Characterization of Magnesium Plates Produced by Wheel-Band Casting and Horizontal Continuous Casting

2005 ◽  
Vol 488-489 ◽  
pp. 337-340
Author(s):  
Dong Yim Chang ◽  
Bong Sun You ◽  
Bum Sik Kam ◽  
Won Wook Park
Keyword(s):  
Continuous Casting ◽  
Az31 Alloy ◽  
Rolling Process ◽  
Processing Parameters ◽  
Homogenization Treatment ◽  
Horizontal Continuous Casting ◽  
Surface Machining ◽  
Good Surface ◽  
Hot Rolling Process

AZ31 magnesium plates with 1mm in thickness were fabricated by casting and subsequent hot rolling process. Both wheel-band continuous casting (modified Properzi) and horizontal continuous casting (HCC) machine were designed and employed to produce AZ31 alloy plates. The plates with 5x50mm in size produced by modified Properzi process exhibited good surface qualities that were sustained during following rolling process. Surface qualities of HCC plates with 120x30mm in size were very sensitive depending on the processing parameters. Homogenization treatment or surface machining before rolling was effective to get good thin plate. By means of rolling process, microstructures were refined effectively to the size of 7~10µm.

scholarly journals 3D-FEM Simulation of Hot Rolling Process and Characterization of the Resultant Microstructure of a Light-Weight Mn Steel

Crystals ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 569
Author(s):  
Ana Claudia González-Castillo ◽  
José de Jesús Cruz-Rivera ◽  
Mitsuo Osvaldo Ramos-Azpeitia ◽  
Pedro Garnica-González ◽  
Carlos Gamaliel Garay-Reyes ◽  
...  
Keyword(s):  
Hot Rolling ◽  
Thermomechanical Processing ◽  
Computational Simulation ◽  
Effective Strain ◽  
Fem Simulation ◽  
Rolling Process ◽  
3D Fem ◽  
Hot Rolling Process ◽  
Mn Steel

Computational simulation has become more important in the design of thermomechanical processing since it allows the optimization of associated parameters such as temperature, stresses, strains and phase transformations. This work presents the results of the three-dimensional Finite Element Method (FEM) simulation of the hot rolling process of a medium Mn steel using DEFORM-3D software. Temperature and effective strain distribution in the surface and center of the sheet were analyzed for different rolling passes; also the change in damage factor was evaluated. According to the hot rolling simulation results, experimental hot rolling parameters were established in order to obtain the desired microstructure avoiding the presence of ferrite precipitation during the process. The microstructural characterization of the hot rolled steel was carried out using optical microscopy (OM), scanning electron microscopy (SEM) and X-ray diffraction (XRD). It was found that the phases present in the steel after hot rolling are austenite and α′-martensite. Additionally, to understand the mechanical behavior, tensile tests were performed and concluded that this new steel can be catalogued in the third automotive generation.

Rolling Process of AZ31 Alloy Bar Using Three Roller Mill

2014 ◽  
Vol 633-634 ◽  
pp. 707-711
Author(s):  
La Feng Guo ◽  
Le Tao Jiang ◽  
Bao Cheng Li ◽  
Zhi Heng Li
Keyword(s):  
Hot Rolling ◽  
Az31 Alloy ◽  
Rolling Process ◽  
Roller Mill ◽  
Pass System ◽  
Hot Rolling Process ◽  
Rolling Method ◽  
3D Software ◽  
Deform 3D ◽  
Round Pass

Structure and pass system of Y-type mill which have three-roller is analyzed. A hot rolling method to produce magnesium alloy bars through flat triangle-arc triangle-round pass system is put forward. Using Deform-3D software, the rolling process of AZ31 alloy bar is simulated to determine the parameters of the rolling process and die. The experiment verifies that the hot rolling process is feasible. The organizational structure is analyzed with metallographic microscope, and the results show that dynamic recrystallization is occurred, the grain size is obviously refined, and the mechanical property of the material is improved in hot rolling process.

Characterization of inclusions in axle steel by ingot casting

2019 ◽  
Vol 116 (5) ◽  
pp. 501
Author(s):  
Qinghai Zhou ◽  
Jiongming Zhang ◽  
Yanbin Yin ◽  
Mingzhi Zhai
Keyword(s):  
Molten Steel ◽  
Solidification Process ◽  
Rolling Process ◽  
Ingot Casting ◽  
Number Density ◽  
Mold Powder ◽  
Hot Rolling Process ◽  
Sulfide Precipitation ◽  
Analysis System

