scholarly journals Texture Distributions Through the Thickness of an ELC-BH Sheet With Very High r¯-Value Produced by a New Technology

1998 ◽  
Vol 30 (3-4) ◽  
pp. 229-245
Author(s):  
Xiaojun Guan ◽  
Jiajuan Zhou ◽  
Xiaojun Hu ◽  
Qiulin Wu
Keyword(s):  
New Technology ◽  
Sheet Steel ◽  
High Strength ◽  
Fiber Axis ◽  
Rolled Sheet ◽  
Low Carbon ◽  
Annealing Texture ◽  
Cold Rolling And Annealing ◽  
Cold Rolled ◽  
Very High

Effects of a new technology which made r¯-value increase remarkably on the distributions of the cold rolling and annealing textures through the thickness of an extra low-carbon and high strength bake-hardening sheet steel have been researched by means of the method of ODF. The results are expressed as follows: (1) γ-fiber axis texture in the ELC-BH sheet obtained by the new technology develops so strongly and purely, especially within the sheet. This is the essential cause why r¯-value of the sheet remarkably increases. (2) The very strong γ-fiber axis texture of being completely different from conventional one is closely related to the cold rolled sheet supplied by the new technology which benefits to develop {111} annealing texture strongly. The inside of the cold rolled sheet is far more favorable than its surface to the development of the γ-fiber axis texture.

scholarly journals Investigation on the Texture of an ELC-BH Sheet With Very High R−-Value Processed by New Technology

1995 ◽  
Vol 23 (1) ◽  
pp. 21-27 ◽  
Author(s):  
Guan Xiaojun ◽  
Wang Xianjin ◽  
Wu Qiulin ◽  
Hu Xiaojun
Keyword(s):  
Cold Rolling ◽  
New Technology ◽  
Sheet Steel ◽  
Rolling Texture ◽  
High Strength ◽  
Low Carbon ◽  
Annealing Texture ◽  
Cold Rolling And Annealing ◽  
Cold Rolling Texture ◽  
Very High

The texture of an extra low-carbon and high strength bake-hardening sheet steel (i.e. ELC-BH sheet) processed in our laboratory through a new invented technology has been investigated by means of ODF method, so that the cause of the very high r¯-value of this sheet has been discovered. Experimental results are shown as follows: ① The r¯-value of the experimental sheet treated by the new process is as high as 2.67 and this is the highest r¯-value published so far for phosphorus – added high strength and deep drawing sheet steels. At the same time, the contradiction between deep-drawability and strengthening is successfully solved too. ② A nucleus of the new technology is supplying a good cold rolled parent state which benefits to the development of {111} annealing textures through controlling texture, while strong development of {111} annealing textures can cause very high r¯-value. ③ The cold rolling and annealing texture obtained by the new technology are quite different as compared with that of conventional process. New cold rolling texture has stronger {111} components and weaker {100} components than conventiopnal cold rolling texture. The concentrations of {111} components of new annealing texture are not only distinctly general increase but also the crystal orientations corresponding to the peak values of orientation concentrations of the texture have been also changed from conventional (1¯11)[11¯2] orientations to (1¯11)[01¯1] orientations.

scholarly journals Development of Texture in an ELC-BH Sheet With Very High R¯-Value During Annealing

1995 ◽  
Vol 25 (1) ◽  
pp. 63-70
Author(s):  
Xiaojun Guan ◽  
Xiaojun Hu ◽  
Qiulin Wu ◽  
Ke Yu
Keyword(s):  
New Technology ◽  
Sheet Steel ◽  
Nucleation And Growth ◽  
Rolled Sheet ◽  
Stored Energy ◽  
Texture Change ◽  
Conventional Technology ◽  
Structure Observation ◽  
Cold Rolled ◽  
Very High

The texture change in an ELC-BH sheet steel with very high r¯ value produced through a new technology invented in our laboratory during annealing has been successfully investigated by means of the methods of ODF analysis and metallographic structure observation in this paper. Thus, the developmental law of the texture which consists of even stronger {111} texture with main {111} < 110 > components as compared with that of texture in conventional technology during annealing has been discovered. The experimental results are described as follows: 1) It is different from conventional technology that the velocity of both nucleation and growth to the recrystallization grains of {111} < 110 > orientations is always larger than that of {111} < 112 > orientations. 2) The cause why this law is engendered may be related to that the advantage, that cold deforming stored energy of {111} < 110 > orientation grains is higher than that of {111} < 112 > orientation grains, is brought into fully play in the cold rolled sheet with stronger {111} texture during annealing.

Continuous Cooling Transformation Behavior of High Strength Low-Alloyed Cold Rolled Sheet Steel

2007 ◽  
Vol 26-28 ◽  
pp. 27-31 ◽  
Author(s):  
Hao Liu ◽  
Ding Zhong Zhong ◽  
Long Qi Zhao ◽  
Tao Peng ◽  
Li Xin Wu ◽  
...  
Keyword(s):  
Phase Transformation ◽  
Sheet Steel ◽  
High Strength ◽  
Deformation Condition ◽  
Rolled Sheet ◽  
Transformation Temperatures ◽  
Continuous Cooling Transformation ◽  
Continuous Cooling ◽  
Critical Phase ◽  
Cold Rolled

The dilatometry curves and the critical phase transformation temperatures of high strength low-alloyed (HSLA) cold rolled sheet steel were determined by thermal simulation test machine. The samples were austenitized at 900°C,deformed at 40% of deformation and cooled at different rates of 0.1°C/s~ 60°C/s. The continuous cooling transformation (CCT) diagram under deformation condition can be drawn. The results showed that the critical phase transformation temperatures are as follows: Ac3=900°C, Ac1=735°C, Ar3=825°C, Ar1=695°C. A few amount of martensite in high strength low-alloyed cold rolled steel can be obtained at the cooling rate of 60°C/s. The experimental data provide the technical references for rolling control, cooling control and heat treatment in real production.

