Novel processes for producing ultra-fine grained steel sheets

2007 ◽  
Vol 104 (2) ◽  
pp. 91-97
Author(s):  
T. Hiruta ◽  
Y. Matsubara ◽  
N. Nakata ◽  
M. Miyake ◽  
T. Kuroki ◽  
...  
Keyword(s):  
Fine Grained ◽  
Steel Sheets ◽  
Novel Processes

Tensile Testing of Ultra-Fine Grained Extra Deep Drawing Steel Sheets

2017 ◽  
Vol 4 (2) ◽  
pp. 590-595 ◽  
Author(s):  
R. Pratoori ◽  
T.S. Maddukuri ◽  
A.K. Sannidhi ◽  
Y.P. Singh ◽  
B. Gundepudi ◽  
...  
Keyword(s):  
Deep Drawing ◽  
Tensile Testing ◽  
Fine Grained ◽  
Steel Sheets

scholarly journals Use of Fine-Grained Heat-Strengthened Steels to Increase the Operation Qualities of Bunker Capacities from Thin-Walled Galvanized Profiles

2021 ◽  
pp. 84-93
Author(s):  
Y. I. Hezentsvei ◽  
D. O. Bannikov
Keyword(s):  
Low Temperatures ◽  
High Strength Steels ◽  
High Strength ◽  
Numerical Calculations ◽  
Structural Scheme ◽  
Plan View ◽  
Fine Grained ◽  
Steel Sheets ◽  
Stiffening Ribs ◽  
Corrugated Sheets

Purpose. The work is aimed to study the use efficiency of fine-grained heat-strengthened steels (mainly 10G2FB) for steel bunker capacities. At the same time, the structural scheme of such a structure using corrugated steel sheets is considered as the main variant. Methodology. To achieve this purpose, a series of numerical calculations was carried out for a steel bunker capacity of a pyramidal-prismatic type with overall dimensions in plan view of 6×5.2 m and a total height of 4.5 m. The capacity was designed for complicated working conditions, in particular, increased loads, including long-term dynamic ones. The potential possibility of operating the container under conditions of high or low temperatures was also taken into account. At the same time, both the traditional structural scheme of a bunker capacity with horizontal stiffening ribs and the developed structural scheme based on corrugated steel sheets were analyzed. The calculations were carried out by the finite element method based on the SCAD for Windows project complex. Findings. Based on the results of the analysis and comparison of the data obtained in numerical calculations, it was found that the use of fine-grained heat-strengthened high-strength steels (for example, steel 10G2FB) for bunker capacities, both the traditional structural scheme with stiffening ribs and the developed structural scheme based on corrugated sheets, allows reducing material consumption by about 30% in both cases. At the same time, due to the good performance of fine-grained heat-strengthened steel 10G2FB, both at high and at low temperatures, it can be effectively used for steel bunker capacities that work in difficult conditions. Originality. The possibility and efficiency of the use of fine-grained, heat-strengthened high-strength steels for the construction of a steel bunker capacity is estimated. At the same time, such an estimation was given not only for structures of the traditional structural scheme with horizontal stiffening ribs, but also for bunkers with a developed structural scheme based on corrugated sheets. Practical value. From a practical point of view, quantitative parameters of the stress-strain state were obtained during investigations of various design variants for a steel bunker capacity. The data are presented in a compact form that is easy to evaluate and compare. They allow us to state about the improvement of the operation characteristics of capacities and the potential reduction of the risks of their failures and accidents during operation.

