Thixoforming of Semisolid Slurry with High Fraction Solid Fabricated by Partial Melting of Commerical Wrought Aluminum Alloys

2019 ◽  
Vol 285 ◽  
pp. 210-218
Author(s):  
Ju Fu Jiang ◽  
Ying Zhe Liu ◽  
Guan Fei Xiao ◽  
Ying Wang
Keyword(s):  
Mechanical Properties ◽  
Partial Melting ◽  
Recrystallization Temperature ◽  
Rolled Plate ◽  
Continuous Heating ◽  
Semisolid Slurry ◽  
Semisolid State ◽  
High Fraction ◽  
Hot Rolled ◽  
Wrought Aluminum

Semisolid slurries of four wrought alloys were fabricated via partial melting of commerical wrought aluminum alloy. Thixoforming experiments of four typical parts were performed. The results showed that a large amount of equiaxed grains before soaking in semisolid state were created due to recrystallization occurred in the continuous heating from room temperature to a given temperature above recrystallization temperature. It provides a desirable microstructure to form spheroidal grains during the next soaking process in semisolid state. The microstructure of the 2A12,7A04 and 7075 semisolid slurry consisted of fine and spheroidal grains. The elongation of the thixoformed parts were higher those of the hot-rolled plate. The UTS of the thixoformed parts were close or ever higher than those of the hot-rolled plate. Although the grain size and roundness of the 5A06 semisolid slurry are not very desirable, the mechanical properties of the thixoformed part are close or ever than those of the hot-rolled plate. The high mechanical properties of the thixoformed parts further confirmed the feasibility of short-process thixoforming route

Correlation among Microstructure, Texture, and Properties along the Thickness Direction in As-Hot-Rolled and As-Solution-Quenched Al7055 Thick Plates

2021 ◽  
Vol 1026 ◽  
pp. 65-73
Author(s):  
Kai Zhu ◽  
Hong Wei Yan
Keyword(s):  
Mechanical Properties ◽  
Yield Strength ◽  
Tensile Tests ◽  
Rolled Plate ◽  
Uniaxial Tensile ◽  
Thickness Direction ◽  
Electron Backscattered Diffraction ◽  
Thick Plates ◽  
Aluminum Plates ◽  
Hot Rolled

Both microstructure inhomogeneity and mechanical property diversity along the thickness direction in rolled thick aluminum plates have been considered to have a remarkable impact on the performance and properties of the products made from the plates. In this study, scanning electron microscopy (SEM) and electron backscattered diffraction (EBSD) characterizations of microstructure and texture types along the thickness directions of Al7055 thick plate specimens prepared using two conditions, hot-rolling and solution-quenching, were performed. To examine the mechanical properties, uniaxial tensile tests were also carried out on specimens machined from both types of thick plates, using a layered strategy along the thickness direction. The results indicate that both the microstructure and mechanical properties are inhomogeneous under the two conditions. Furthermore, it is evident that there is a hereditary relationship between the mechanical properties of the two plates—areas with higher yield strength in the as-hot-rolled plate correspond to areas with the higher yield strength in the as-solution-quenched plate

Application of Quenching-Partitioning-Tempering Process in Hot Rolled Plate Fabrication

2010 ◽  
Vol 654-656 ◽  
pp. 82-85 ◽  
Author(s):  
Shu Zhou ◽  
Ying Wang ◽  
Nai Lu Chen ◽  
Yong Hua Rong ◽  
Jian Feng Gu
Keyword(s):  
Mechanical Properties ◽  
Retained Austenite ◽  
High Strength Steels ◽  
High Strength ◽  
Significant Fraction ◽  
Rolled Plate ◽  
Quenching And Partitioning ◽  
Good Ductility ◽  
Hot Rolled ◽  
Rolled Plates

The quenching-partitioning-tempering (Q-P-T) process, based on the quenching and partitioning (Q&P) treatment, has been proposed for producing high strength steels containing significant fraction of film-like retained austenite and controlled amount of fine martensite laths. In this study, a set of Q-P-T processes for C-Mn-Si-Ni-Nb hot rolled plates are designed and realized. The steels with Q-P-T processes present a combination of high strength and relatively good ductility. The origin of such mechanical properties is revealed by microstructure characterization.

Effect of Finishing Temperature on Mechanical Properties of a Nb-Microalloyed Steel Sheet

2010 ◽  
Vol 129-131 ◽  
pp. 1022-1028
Author(s):  
Daavood Mirahmadi Khaki ◽  
A. Akbarzadeh ◽  
Amir Abedi
Keyword(s):  
Mechanical Properties ◽  
Microalloyed Steel ◽  
Total Elongation ◽  
Controlled Rolling ◽  
Recrystallization Temperature ◽  
Effective Parameters ◽  
Steel Sheets ◽  
Intercritical Range ◽  
Nb Microalloyed Steel ◽  
Hot Rolled

Thermo mechanical processing and controlled rolling of microalloyed steel sheets are affected by several factors. In this investigation, finishing temperature of rolling which is considered as the most effective parameters on the final mechanical properties of hot rolled products has been studied. For this purpose, three different finishing temperatures of 950, 900 and 850 °C below the non-recrystallization temperature and one temperature of 800 °C in the intercritical range were chosen. It is observed that decreasing the finishing temperature causes increase of strength and decrease of total elongation. This is accompanied by more grain refinement of microstructure and the morphology was changed from polygonal ferrite to acicular one. Findings of this research provide suitable connection among finishing temperature, microstructural features, and mechanical properties of hot rolled Nb-microalloyed steel sheets.

