Microstructure and Texture Comparison of an Acicular Ferrite Pipeline Steel with Different Hot Rolling Process

2011 ◽  
Vol 399-401 ◽  
pp. 264-267
Author(s):  
Hai Yan Wang ◽  
Hui Ping Ren ◽  
Le Han ◽  
Zi Li Jin ◽  
Hao Sun
Keyword(s):  
Hot Rolling ◽  
Acicular Ferrite ◽  
Pipeline Steel ◽  
Orientation Distribution ◽  
Rolling Process ◽  
X80 Pipeline Steel ◽  
Hot Rolling Process ◽  
X80 Steel ◽  
Hot Rolled ◽  
Electron Back Scattered Diffraction

Microstructure of X80 pipeline steel with different hot rolling process was compared using Optical microscopy (OM), Bulk X-ray texture and micro orientation analysis was carried out by Orientation distribution function (ODF) and Electron back-scattered diffraction (EBSD), to analyze the various texture components of the pipeline steels under two different rolling processes. The results show that the final microstructures under the two schedules both present typical acicular ferrite characteristic. On the other side, the corresponding textures were found mainly comprised of two fibers in the rolling and normal direction in hot rolled X80 steel plate, there were obvious {112} , {110} , and {111} fiber, which seemed to be related with the mechanical properties anisotropy. Therefore, the influences of the microstructure and texture on the anisotropy were also discussed in this paper.

Effect of Hot Rolling on Microstructure and Texture Evolution of Mg-Li Based Alloy

2011 ◽  
Vol 690 ◽  
pp. 347-350 ◽  
Author(s):  
Vinod Kumar ◽  
Govind ◽  
Rajiv Shekhar ◽  
Kantesh Balani
Keyword(s):  
Hot Rolling ◽  
Texture Evolution ◽  
Rolling Process ◽  
Structural Features ◽  
Β Phase ◽  
Hot Rolling Process ◽  
Effect Of Hot Rolling ◽  
Hot Rolled ◽  
Increased Activity ◽  
Electron Back Scattered Diffraction

Mg-Li based alloy, namely Mg-9%Li-5%Al-3%Sn-1%Zn (LATZ9531) was cast and consequently hot rolled at ~573K. In the present study, as cast and hot rolled structural features has been investigated by scanning electron microscope and electron back scattered diffraction (EBSD). Phase analysis revealed presence of major Mg-rich α-phase and Li-rich β-phase. Significant crystallographic texture evolution due to conventional hot rolling process was observed due to the increased activity of the non-basal slip mode.

Experience of Hot Pack Rolling Application for Production of Specific Steels or Creep Resistant Alloys

2020 ◽  
Vol 989 ◽  
pp. 699-704
Author(s):  
Nikita S. Deryabin ◽  
Sergey M. Chernyshev ◽  
Sergey N. Veselkov
Keyword(s):  
Hot Rolling ◽  
Deformation Behavior ◽  
Import Substitution ◽  
Rolling Process ◽  
Plastic Range ◽  
Pack Rolling ◽  
Hot Rolling Process ◽  
Hot Rolled ◽  
Rolled Plates ◽  
Hot Pack

Under the current conditions, the consumption of special purpose alloys or steels is growing. This is due to the development of the import substitution program. It should be noted, that such materials possess specific deformation behavior, which requires providing particular conditions of a hot rolling process. One of the characteristics of the deformation behavior is the narrow thermal plastic range. Therefore, it is necessary to conduct a hot rolling in several stages, which include interchange of heating and rolling processes. For the purpose to resolve the issue, the experience of the multilayer hot rolling of plates has been investigated where all advantages of this way of a hot rolling process were used. Based on the method of the multilayer hot rolling, the pack rolling has been developed which gives the possibility of production of hot-rolled plates from special purpose alloys or steels.

