Texture evolution of 440 MPa grade Nb-bearing high strength IF steel during rolling and annealing process

2011 ◽  
Vol 26 (6) ◽  
pp. 1157-1161 ◽  
Author(s):  
Yinli Chen ◽  
Lan Su ◽  
Aimin Zhao ◽  
Yaobing Li ◽  
Benhai Li ◽  
...  
Keyword(s):  
Texture Evolution ◽  
High Strength ◽  
Annealing Process ◽  
If Steel ◽  
High Strength If Steel

Microtexture Study of Warm-Rolled High Strength Interstitial-Free (IF) Steel Sheets

2011 ◽  
Vol 682 ◽  
pp. 71-74
Author(s):  
Cai Nian Jing ◽  
Ming Gang Wang ◽  
Xi Jun Liu ◽  
Qi Zhong Tan ◽  
Zuo Cheng Wang ◽  
...  
Keyword(s):  
Grain Boundary ◽  
Electron Backscatter Diffraction ◽  
Texture Evolution ◽  
High Strength ◽  
Interstitial Free ◽  
If Steel ◽  
Boundary Character ◽  
Deep Drawability ◽  
Grain Boundary Character ◽  
High Strength If Steel

Interstitial-free (IF) steel has excellent deep-drawability and was used widely in automotive industry. High strength IF-steel is that some phosphorus was put in common IF-steel to improve its strength without destroying the deep-drawability [1]. Microstructure and grain boundary character strongly affect the deep-drawability of high strength IF-steel, it is an obligatory task to test those characters. The technique of Electron Backscatter Diffraction (EBSD) can reveal the microtexture and detailed orientation distribution of grains from a single EBSD map, as a powerful instrument, EBSD was used widely in materials research from last decade [2]. Many researches have been focused on the texture evolution and recrystallization phenomena of high strength IF-steels [3,4], but the microtexture and grain boundary characters of warm-rolled high strength IF-steels was not fully investigated. The present study was aimed at researching the microtexture characters of a commercial high strength IF-steels under different warm-rolled temperature using EBSD technique, the microstructure and grain boundary character were analyzed systemically, and the relationship between the microstructure and deep-drawability was discussed.

Microstructure and Texture Evolution Law of Ti-IF Steel for Extra Deep Drawing during Batch Annealing Process

2013 ◽  
Vol 873 ◽  
pp. 42-47
Author(s):  
Zheng Bing Meng ◽  
Lang He ◽  
Guang Liang Wu ◽  
Xin Bin Liu ◽  
Chao Yang Zhou
Keyword(s):  
Deep Drawing ◽  
Early Stage ◽  
Texture Evolution ◽  
Annealing Process ◽  
Recrystallization Temperature ◽  
Recrystallization Annealing ◽  
Recrystallization Process ◽  
If Steel ◽  
Hardness Tester ◽  
Batch Annealing

The variation of microstructure of Ti-IF steel of extra deep drawing grade, which having a 83%cold-rolled deformation under simulated batch annealing process at temperature ranging from 480°C to 750°C, was studied by using optical microscopy, X-ray diffraction (XRD) and metallographic micro-hardness tester. The evolution of texture during the recrystallization process was analyzed by Orientation Density Function (ODF). The results show that, the recrystallization temperature of experimental steel is 620-630°C, and the recrystallization process can be accomplished within 1h at660°C. Four major textures after cold rolling are observed as follows,{001}<110>, {111}<110>, {111}<112> and {112}<110>, respectively. At the early stage of recrystallization annealing, texture evolves from {111} toγ-{111}, which is quite beneficial to achieve high deep drawing performance,the texture {001}<110> and {112}<110> change marginally. as the annealing temperature rises up to 720°C, texture {001}<110> and {112}<110> change into fiber textureγ-{111}. After annealing,{111}<112> and {111}<110> textures become the two main types.