Effect of Modes of Rolling on Mechanical Properties, Texture and Ballistic Performance of Al-7017 Alloy

2011 ◽  
Vol 702-703 ◽  
pp. 979-982
Author(s):  
Pradipta Kumar Jena ◽  
Chandan Mondal ◽  
K. Siva Kumar ◽  
A.K. Singh
Keyword(s):  
Mechanical Properties ◽  
Hot Rolling ◽  
Charpy Impact ◽  
Rolled Plate ◽  
Ballistic Performance ◽  
Rolled Material ◽  
Hot Rolled ◽  
Hot Rolling Conditions

This study describes the influence of texture and associated mechanical properties on ballistic performance of Aluminium-7017 alloy in two different (unidirectional and clock) hot rolling conditions. The change in texture has been explained in terms of β fiber in hot rolled and T6 tempered condition. A marginal variation in strength and hardness is observed with changing the mode of rolling, whereas Charpy impact values are found to be varying considerably. Results show that the unidirectional rolled material exhibits improved ballistic performance than that of the clock rolled plate. This has been attributed to different textures present in both the plates.

Influence of Boron on Mechanical Properties and Microstructures of Hot-Rolled Interstitial Free Steel

2005 ◽  
Vol 495-497 ◽  
pp. 537-542 ◽  
Author(s):  
S.I. Kim ◽  
Shi Hoon Choi ◽  
Yeon Chul Yoo
Keyword(s):  
Mechanical Properties ◽  
High Strength ◽  
Recrystallization Temperature ◽  
Interstitial Free ◽  
If Steel ◽  
Softening Behavior ◽  
Axial Tensile ◽  
Dynamic Softening ◽  
Work Hardening Rate ◽  
Hot Rolled

This paper examines an effect of boron (B) on dynamic softening behavior, mechanical properties and microstructures for Nb-Ti added high strength interstitial free (IF) steel. For this purpose, IF steels containing 0ppm B, 5ppm B and 30ppm B were chosen. Continuous cooling compression test was performed to investigate dynamic softening behavior. Mechanical properties and microstructures of pilot hot-rolled IF steel sheet were analyzed by uni-axial tensile test and electron back-scattered diffraction (EBSD). It was found that no-dynamic recrystallization temperature (Tndrx) which can be determined from the relationship between flow stress and temperature is a constant of 955oC for all IF steels. However, an addition of B into IF steels increases work hardening rate at the temperature below Tndrx. It was also verified that B retards phase transformation of austenite into ferrite. EBSD analysis revealed that absence of B induces fine ferrite grain size and many high angle grain boundaries.

Effect of Cooling Rate on Mechanical Properties of 7075 Aluminum Rods Extruded in Semisolid State

2014 ◽  
Vol 136 (2) ◽  
Author(s):  
Mostafa Ketabchi ◽  
Mohammad Amin Shafaat ◽  
Iman Shafaat ◽  
Mahmoud Abbasi
Keyword(s):  
Mechanical Properties ◽  
Partial Melting ◽  
Tensile Properties ◽  
Cooling Rate ◽  
Metallic Alloys ◽  
Holding Time ◽  
Experimental Results ◽  
Liquid Matrix ◽  
Semisolid State ◽  
Semisolid Forming

Semisolid extrusion of metals involves extrusion of metallic alloys with a microstructure consisting of spherical solids in a liquid matrix. In this research, the effect of cooling rate during forward semisolid extrusion on microstructure and mechanical properties of 7075 aluminum was investigated. Semisolid microstructure was prepared according to the recrystallization and partial melting (RAP) method. Optimum semisolid temperature and holding time which were resulted in a suitable microstructure for specimens were determined at 580 °C for 10 min. Different cooling rates were applied during semisolid extrusion and the resulted mechanical properties were studied. Tensile properties of semisolid extruded rods in T6 condition were also compared with those of conventionally extruded specimen. The results indicate that utilizing optimum values of semisolid extrusion parameters, namely, temperature and time of heating as well as cooling rate severity, brings both the possibility to obtain mechanical properties of conventionally extruded specimens and to get advantages of semisolid forming technique. Experimental results also show that increment of cooling rate and extrusion pressure improves the mechanical properties.

Influence of Steel Chemical Composition and Modes of the Thermomechanical Treatment on Mechanical Properties of a Hot Rolled Plate

2016 ◽  
Vol 870 ◽  
pp. 584-592
Author(s):  
V.M. Salganik ◽  
D.N. Chikishev ◽  
E.B. Pozhidaeva
Keyword(s):  
Mechanical Properties ◽  
Chemical Composition ◽  
Process Parameters ◽  
Low Cost ◽  
Rolled Plate ◽  
Microalloyed Steels ◽  
Neural Network Modeling ◽  
Element Analysis ◽  
The Neural Network ◽  
Hot Rolled

A mathematical model for calculation of rolling pipe mechanical properties has been developed. The influence of alloying elements in steel by means of optimal process parameters of thermomechanical rolling was analyzed. There are two methods of mathematical modeling used in the study: the neural network modeling used to select the optimal chemical composition and the finite element analysis used to optimize the process parameters. Due to large availability, low cost and high accuracy of the results, these methods are considered to be the most promising ones. Two ways to reduce the cost of a hot-rolled plate from microalloyed steels have been developed. A complex of technological processing replacement was developed.

Improving the mechanical properties of hot-rolled plate steel 10KhSND

Metallurgist ◽  
1988 ◽  
Vol 32 (1) ◽  
pp. 41-42
Author(s):  
N. M. Khoroshilov ◽  
S. A. Pikulin ◽  
V. G. Abakumov ◽  
V. V. Ved' ◽  
B. A. Dvoryadkin ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Rolled Plate ◽  
Plate Steel ◽  
Steel 10Khsnd ◽  
Hot Rolled
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