Microstructures and Strength of Hot-Rolled Mg-Zn-Y Alloys

2011 ◽  
Vol 291-294 ◽  
pp. 137-140
Author(s):  
Yao Min Zhu ◽  
Qiu Ran Gao ◽  
Feng Zhang Ren ◽  
Shi Jie Fang
Keyword(s):  
Grain Size ◽  
Tensile Strength ◽  
Hot Rolling ◽  
Rolling Process ◽  
Recrystallization Process ◽  
Fine Grained ◽  
Hot Rolling Process ◽  
Fine Grained Structure ◽  
Cast Alloys ◽  
Hot Rolled

The effects of the hot-rolling process on microstructures and strength were investigated for two kinds of magnesium alloy Mg-Zn-Y and Mg-Zn-Y-Nd. In comparison with the as-cast alloys, the tensile strength of Mg-Zn-Y and Mg-Zn-Y-Nd both increases 45%, whereas their elongation decreases 73%, 60% via hot-rolling process, respectively. The results show that the dynamic recrystallization process and the pining effect of I-phase during hot rolling contribute to the fine-grained structure formation. The hot-rolling process has refined the grain size greatly.

Effect of Sn Addition on Corrosion Properties of As-Cast and Hot-Rolled AZ31 Magnesium Alloys

2017 ◽  
Vol 750 ◽  
pp. 124-128
Author(s):  
Yunus Turen ◽  
Didem Güzel ◽  
Huseyin Zengin ◽  
Yavuz Sun ◽  
Hayrettin Ahlatci
Keyword(s):  
Corrosion Resistance ◽  
Magnesium Alloy ◽  
Hot Rolling ◽  
Rolling Process ◽  
Az31 Magnesium Alloy ◽  
Corrosion Properties ◽  
Electric Resistance Furnace ◽  
Hot Rolling Process ◽  
Working Solution ◽  
Hot Rolled

In this study, the effect of Sn addition on corrosion resistance of as-cast and hot rolled AZ31 magnesium alloy was investigated. Sn additions were made by 0.2 wt%, 0.5 wt% and 1 wt%. An electric resistance furnace was used to produce alloys. Hot rolling process was performed at 350 °C by 40% thickness reduction at one rolling pass. Microstructure characterizations were performed by optical (OM) and scanning electron microscope (SEM). Immersion tests and electrochemical analyses were performed to investigate the corrosion resistance of the alloys. A 3.5% NaCl working solution at room temperature was used in both corrosion tests. The results showed that Sn addition decreased the primary dentrite size and restricted the growth of secondary dentritic arm. The as-cast structures transformed to dynamically recrystallized grain structures after hot-rolling process in all the alloys. Corrosion resistance of AZ31 magnesium alloy tended to decrease with Sn addition. This decrease was more clear in homogenized and hot-rolled states while there were some flactuations in as-cast states.

Microstructural Control of a Zn-22Al Alloy by Rolling Process

2012 ◽  
Vol 735 ◽  
pp. 289-294 ◽  
Author(s):  
Toshiaki Manaka ◽  
Goroh Itoh ◽  
Nguyen The Loc ◽  
Yoshinobu Motohashi ◽  
Takaaki Sakuma
Keyword(s):  
Grain Size ◽  
Hot Rolling ◽  
Rolling Process ◽  
Metallic Material ◽  
Alloy Ingot ◽  
Fine Grained ◽  
Hot Rolling Process ◽  
Hot Rolled ◽  
Microstructural Control

The Zn-22Al alloy with fine-equi-axed has been well known as a typical superplastic metallic material [1]. In the present study, The Zn-22Al alloy ingot of 20mm thickness was homogenized, either air-cooled or water-quenched, and then hot-rolled to a thickness of 2mm. Microstractural observation, showed that in the air-cooled specimens lammellar microstructure was formed after homogenization, and become fragmented to fine-grained microstructure as the hot rolling process proceeded. In the water-quenched specimens, equi-axed fine-grained microstructure with grain size under 2.1μm was attained and maintained throughout the hot rolling process.

