The Work Softening by Deformation-Induced Disordering and Cold Rolling of 6.5 wt pct Si Steel Thin Sheets

2016 ◽  
Vol 47 (9) ◽  
pp. 4659-4668 ◽  
Author(s):  
Xianglong Wang ◽  
Haoze Li ◽  
Weina Zhang ◽  
Zhenyu Liu ◽  
Guodong Wang ◽  
...  
Keyword(s):  
Cold Rolling ◽  
Thin Sheets ◽  
Work Softening

A Study on the Deformation Dehaviours of Al-1.4Fe-0.2Mn Alloy Sheets

2016 ◽  
Vol 877 ◽  
pp. 380-386 ◽  
Author(s):  
Yan Feng Pan ◽  
Pi Zhi Zhao ◽  
Yi Fu Shen ◽  
Xiang Jun Shi ◽  
Tao Jiang
Keyword(s):  
Dislocation Density ◽  
Cold Rolling ◽  
Work Hardening ◽  
Energy Dispersive Spectrometer ◽  
Rolling Process ◽  
Rolling Reduction ◽  
Pure Aluminium ◽  
Work Softening ◽  
Grain Structures ◽  
Cold Rolling Reduction

The deformation behaviours and microstructure transformations during the cold rolling process of Al-1.4Fe-0.2Mn alloy sheets prepared from 99.7% pure aluminium were investigated by means of hardness-testing, transmission electron microscopy (TEM) and energy dispersive spectrometer (EDS). The phenomena of work hardening and work softening were observed. The hardness of Al-1.4Fe-0.2Mn alloy sheets increased with the increasing of cold rolling reduction firstly, and reached to a peak at 80% cold rolling reduction, meaning work hardening. However, with further increasing of cold rolling reduction, the hardness decreased, which indicates work softening. During the initial deformation stage, the dislocation density and the number of sub-grain structures increased gradually, and many dislocations formed tangles, resulting in work hardening. When the cold rolling reduction exceeded 80%, the dislocation density decreased and sub-grain structures polygonized, leading to work softening. The forming of Mn, Fe and Si bearing compounds is an important reason for the work softening due to lowering solid solution content.

Characteristics of Powder-Rolled and Sintered Sheets Made from HDH Ti Powders

2012 ◽  
Vol 520 ◽  
pp. 281-288 ◽  
Author(s):  
Nho Kwang Park ◽  
C.H. Lee ◽  
Jeoung Han Kim ◽  
Jae Keun Hong
Keyword(s):  
Cold Rolling ◽  
Relative Density ◽  
Tensile Properties ◽  
Process Parameters ◽  
Annealing Treatment ◽  
Powder Rolling ◽  
Powder Size ◽  
Thin Sheets ◽  
Roll Speed ◽  
Roll Gap

In this study, direct powder rolling was applied to make thin sheets from HDH (hydrogenation and dehydrogenation) powders. Effects of materials and process parameters on tensile properties of sintered sheets are investigated. In the direct powder rolling with two-horizontal counter-rotating rollers, materials parameters including powder size and process parameters such as roll gap, roll speed, and packing height are controlled. With -100mesh Ti powders, CP titanium sheets of a thickness up to 1.5mm and a width up to 300mm were obtained without any rolling defects. Sintering of the rolled strips was performed between 1000°C and 1250°C at 50°C intervals for 1hour to 4 hours. The relative density of the sintered strips was found to be around 85 to 90 percent. After sintering, the complete densification was made by cold rolling, and microstructures and tensile properties were evaluated after annealing treatment at 750°C for 2 hours.

scholarly journals Study of energy consumption for cold rolling of thin sheets

2021 ◽  
pp. 56-61
Author(s):  
V.A. Chubenko ◽  
Т.P. Yarosh ◽  
А.A. Khinotska ◽  
◽  
◽  
...  
Keyword(s):  
Energy Consumption ◽  
Cold Rolling ◽  
Thin Sheets

scholarly journals Analysis of the Effect of Ultrasonic Welding on Microstructure

2018 ◽  
Vol 1 (1) ◽  
pp. 49-52
Author(s):  
Tünde Kovács ◽  
Péter Pinke
Keyword(s):  
Mechanical Properties ◽  
Cold Rolling ◽  
Welding Process ◽  
Ultrasonic Welding ◽  
Grain Structure ◽  
Welding Parameters ◽  
Recrystallization Process ◽  
Thin Sheets ◽  
Metal Sheets ◽  
Joining Process

Abstract Ultrasonic welding is very useful for joining thin metal sheets [1, 2]. The effect of ultrasound on microstructure is currently not well understood because the changes produced depend very much on the welding parameters and the properties of the metal being considered. Thin sheets formed by cold rolling acquire a special grain structure. During the welding process the heat produced causes recrystallization; even where heat is not applied in the joining process the recrystallization process alters the mechanical properties within the heat affected zone (HAZ). The mechanical properties of the welded samples depend on the microstructure. In this work we analyse the ultrasonic welding effect on the joint and the HAZ [3, 4].

Effects of Normalizing Annealing on the Recrystallization Texture of 4.2wt.%Si Non-Oriented Electrical Steel Thin Sheets

2012 ◽  
Vol 535-537 ◽  
pp. 615-619 ◽  
Author(s):  
Jinlong Liu ◽  
Yu Hui Sha ◽  
Yong Chuang Yao ◽  
Fang Zhang ◽  
Liang Zuo
Keyword(s):  
Cold Rolling ◽  
Recrystallization Texture ◽  
Electrical Steel ◽  
Shear Bands ◽  
Rolling Process ◽  
Thin Sheets ◽  
Conventional Procedure ◽  
Cold Rolling And Annealing ◽  
Cold Rolled ◽  
Normalizing Annealing

The 4.2wt.%Si non-oriented electrical steel thin sheets with the thickness of 0.30mm were produced by the conventional procedure including hot rolling, cold rolling and annealing. The recrystallization texture was analyzed with emphasis on the effect of normalizing annealing. The results show that the  fiber with peak at {111} is weaker and η fiber is stronger in the sheets with normalizing annealing than those without normalizing annealing, either under the cold rolled reduction of 77% or 86%. Effects of normalizing annealing on the recrystallization texture can be explained in terms of the characteristic of the shear bands formed during cold rolling process.

Rectifying Process Problems in Production of Thin Sheets of Special Alloys

2013 ◽  
Vol 739 ◽  
pp. 148-154
Author(s):  
Petr Martínek ◽  
Pavel Podaný ◽  
Ivana Poláková ◽  
Jaroslav Tuček
Keyword(s):  
Cold Rolling ◽  
Fem Simulation ◽  
Melting Furnace ◽  
Material Model ◽  
Rolling Process ◽  
Fine Tuning ◽  
Thin Sheets ◽  
Specific Material ◽  
Hot And Cold Rolling ◽  
3D Software

The paper deals with solutions to particular process problems in production of thin sheets of special nickel and iron-based alloys. Experiments were focused on trial operation of a new melting furnace, on hot rolling of feedstock from experimental heats and on fine-tuning hot and cold rolling processes with the aid of numerical modelling in DEFORM 3D software. The paper also gives description of results of FEM simulation of cold rolling of strips. A FEM model of the cold rolling process with front and back tension was developed. In order to describe the behaviour of nickel alloys in the FEM simulation, a specific material model was proposed. This material model combines the material data obtained from Rastegaev compression test and the results of thermodynamical calculation from JMatPro software.

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