The composition, size distribution and number density of inclusions in the rolled billet of bottom-teemed axle steel have been investigated through the inclusion automatic analysis system (INCAFeature, Oxford Instruments). Additionally, the thermodynamics calculation of sulfide precipitation during the solidification and rolling processes has been carried out. Seven types of inclusions are found in rolled billets, which are almost originated from the refined molten steel. However, re-oxidation, sulfide precipitation and mold powder entrainment modify the composition of inclusions during the pouring, solidification and rolling processes. Precipitation of CaS is initiated during the solidification process of molten steel. The precipitation of MnS can only be found during the hot rolling process. Inclusions in the interior of the rolled billet are more and larger than those in the subsurface of rolled billet. The inclusion index increases from the rear to the head of the rolled billet (from the bottom to the top of the ingot). Furthermore, the inclusion index increases as the superheat increases. On the basis of the results, it is recommended that molten steel should be poured at a low superheat under the protection of argon shroud. Furthermore, attention may be paid to the way of adding the mold powder.

Research of Technological Factors on Producing Oxygen-Free Copper Strip in Horizontal Continuous Casting

2012 ◽  
Vol 538-541 ◽  
pp. 1097-1100
Author(s):  
Zu Li Sun ◽  
Ming En Guo ◽  
Yu Chen Guo
Keyword(s):  
Continuous Casting ◽  
Orthogonal Experiment ◽  
Casting Process ◽  
Rolling Process ◽  
Copper Strip ◽  
Horizontal Continuous Casting ◽  
Technological Factors ◽  
Coarse Grains ◽  
Technical Factors ◽  
The Relationship

In the method that the oxygen-free copper strips are produced through undercurrent horizontal continuous casting-cold rolling process, there are some coarse grains, microscopic cracks, shrinkage, shrinkage and segregation defects in the oxygen-free copper strip billet, which debase the densities of the strip billet, and are the main reasons for rejected castings during machining operation. Through the orthogonal experiment of the technical factors in the casting process, the mapping model of artificial neural networks have been established using the data obtained in the experiments, which built the relationship among the densities of casting blank and technological factors. With the help of this model, the optimal casting conditions have been researched by using GA optimizations method and real experiments. The results show that micro-structure of castings was improved and the densities of the strip billets are enhanced.

Experimental Study on Horizontal Continuous Casting of 6061 Aluminium Alloy Bar Process

2011 ◽  
Vol 480-481 ◽  
pp. 100-103 ◽  
Author(s):  
Xiang Jie Wang ◽  
Jiao Zhang ◽  
Yun Peng Huang ◽  
Zhi Hao Zhao ◽  
Jian Zhong Cui
Keyword(s):  
Continuous Casting ◽  
Aluminium Alloy ◽  
Production Efficiency ◽  
Cooling Water ◽  
Hot Extrusion ◽  
Lubricating Oil ◽  
Horizontal Continuous Casting ◽  
Good Surface ◽  
6061 Aluminium Alloy ◽  
The Cost

The aluminium alloy bar is mainly obtained by hot extrusion in the past. In order to increase the production efficiency and reduce the cost, a new mold is designed, and horizontal continuous casting is used to produce the aluminium alloy bar in this work. The results show that aluminium alloy bar can be cast by horizontal continuous casting. The asymmetry of the sump is overcome by optimizing the design of the mold. When the temperature of the melt was 730°C, casting speed is 650 mm/min, cooling water is 15 L/min, the quality of lubricating oil is 0.5 ml/min, and the ingot with good surface quality can be cast.

scholarly journals Root Cause Analysis of Surface Cracks in Heavy Steel Plates during the Hot Rolling Process

Metals ◽  
2019 ◽  
Vol 9 (7) ◽  
pp. 801 ◽  
Author(s):  
Abbas Bahrami ◽  
Mahdi Kiani Khouzani ◽  
Seyed Amirmohammad Mokhtari ◽  
Shahin Zareh ◽  
Maryam Yazdan Mehr
Keyword(s):  
Rolling Process ◽  
Processing Parameters ◽  
Constructional Steel ◽  
Steel Plates ◽  
Surface Cracks ◽  
Heavy Plate ◽  
Root Cause ◽  
Hot Rolling Process ◽  
Electron Microscopes ◽  
Hot Rolled

This paper investigates the root cause of the formation of surface cracks on hot-rolled C–Mn constructional steel heavy plates. Cracks are rather evenly distributed over the surface in the form of colonies of cracks. Samples were cut from the heavy plate. The microstructure of samples in the as-cast and hot-rolled states were studied using optical and electron microscopes as well as energy dispersive X-ray spectroscopy (EDS). Results show that cracks are heavily oxidized. De-carburized areas are also seen alongside cracks. The crack tip is in the form of a deer-horn, indicating that crack branching has taken place during deformation. The crack initiation sites are V-shaped grooves on the surface of as-cast slabs. Correlations between microstructures, processing parameters, and crack formation are discussed.

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