The Basic Mechanical Properties and Experimental Verification for Hot Forming Steel

2012 ◽  
pp. 47-67
Author(s):  
Ping Hu ◽  
Ning Ma ◽  
Li-zhong Liu ◽  
Yi-Guo Zhu
Keyword(s):  
Mechanical Properties ◽  
Experimental Verification ◽  
Hot Forming

Modelling and experimental verification of mechanical properties of cotton knitted fabric composites

2011 ◽  
Vol 17 (1) ◽  
pp. 39 ◽  
Author(s):  
O Kononova ◽  
A Krasnikovs ◽  
K Dzelzitis ◽  
G Kharkova ◽  
A Vagel ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Experimental Verification ◽  
Knitted Fabric ◽  
Fabric Composites ◽  
Cotton Knitted Fabric

scholarly journals Development of a partition panel of an Al6061 sheet metal part for the improvement of formability and mechanical properties by hot forming quenching

2017 ◽  
Vol 9 (2) ◽  
pp. 168781401769121 ◽  
Author(s):  
Dae-Cheol Ko ◽  
Dae-Hoon Ko ◽  
Jae-Hong Kim ◽  
Joon-Hong Park
Keyword(s):  
Mechanical Properties ◽  
High Performance ◽  
Preliminary Test ◽  
Hot Forming ◽  
Aluminum Sheets ◽  
Heat Treated ◽  
Quenching Process ◽  
Automotive Part ◽  
Formed Part ◽  
Quench Factor Analysis

In this study, the hot forming quenching process was investigated to improve the deficiencies that arise in materials subjected to conventional cold stamping, such as low formability and undesirable mechanical properties. The hot forming quenching process was mainly discussed in terms of formability and mechanical properties in this study and was first evaluated by preliminary tests. To examine formability, an evaluation was conducted using hot-tensile and hemispherical-dome stretching tests at temperatures of 350°C and 450°C, respectively. In addition, the mechanical properties of the formed part were predicted using quench factor analysis, which was based on the cooling temperature during the die quenching process. These preliminary test results were then used to predict the formability and hardness of the partition panel of an automotive part, where the analytical results indicated high performance of the hot forming quenching process, in contrast to conventional forming. Finally, the hot forming quenching experiment of the partition panel was carried out to validate the predicted results and the obtained formability and hardness values were compared with conventional forming at room temperature using T4 and T6 heat-treated sheets. The analytical and experimental results indicate that the hot forming quenching process is a very effective method for obtaining desirable formability and mechanical properties in the forming of aluminum sheets.

scholarly journals In-Depth Comparison of an Industrially Extruded Powder and Ingot Al Alloys

Metals ◽  
2020 ◽  
Vol 10 (11) ◽  
pp. 1483
Author(s):  
David Bombač ◽  
Peter Cvahte ◽  
Martin Balog ◽  
Goran Kugler ◽  
Milan Terčelj
Keyword(s):  
Mechanical Properties ◽  
Hot Extrusion ◽  
Hot Compression ◽  
Hot Forming ◽  
Compression Tests ◽  
Extrusion Press ◽  
Conventional Aluminum Alloy ◽  
Al Powder ◽  
Thermal Stability Of ◽  
Suitable Process

An industrial press was used to consolidate compacted aluminum powder with a nominal diameter in the range of 1 µm. Direct and indirect hot-extrusion processes were used, and suitable process parameters were determined from heating conditions, ram speeds and billet temperatures. For comparison, a direct-extrusion press for hot extrusion of a conventional aluminum alloy AA 1050 was used. The extruded Al powder showed better mechanical properties and showed a thermal stability of the mechanical properties after annealing treatments. To increase the theoretical density of the directly extruded Al powder, single-hit hot-compression tests were carried out. Activation energies for hot forming were calculated from hot-compression tests carried out in the temperature range 300–580 °C, at different strain rates. Processing maps were used to demonstrate safe hot-working conditions, to obtain an optimal microstructure after hot forming of extruded Al powder.