Influence of galvannealed process on coating corrosion resistance of high strength IF steel

2008 ◽  
Vol 59 (10) ◽  
pp. 825-830 ◽  
Author(s):  
Hao Xiaodong ◽  
Chen Binkai ◽  
Yu Wugang ◽  
Zhang Qifu
Keyword(s):  
Corrosion Resistance ◽  
High Strength ◽  
If Steel ◽  
High Strength If Steel

Effect of Cold Reduction Ratio and Annealing Temperature on Microstructure and Mechanical Property of 240MPa Grade High Strength if Steel

2011 ◽  
Vol 337 ◽  
pp. 23-28
Author(s):  
Min Li Wang ◽  
Li Xiao ◽  
Zhi Wang Zheng
Keyword(s):  
Annealing Temperature ◽  
High Strength ◽  
Reduction Ratio ◽  
Cold Reduction ◽  
Strain Hardening Exponent ◽  
If Steel ◽  
Coiling Temperature ◽  
Plastic Strain Ratio ◽  
Experimental Steel ◽  
High Strength If Steel

Hot rolled 240MPa grade high strength IF steel sheet was used to study the effect of cold reduction ratio and annealing temperature on the microstructures and mechanical properties of experimental steel. The experimental results showed that the recrystallization has finished under different annealing temperature followed 75% to 85% cold reduction ratio. To the experimental steel of high coiling temperature, The yield strength, tensile strength ,elongation percentage, yield point elongation, the plastic strain ratio and strain hardening exponent were approximate 260MPa, 445MPa, 37.5%, 2.14%, 0.25, 2.0. To the experimental steel of low coiling temperature, that were approximate 235MPa, 369MPa, 38.8%, 1.73%, 0.26, 2.1. Therefore, the suggested the optimal annealing temperature is 840 °C, cold reduction ratio is 75%, and it obtains optimally match of high strength and punching property.

Influence of Annealing Temperature on Properties and Texture of High Strength IF Steel

2011 ◽  
Vol 311-313 ◽  
pp. 940-943
Author(s):  
Kuan Hui Hu ◽  
Shun Bing Zhou ◽  
De Xin Tian ◽  
Guan Wen Feng
Keyword(s):  
Recrystallization Texture ◽  
Annealing Temperature ◽  
High Strength ◽  
Fiber Texture ◽  
Test Material ◽  
If Steel ◽  
Strength Change ◽  
Cold Rolled ◽  
R Value ◽  
High Strength If Steel

Using the cold rolled High Strength IF Steel sheet of 1.0 mm thickness as the test material,the r value and recrystallization texture were investigated by the tensile test and X Radial Diffraction Device.The results show that the test steel were annealed by heating to 760°C,800°C,840°C and holding sixty seconds,and with the increase of the annealing temperature ,the recrystallization finished and the texture to obtain the full evolution,and the r value of the steel grown.After the annealing,the recrystallization texture shows strong γ-fiber texture,homogeneous γ-fiber and weak α-fiber texture,and the texture strength change rule with the annealing temperature change was gained.

Research on the Microstructure and Properties of Coating on Galvannealed High Strength IF Steel

2014 ◽  
Vol 941-944 ◽  
pp. 1606-1611
Author(s):  
Chuan Wang ◽  
Hua Xiang Teng ◽  
Yong Lin Kang
Keyword(s):  
Corrosion Resistance ◽  
High Strength ◽  
Interstitial Free ◽  
If Steel ◽  
Main Constituent ◽  
Microstructure And Properties ◽  
Fe Content ◽  
Δ Phase ◽  
Coating Microstructure ◽  
High Strength If Steel

The microstructure, formability and corrosion resistance characters of industrially produced galvannealed coatings on high strength interstitial free (IF) steel with different galvannealing temperature have been investigated. With the galvannealing temperature increases, the Fe content of coating is increase, and the powdering resistance gets weaker while the corrosion resistance gets better. The coating microstructure consisting of a δ phase as the main constituent with a ζ layer on the top surface provides a good powdering resistance. The compact δ and Γ phases are good for the corrosion resistance of coating

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