Effect of High Density Electropulsing Current on Microstructure and Mechanical Properties of Fe-6.5wt.%Si Alloy Sheet

2017 ◽  
Vol 898 ◽  
pp. 1236-1241 ◽  
Author(s):  
Y.Y. Liu ◽  
Y.F. Liang ◽  
S.B. Wen ◽  
Feng Ye ◽  
J.P. Lin
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Rolling Process ◽  
High Energy ◽  
Alloy Sheet ◽  
High Density ◽  
Rolled Sheet ◽  
Microstructure And Mechanical Properties ◽  
Conventional Heat Treatment ◽  
Hot Rolled

Fe-6.5wt.%Si alloy is an excellent soft magnetic material. Due to the appearance of ordering structures, the alloy shows poor ambient temperature ductility, and can only be cold rolled by specific rolling process. The rolling process with heat treatment is complex and time consuming. Meanwhile, high-energy electropulsing shows electroplastic effect. Heat treatment effect of the high-density electropulsing on microstructure and mechanical properties were investigated. The hot rolled sheet with 1 mm in thickness could be uniformly recrystallized in 33 s at 690 oC by appropriate high density pulses and the ductility was improved in comparison to the conventional heat treatment in a furnace. After the electropulsing treatment, the hot rolled sheet could be warm rolled by 50% reduction of the thickness after one pass without edge crack.

Effect of High Density Pulsing Current on Mechanical Properties of Fe-6.5wt.%Si Alloy Sheet

2013 ◽  
Vol 749 ◽  
pp. 151-156 ◽  
Author(s):  
H.C. Zhou ◽  
Yong Feng Liang ◽  
Feng Ye ◽  
Guo Yi Tang ◽  
Jun Pin Lin
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Treatment Approach ◽  
Treatment Method ◽  
Rolling Process ◽  
Alloy Sheet ◽  
High Density ◽  
Rolled Sheet ◽  
Conventional Heat Treatment ◽  
Si Content

t is well known that excellent soft magnetic properties are obtained in electrical steel with Si content of 6.5wt.%, such as high permeability, low coercive force, near zero magnetostriction, etc. However due to its poor ambient temperature ductility it is very hard to fabricate this material by conventional hot-cold rolling process. Meanwhile, high-density electropulsing treatment (EPT) attracts widespread applications as a new heat treatment approach. In this paper, heat treatment effect of high-density pulsing current on microstructure, micro-hardness and mechanical properties of as rolled Fe-6.5wt.%Si alloy sheet were investigated. The results showed that the microstructure and mechanical properties were closely related to the parameters of the pulses. Refined and uniform recrystallized grains were obtained by optimizing parameters of the high density pulses. Compared with the conventional heat treatment method, the time and temperature for heat treatment can be reduced dramatically. Therefore, it is considered that EPT is an efficient heat treatment approach for this rolled sheet. Mechanism of the effect of high-density pulsing current has been discussed also in this investigation.

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.

Effect of Heat Treatment on Microstructure and Mechanical Properties in ZK60 Alloy Sheet

2007 ◽  
Vol 567-568 ◽  
pp. 361-364 ◽  
Author(s):  
Suk Bong Kang ◽  
Jae Hyung Cho ◽  
Hyoung Wook Kim ◽  
Y.M Jin
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Solution Treatment ◽  
Aging Treatment ◽  
Growth Direction ◽  
Warm Rolling ◽  
Alloy Sheet ◽  
Microstructure And Mechanical Properties ◽  
Zk60 Alloy ◽  
Hardness Values