α→γ→α Transformation Texture Formation at Cold-Rolled Ultra Low Carbon Steel Surfaces

2005 ◽  
Vol 495-497 ◽  
pp. 1267-1272 ◽  
Author(s):  
Naoki Yoshinaga ◽  
Leo Kestens ◽  
Bruno C. De Cooman
Keyword(s):  
Carbon Steel ◽  
Surface Texture ◽  
Alternative Hypothesis ◽  
Sheet Steel ◽  
Low Carbon Steel ◽  
Rolled Sheet ◽  
Texture Formation ◽  
Low Carbon ◽  
Ultra Low Carbon Steel ◽  
Cold Rolled

The influence of Mn on the surface texture formation through a®g®a transformation was investigated. After the a®g®a transformation, a weak texture was formed at the surface of ultra low carbon cold-rolled sheet steel without Mn. In contrast, a sharp <100>//ND cube texture was observed in Mn alloyed ultra low carbon steel. In order to interpret the effect of Mn two alternative mechanisms were considered : (i) one assumption attributes the occurrence of the specific surface texture to the effect of outer-surface energy (ii) and according to an alternative hypothesis the release of elastic work parallel to ND in the surface area is responsible for the observed <100>//ND surface texture.

Development of a Formable Low Carbon Columbium Bearing High Strength Hot Rolled Sheet Steel

1974 ◽  
Author(s):  
W. E. Heitmann ◽  
R. R. Hilsen ◽  
P. L. Manganon ◽  
T. E. Moss
Keyword(s):  
Sheet Steel ◽  
High Strength ◽  
Rolled Sheet ◽  
Low Carbon ◽  
Hot Rolled

scholarly journals Influence of Solute C on Recrystallization Behavior in Ti Added Low Carbon Cold Rolled Sheet Steel

2008 ◽  
Vol 94 (5) ◽  
pp. 179-187 ◽  
Author(s):  
Natsuko Sugiura ◽  
Naoki Yoshinaga ◽  
Kaoru Kawasaki ◽  
Yukiko Yamaguchi ◽  
Jun Takahashi ◽  
...  
Keyword(s):  
Sheet Steel ◽  
Rolled Sheet ◽  
Recrystallization Behavior ◽  
Low Carbon ◽  
Cold Rolled

scholarly journals Formable Cold Rolled Sheet Steel with Ultra-High Lankford Value by Elevating {111} Intensity Extremely.

1992 ◽  
Vol 31 (6) ◽  
pp. 535-537 ◽  
Author(s):  
Kazuo Koyama ◽  
Yoshikazu Matsumura ◽  
Shiroh Sanagi ◽  
Nobuhiko Matsuzu ◽  
Nobuyuki Kino
Keyword(s):  
Sheet Steel ◽  
Rolled Sheet ◽  
Cold Rolled

The Study on the Fabrication of Nano-Structured Steel by Cold Rolling and Annealing of Martensite

2013 ◽  
Vol 634-638 ◽  
pp. 1807-1810
Author(s):  
Guang Xu ◽  
Jing Yang ◽  
Tao Xiong ◽  
Peng Deng ◽  
Long Fei Cao
Keyword(s):  
Grain Size ◽  
Cold Rolling ◽  
High Strength ◽  
Total Elongation ◽  
Plain Carbon Steel ◽  
Mean Grain Size ◽  
Cold Rolling And Annealing ◽  
The Mean ◽  
Martensite Microstructure ◽  
Very High

Sub-nano structured steel was obtained by cold rolling and annealing martensite microstructure for a plain carbon steel. The mean grain size is several hundreds nanometer. The steel has very high strength and also good total elongation.

scholarly journals Assessment of the Hardening Behavior and Tensile Properties of a Cold-Rolled Bainitic–Ferritic Steel

Materials ◽  
2021 ◽  
Vol 14 (21) ◽  
pp. 6662
Author(s):  
Emilio Bassini ◽  
Antonio Sivo ◽  
Daniele Ugues
Keyword(s):  
Strain Hardening ◽  
High Strength ◽  
Dual Phase ◽  
Low Carbon ◽  
Soft Phase ◽  
Bending Tests ◽  
Ductile Materials ◽  
Hardening Behavior ◽  
Material State ◽  
Cold Rolled

The automotive field is continuously researching safer, high-strength, ductile materials. Nowadays, dual-phase (DP) steels are gaining importance, since they meet all these requirements. Dual-phase steel made of ferrite and bainite is the object of a complete microstructural and mechanical characterization, which includes tensile and bending tests. This specific steel contains ferrite and bainite in equal parts; ferrite is the soft phase while bainite acts as a dispersed reinforcing system. This peculiar microstructure, together with fine dispersed carbides, an extremely low carbon content (0.09 wt %), and a minimal degree of strain hardening (less than 10%) allow this steel to compete with traditional medium-carbon single-phase steels. In this work, a full pearlitic C67 steel containing 0.67% carbon was used as a benchmark to build a comparative study between the DP and SP steels. Moreover, the Crussard–Jaoul (C-J) and Voce analysis were adopted to describe the hardening behavior of the two materials. Using the C-J analysis, it is possible to separately analyze the ferrite and bainite strain hardening and understand which alterations occur to DP steel after being cold rolled. On the other hand, the Voce equation was used to evaluate the dislocation density evolution as a function of the material state.

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