloy

2016 ◽  
Vol 61 (1) ◽  
pp. 381-388 ◽  
Author(s):  
B. Płonka ◽  
M. Rajda ◽  
Z. Zamkotowicz ◽  
J. Żelechowski ◽  
K. Remsak ◽  
...  
Keyword(s):  
Hot Rolling ◽  
Coating Layer ◽  
Rolling Process ◽  
Alloy Sheet ◽  
Final Thickness ◽  
Cladding Layer ◽  
The Core ◽  
Hot Rolling Process ◽  
Plastic Forming ◽  
Cladding Material

The objective of the study was to determine the feasibility of plastic forming by hot rolling of the AA2519 aluminium alloy sheets and cladding these sheets with a layer of the EN AW-1050A alloy. Numerous hot-rolling tests were carried out on the slab ingots to define the parameters of the AA2519 alloy rolling process. It has been established that rolling of the AA2519 alloy should be carried out in the temperature range of 400-440°C. Depending on the required final thickness of the sheet metal, appropriate thickness of the EN AW-1050A alloy sheet, used as a cladding layer, was selected. As a next step, structure and mechanical properties of the resulting AA2519 alloy sheets clad with EN AW-1050A alloy was examined. The thickness of the coating layer was established at 0,3÷0,5mm. Studies covered alloy grain size and the core alloy-cladding material bond strength.

Precipitates and Lüders Elongation in Ferritic Stainless Steels Stabilized with Ti and V

2011 ◽  
Vol 194-196 ◽  
pp. 16-19 ◽  
Author(s):  
Fei Gao ◽  
Wei Na Zhang ◽  
Zhi Bo Zhang ◽  
Zhen Yu Liu ◽  
Guo Dong Wang
Keyword(s):  
Solid Solution ◽  
Internal Friction ◽  
Stainless Steels ◽  
Low Temperatures ◽  
Rolling Process ◽  
Ferritic Stainless Steels ◽  
Finish Rolling ◽  
Friction Measurements ◽  
Hot Rolled ◽  
Conventional Rolling

The influence of finish rolling temperature on the precipitates and Lüders elongation in ultra purified ferritic stainless steels stabilized with Ti and V has been investigated, in which the hot rolled bands were produced by conventional rolling process and the finish rolling at relatively low temperatures. It was shown that finish rolling at relatively low temperatures promoted the formation of a large number of fine MC precipitates, which were denser in dispersion and finer in size than those formed in conventional rolling process by strain-induced precipitation, and consequently scavenging of interstitial atoms in solid solution, indicating that the finish rolling at relatively low temperatures can be the effective way to significantly reduced Lüders elongation for the final sheets. These results have been confirmed by the internal friction measurements.

scholarly journals Variations of the Elastic Properties of the CoCrFeMnNi High Entropy Alloy Deformed by Groove Cold Rolling

Materials ◽  
2018 ◽  
Vol 11 (8) ◽  
pp. 1337 ◽  
Author(s):  
Paul Lohmuller ◽  
Laurent Peltier ◽  
Alain Hazotte ◽  
Julien Zollinger ◽  
Pascal Laheurte ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Cold Rolling ◽  
Young’S Modulus ◽  
Crystallographic Texture ◽  
Young's Modulus ◽  
Rolling Process ◽  
High Entropy Alloy ◽  
Strengthening Effect ◽  
High Entropy ◽  
Conventional Rolling

The variations of the mechanical properties of the CoCrFeMnNi high entropy alloy (HEA) during groove cold rolling process were investigated with the aim of understanding their correlation relationships with the crystallographic texture. Our study revealed divergences in the variations of the microhardness and yield strength measured from samples deformed by groove cold rolling and conventional cold rolling processes. The crystallographic texture analyzed by electron back scattered diffraction (EBSD) revealed a hybrid texture between those obtained by conventional rolling and drawing processes. Though the groove cold rolling process induced a marked strengthening effect in the CoCrFeMnNi HEA, the mechanical properties were also characterized by an unusual decrease of the Young’s modulus as the applied groove cold rolled deformation increased up to about 0.5 before reaching a stabilized value. This decrease of the Young’s modulus was attributed to the increased density of mobile dislocations induced by work hardening during groove cold rolling processing.

PREDICTION OF FORMABILITY FOR MAGNESIUM ALLOY SHEET USING FINITE ELEMENT POLYCRYSTAL MODEL

2006 ◽  
Vol 20 (25n27) ◽  
pp. 4335-4340
Author(s):  
SUNG YEUN WON ◽  
BONG SUN YOU ◽  
YOUNG SUK KIM ◽  
SEUNG HAN YANG
Keyword(s):  
Finite Element ◽  
Yield Surface ◽  
Deep Drawing ◽  
Bauschinger Effect ◽  
Rolling Process ◽  
Alloy Sheet ◽  
Biaxial Strain ◽  
Simulation Results ◽  
Cup Drawing ◽  
Strain Direction

In this study, in order to analyze deformation mechanism in rolling process and predict its yield surface finite element polycrystal model (FEPM) has been developed. Also numerical simulations for deep drawing process of AZ31 magnesium sheet were conducted at elevated temperature. Numerical simulation results for rolling process were compared with experiments of pole figure. For yield surface, the results indicated shift of yield surface along the biaxial strain direction denoting Bauschinger effect and strong anisotropic which is advantageous to deep drawing. Simulation results for limiting drawing ration (LDR) in cup drawing simulation agreed well with experimental observations.

Sign in / Sign up

Export Citation Format

Share Document