The sheet of ZK60 alloy with a thickness of 1mm was prepared from a casting ingot followed by homogenization and warm-rolling. Variations in microstructure and mechanical properties of ZK60 alloy sheets were investigated during T6 treatment. Especially artificial aging after solution heat treatment affected both precipitates distribution and mechanical properties with aging treatment. Variations of mechanical properties were related to precipitates, i.e. rod-shaped ( 1 β ′ ) or disc shaped ( 2 β ′ ) particles. Around the peak of hardness values, regularly distributed rod-shaped ( 1 β ′ ) precipitates were found. The rod-shaped ( 1 β ′ ) precipitates were oriented with a growth direction of [0001]. When over-aged, rod-shaped ( 1 β ′ ) precipitates were expected to decrease and the density of disc-shaped ( 2 β ′ ) precipitates to change. The rod-shaped ( 1 β ′ ) precipitates mainly consist of {Mg, Zn}, while disc-shaped ( 2 β ′ ) precipitates, {Mg, Zn, Zr} or {Mg, Zn}. In this study the optimum T6 treatment was determined as solution treatment at 430 °C for 6 hours and subsequently aging treatment at 175 °C for 18 hours. At this T6 condition the tensile strength, yield strength and elongation are 321MPa, 280MPa and 16%, respectively.

Effect of Heat Treatment on Microstructure and Mechanical Properties of MA2-1 Alloy Sheet

2005 ◽  
Vol 488-489 ◽  
pp. 151-154
Author(s):  
Weichao Zheng ◽  
Xiao Li Sun ◽  
Peijie Li ◽  
Daben Zeng ◽  
L.B. Ber
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Solid Solution ◽  
High Purity ◽  
Solution Treatment ◽  
Optical Microscope ◽  
Alloy Sheet ◽  
Β Phase ◽  
Microstructure And Mechanical Properties ◽  
Mg17al12 Phase

Effect of heat treatment on the microstructure and mechanical properties of high purity MA2-1(Mg-5wt.%Al-1wt.%Zn-0.4wt.%Mn) alloy sheet were investigated. X-ray diffraction analysis indicated that the microstructure of high purity MA2-1 alloy sheet annealed consisted of α-Mg solid solution, β (Mg17Al12) phase and Al-Mn phases such as Al6Mn and Al10Mn3. β phase dissolved into α-Mg solid solution during the solution treatment and formed supersaturated α-Mg solid solution. After aging at the temperatures of 423 K, 473 K and 523 K for 12 hours, β phase precipitated from the supersaturated α-Mg solid solution. Optical microscope observation found that the grain size of the MA2-1 alloy sheet became larger after heat treatment. As a result, the mechanical properties of the MA2-1 alloy sheet such as the tensile strength and yield strength declined after the heat treatment.

scholarly journals Effect of Reduction in Thickness and Rolling Conditions on Mechanical Properties and Microstructure of Rolled Mg-8Al-1Zn-1Ca Alloy

2017 ◽  
Vol 2017 ◽  
pp. 1-9 ◽  
Author(s):  
Yuta Fukuda ◽  
Masafumi Noda ◽  
Tomomi Ito ◽  
Kazutaka Suzuki ◽  
Naobumi Saito ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Grain Size ◽  
High Strength ◽  
Rolling Process ◽  
Rolled Sheet ◽  
Roll Temperature ◽  
Mean Grain Size ◽  
Thick Rolled Sheet ◽  
Hot Rolled ◽  
Strength And Ductility

A cast Mg-8Al-1Zn-1Ca magnesium alloy was multipass hot rolled at different sample and roll temperatures. The effect of the rolling conditions and reduction in thickness on the microstructure and mechanical properties was investigated. The optimal combination of the ultimate tensile strength, 351 MPa, yield strength, 304 MPa, and ductility, 12.2%, was obtained with the 3 mm thick Mg-8Al-1Zn-1Ca rolled sheet, which was produced with a roll temperature of 80°C and sample temperature of 430°C. This rolling process resulted in the formation of a bimodal structure in the α-Mg matrix, which consequently led to good ductility and high strength, exclusively by the hot rolling process. The 3 mm thick rolled sheet exhibited fine (mean grain size of 2.7 μm) and coarse grain regions (mean grain size of 13.6 μm) with area fractions of 29% and 71%, respectively. In summary, the balance between the strength and ductility was enhanced by the grain refinement of the α-Mg matrix and by controlling the frequency and orientation of the grains.

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.

Sign in / Sign up

Export Citation Format

Share Document