Magnetic properties of fine-grained doubly oriented Si steel sheets

2003 ◽  
Vol 93 (10) ◽  
pp. 6680-6682 ◽  
Author(s):  
T. Tomida ◽  
N. Sano ◽  
S. Hinotani
Keyword(s):  
Magnetic Properties ◽  
Fine Grained ◽  
Steel Sheets

scholarly journals Hot Forming of Ultra-Fine-Grained Multiphase Steel Products Using Press Hardening Combined with Quenching and Partitioning Process

Metals ◽  
2019 ◽  
Vol 9 (3) ◽  
pp. 357 ◽  
Author(s):  
Esa Vuorinen ◽  
Almila Özügürler ◽  
John Ion ◽  
Katarina Eriksson ◽  
Mahesh Somani ◽  
...  
Keyword(s):  
High Strength ◽  
Hot Forming ◽  
Low Carbon ◽  
X Ray Diffraction ◽  
Quenching And Partitioning ◽  
Press Hardening ◽  
Fine Grained ◽  
Steel Sheets ◽  
High Silicon ◽  
Multiphase Steel

Hot forming combined with austempering and quenching and partitioning (QP) processes have been used to shape two cold rolled high silicon steel sheets into hat profiles. Thermal simulation on a Gleeble instrument was employed to optimize processing variables to achieve an optimum combination of strength and ductility in the final parts. Microstructures were characterized using optical and scanning electron microscopy and X-ray diffraction. Tensile strengths (Rm) of 1190 and 1350 MPa and elongations to fracture (A50mm) of 8.5 and 7.4%, were achieved for the two high-silicon steels having 0.15 and 0.26 wt % C, respectively. Preliminary results show that press hardening together with a QP heat treatment is an effective method of producing components with high strength and reasonable tensile ductility from low carbon containing steels that have the potential for carbide free bainite formation. The QP treatment resulted in faster austenite decomposition during partitioning in the steels in comparison with an austempering treatment.

scholarly journals Laminated TRIP/TWIP Steel Composites Produced by Roll Bonding

Metals ◽  
2019 ◽  
Vol 9 (2) ◽  
pp. 195 ◽  
Author(s):  
Yangxi Qiu ◽  
Nico Kaden ◽  
Matthias Schmidtchen ◽  
Ulrich Prahl ◽  
Horst Biermann ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Adhesive Bonding ◽  
Twip Steel ◽  
Bonding Process ◽  
High Alloy ◽  
Roll Bonding ◽  
Fine Grained ◽  
Steel Sheets ◽  
Bonded Composite ◽  
Peel Tests

In order to investigate the roll bonding of high-alloy transformation induced plasticity (TRIP) and twinning induced plasticity (TWIP) steel, roll-bonded sheets of the TRIP and TWIP steel were manufactured starting from hot rolling, followed by brushing and cold rolling. Both, the microstructure and mechanical properties of the roll-bonded sheets were characterized by metallographic investigations, and tensile and T-peel tests. Preliminary results, such as an occurrence of an adhesive bonding between two TWIP steel sheets and between TRIP and TWIP steel sheet after a thickness reduction of approximately 50% were obtained. Moreover, the formation of deformation-induced martensite leads to outstanding mechanical properties of the roll-bonded composite sheet. An ultra-fine grained microstructure was observed in the bonding zone after only one roll-bonding process. The obtained promising results demonstrate the possibility of the development of an accumulative roll-bonding process for TRIP/TWIP steel composites.

Study of Texture in Ultra Fine Grained Dual Phase Steel Sheets

2011 ◽  
Vol 702-703 ◽  
pp. 806-809
Author(s):  
Papa Rao Mondi ◽  
R. Madhavan ◽  
V. Subramanya Sarma ◽  
S. Sankaran
Keyword(s):  
Cold Rolling ◽  
Dual Phase Steel ◽  
Intercritical Annealing ◽  
Rolling Direction ◽  
Dual Phase ◽  
Fine Grained ◽  
Steel Sheets ◽  
Cold Rolling And Annealing ◽  
Nb Microalloyed Steel ◽  
Cold Rolled

Severe cold rolling and short intercritcal annealing is often used to produce ultra-fine grained ferrite and martensite dual phase steels. In this paper, microstructure and texture of Nb-microalloyed steel following cold rolling and short intercritical annealing is investigated. The results show that cold rolling and annealing resulted in ultra-fine grained dual phase steel consisted of polygonal ferrite in the range of ~1-2 μm in size. In cold rolled material, the texture components are γ fiber (//normal direction) and α fiber (//rolling direction). Partial recrystallization texture was observed following intercritical annealing.

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