Operating stability and mechanical properties of type 5Kh2SF steels for hot-forming dies

1984 ◽  
Vol 26 (8) ◽  
pp. 613-615
Author(s):  
Yu. V. Shakhnazarov ◽  
A. S. Zhuravlev ◽  
E. D. Orlov ◽  
A. P. Vasil'ev
Keyword(s):  
Mechanical Properties ◽  
Hot Forming ◽  
Operating Stability

Effect of Process Parameters on Microstructure and Properties of 1500 MPa Grade Hot Formed Steel without Boron but Containing Niobium

2019 ◽  
Vol 944 ◽  
pp. 283-293
Author(s):  
Zhen Nan Cui ◽  
Yong Lin Kang ◽  
Guo Ming Zhu ◽  
Bao Shun Li ◽  
Quan Quan Qiu ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Steel Sheet ◽  
Heating Temperature ◽  
Residual Austenite ◽  
Hot Forming ◽  
Rolled Sheet ◽  
X Ray Diffraction ◽  
Quenching Temperature ◽  
New Type ◽  
Cold Rolled

In this paper, a new type of automotive 1500 MPa grade hot-formed steel without boron but containing niobium was subjected to thermoforming experiments. The phase transition point and Continuous Cooling Transformation (CCT) curve of the hot-formed steel were measured by thermal dilatometer, and then the best austenitizing parameters was determined. The microstructure of the cold-rolled sheet and the hot-formed steel sheet were observed by electron microscopy. The microstructure of the steel sheet after hot forming was studied by X-ray diffraction (XRD) method to determine whether the microstructure after hot forming had residual austenite. The influence of residence conditions on its mechanical properties was studied. The experimental results has shown that the microstructure of the original cold-rolled sheet is mainly composed of ferrite and pearlite. After thermoforming, the basic microstructure are martensite and a small amount of ferrite; When the hot forming parameters is that 900 °C of the heating temperature, 3 min of the holding time, 8 s of the residence time, quenching temperature is the room temperature, the new 1500 MPa grade hot formed steel has the best mechanical properties that the tensile strength is 1519 MPa, the yield strength is 1060 MPa, the yield ratio is 0.73, and the elongation reaches 10.52%. The result shows that the new 1500 MPa grade hot formed steel could obtain excellent mechanical properties through a reasonable process under the premise of ensuring hardenability.

Measuring the elastic modulus and residual stress of freestanding thin films using nanoindentation techniques

2009 ◽  
Vol 24 (9) ◽  
pp. 2974-2985 ◽  
Author(s):  
Erik G. Herbert ◽  
Warren C. Oliver ◽  
Maarten P. de Boer ◽  
George M. Pharr
Keyword(s):  
Thin Films ◽  
Mechanical Properties ◽  
Residual Stress ◽  
Thermal Expansion ◽  
Elastic Modulus ◽  
Dimensional Analysis ◽  
Experimental Verification ◽  
Cu Films ◽  
Proposed Model ◽  
The Difference

A new method is proposed to determine the elastic modulus and residual stress of freestanding thin films based on nanoindentation techniques. The experimentally measured stiffness-displacement response is applied to a simple membrane model that assumes the film deformation is dominated by stretching as opposed to bending. Dimensional analysis is used to identify appropriate limitations of the proposed model. Experimental verification of the method is demonstrated for Al/0.5 wt% Cu films nominally 22 µm wide, 0.55 µm thick, and 150, 300, and 500 µm long. The estimated modulus for the four freestanding films match the value measured by electrostatic techniques to within 2%, and the residual stress to within 19.1%. The difference in residual stress can be completely accounted for by thermal expansion and a modest change in temperature of 3 °C. Numerous experimental pitfalls are identified and discussed. Collectively, these data and the technique used to generate them should help future investigators make more accurate and precise measurements of the mechanical properties of freestanding thin films using nanoindentation.

Effect of hot forming on anisotropy of mechanical properties of high-temperature 901 alloy

2021 ◽  
pp. 459-463
Author(s):  
A.V. Pchel'nikov ◽  
V.A. Filyakova ◽  
A.A. Sidorov
Keyword(s):  
Mechanical Properties ◽  
Plastic Deformation ◽  
High Temperature ◽  
Hot Forming ◽  
Test Results ◽  
Initial Blank ◽  
Anisotropy Of Mechanical Properties

The effect of the macrostructure drawing after forming of blank made of high-temperature 901 alloy on the anisotropy of mechanical properties is studied. The effect of drawing on anisotropy is considered taking into account the unevenness of plastic deformation during upsetting and taking into account the deformation accumulated during the forging of the rod for the initial blank. The results of upsetting simulation and the test results of the samples mechanical properties cut in different directions of the blank fiber are presented.

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