The Local Texture Analysis of Structural Inhomogeneities in Low-Carbon High-Strength Steel after Direct Quenching

Thermomechanical controlled processing is a very important way to control the microstructure and mechanical properties in low carbon, high strength steel. This is especially true in the case of bainite formation, where the complexity of the austenite-bainite transformation makes the control of the processing important. In this study, a low carbon, high manganese steel containing niobium was investigated to better understand the roles of austenite conditioning and cooling rates on the bainitic phase transformation. Specimens were compared with and without deformation, and followed by seven different cooling rates ranging between 0.5°C/s and 40°C/s. The CCT curves showed that the transformation behaviors and temperatures are very different. The different bainitic microstructures which varied with austenite deformation and cooling rates will be discussed.

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Anisotropic mechanical properties and deformation behavior of low-carbon high-strength steel component fabricated by wire and arc additive manufacturing

Materials Science and Engineering A ◽

10.1016/j.msea.2020.139514 ◽

2020 ◽

Vol 787 ◽

pp. 139514

Author(s):

Laibo Sun ◽

Fengchun Jiang ◽

Ruisheng Huang ◽

Ding Yuan ◽

Chunhuan Guo ◽

...

Keyword(s):

Mechanical Properties ◽

Additive Manufacturing ◽

High Strength Steel ◽

Deformation Behavior ◽

High Strength ◽

Low Carbon ◽

Steel Component ◽

Anisotropic Mechanical Properties

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Investigation on the Elongation of Tailor Welded Blanks with Different Thickness

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.189-193.2888 ◽

2011 ◽

Vol 189-193 ◽

pp. 2888-2891

Author(s):

Hao Bin Tian ◽

Zhen Lei Li ◽

Xiao Feng Deng ◽

Xian Ping Liu

Keyword(s):

Tensile Test ◽

High Strength Steel ◽

High Strength ◽

Low Carbon ◽

Tailor Welded Blanks ◽

Light Weighting ◽

Different Thickness

Tailor welded blanks (TWBs) get popular used in the automobile for the light-weighting, and the assessments for TWBs formability are more and more important owing to the TWBs with different thicknesses. In this paper, based on the tensile test and low carbon high strength steel (ZStE220P), the influences of seam location and the length of sample on the elongation are studied, and the results shows that the location of seam has greater effect on the formability of TWBs and elongation is getting decreased with the seam shifting to the thinner part.

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On the Microstructure of Plate Steels for API-5L X120 Applications

Materials Science Forum ◽

10.4028/www.scientific.net/msf.706-709.17 ◽

2012 ◽

Vol 706-709 ◽

pp. 17-23 ◽

Cited By ~ 1

Author(s):

C. Isaac Garcia ◽

Ming Jian Hua ◽

X. Liang ◽

P. Suikannen ◽

Anthony J. DeArdo

Keyword(s):

Hsla Steel ◽

High Strength ◽

Steel Plates ◽

Low Carbon ◽

Austenite Grain Size ◽

Direct Quenching ◽

Prior Austenite Grain Size ◽

Optical Examination ◽

Very High

The very high strength now achievable in low carbon HSLA steel plates is caused by the formation of bainite or martensite during the post-hot rolling cooling in interrupted direct quenching. Modern electron optical examination, especially FEG-SEM, has allowed the microstructural features such as packet, block and lath dimensions and crystallography to be quantitatively determined. Several recent studies have attempted to relate the strength and toughness to these features, with limited success. However, one observation is clear, these microstructural features scale with the prior-austenite grain size and state of recrystallization. The role of microalloying, beyond grain refinement, remains inconclusive. This paper will discuss these microstructures and suggest possible ways of further refining them.

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