The Toughness Index of X80 Mother Linepipe Steel and Its Optimum Microstructure

2008 ◽  
Author(s):  
Xiaoli Zhang ◽  
Yaorong Feng ◽  
Yinglai Liu ◽  
Chuanjing Zhuang
Keyword(s):  
Experimental Data ◽  
Acicular Ferrite ◽  
Pipeline Steel ◽  
Granular Bainite ◽  
X80 Pipeline Steel ◽  
Type Steel ◽  
Toughness Index ◽  
X80 Steel ◽  
Linepipe Steel ◽  
Selection Of

Large amount of experimental data indicated, that the index of CVN toughness and shearing area of mother pipe of X80 are (200J, 90%). And the results showed that when charpy toughness was closing to 200J, the shearing area would reach to 90%; when the charpy toughness increased continuously, the shearing area would not increase further more. So the selection of charpy toughness value as 200J for pipeline steels is reasonable, and also its corresponding shearing area. To gain thus component index, the optimum microstructure of X80 steel should be strip-like ferrite mastered, small amount of granular bainite contained-acicular ferrite type steel, and, in which the size of MA island should be less than 1μm. This kinds of optimum microstructure of X80 pipeline steel will exert its softening role in improving toughness and simultaneity not decrease its strength.

Microstructure and Texture Evolution during Hot Rolling of Mg-9Li-7Al-1Sn Alloy for Aerospace Application

2011 ◽  
Vol 702-703 ◽  
pp. 85-88
Author(s):  
Vinod Kumar ◽  
R. Balasubramaniam ◽  
Rajiv Shekhar ◽  
Kantesh Balani
Keyword(s):  
Hot Rolling ◽  
Texture Evolution ◽  
Rolling Process ◽  
Grain Structure ◽  
Aerospace Application ◽  
Β Phase ◽  
Hot Rolling Process ◽  
Α Phase ◽  
Hot Rolled ◽  
Increased Activity

In the present work, Mg - 9wt. % Li - 7% wt. Al – 1 wt. % Sn (LAT971) alloy was cast and hot rolled at ~573K. Phase analysis of LAT971 revealed the presence of dual phase structure namely Mg-rich α- and Li-rich β-phase. After hot rolling, it was observed that dynamic recrystallization led to refinement of the α-phase grain structure. Significant crystallographic texture evolution, characterized by electron backscatterd diffraction, revealed increased activity of the non-basal (101 ̅0) slip plane after conventional hot rolling process.

Study on the Asymmetric Hot Rolling of Aluminium Alloy Thick Plate

2014 ◽  
Vol 794-796 ◽  
pp. 1275-1280
Author(s):  
Yu Bo Zuo ◽  
Xing Fu ◽  
Jian Zhong Cui ◽  
Ping Wang ◽  
Lei Li ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Aluminium Alloy ◽  
Hot Rolling ◽  
Thick Plate ◽  
Rolling Process ◽  
Aviation Industry ◽  
Hot Rolling Process ◽  
Microstructure And Mechanical Properties ◽  
Hot Rolled ◽  
Asymmetric Hot Rolling

The development of aviation industry demands hot rolled aluminium alloy extra thick plates. However, it is quite difficult to obtain sufficient and uniform deformation of extra thick plate by conventional hot rolling process. The asymmetric hot rolling can generate an additional shear deformation and significantly improve the equivalent strain at the centre of the plate and consequently the uniformity of the microstructure, and mechanical properties. In the present work, the asymmetric rolling (ASR) was achieved by adjusting the diameters of the upper roll and the lower roll and was used to prepare hot rolled thick plate of an aluminium alloy. The effect of the asymmetric hot rolling process on the deformation, shape control, microstructure and mechanical properties was experimentally studied. The results showed that the ASR has a significant effect on metal deformation and can somehow refine microstructure and improve the uniformity of microstructure and properties although plate bending often happens during rolling process. This paper presents these results and gives corresponding discussions.

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