Effect of titanium content on the microstructure and mechanical properties of 0.17C-0.30Si-1.40Mn steel

Liu Yangchun; Bai Fengxia; Xu Bin; Zhang Yunhe; Li Bei; Zhang Shilong

doi:10.7513/j.issn.1004-7638.2022.03.022

Volume 43 Issue 3

Jun. 2022

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Liu Yangchun, Bai Fengxia, Xu Bin, Zhang Yunhe, Li Bei, Zhang Shilong. Effect of titanium content on the microstructure and mechanical properties of 0.17C-0.30Si-1.40Mn steel[J]. IRON STEEL VANADIUM TITANIUM, 2022, 43(3): 139-145. doi: 10.7513/j.issn.1004-7638.2022.03.022

Citation:

Liu Yangchun, Bai Fengxia, Xu Bin, Zhang Yunhe, Li Bei, Zhang Shilong. Effect of titanium content on the microstructure and mechanical properties of 0.17C-0.30Si-1.40Mn steel[J]. IRON STEEL VANADIUM TITANIUM, 2022, 43(3): 139-145. doi: 10.7513/j.issn.1004-7638.2022.03.022

Citation:

Liu Yangchun, Bai Fengxia, Xu Bin, Zhang Yunhe, Li Bei, Zhang Shilong. Effect of titanium content on the microstructure and mechanical properties of 0.17C-0.30Si-1.40Mn steel[J]. IRON STEEL VANADIUM TITANIUM, 2022, 43(3): 139-145. doi: 10.7513/j.issn.1004-7638.2022.03.022

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Effect of titanium content on the microstructure and mechanical properties of 0.17C-0.30Si-1.40Mn steel

doi: 10.7513/j.issn.1004-7638.2022.03.022

1.
Research Institute of Technology of Shougang Group Co., Ltd., Beijing100434, China
2.
Shougang Group Beijing Shougang Co., Ltd., Qian^, an 064404, Hebei, China

Received Date: 2021-10-29
Publish Date: 2022-06-30

Abstract

Abstract

0.17C-0.30Si-1.40Mn steels with different titanium contents were prepared by smelting process. After hot rolling into hot-rolled coils, samples were taken for mechanical property test and metallographic structure inspection. Thin-film samples were made by the carbon replica extraction method for transmission electron microscope observation. The effect of titanium content on the microstructure and mechanical properties of 0.17C-0.30Si-1.40Mn steel was studied. The results show that the strength evolution corresponds to the Ti content (from 0 to 0.073%). The strength increases slowly when the Ti content is less than 0.020%, subsequently the strength increases significantly when the Ti content is 0.021%-0.038%, finally, the strength increases slowly again when the Ti content is more than 0.038%. The more titanium is added into 0.17C-0.30Si-1.40Mn steel, the more the elongation and impact energy decrease. Titanium has little effect on the microstructure of 0.17C-0.30Si-1.40Mn steel and can only slightly reduce its grain size. A small amount of Ti(N, C) and Ti₄C₂S₂particles of large size can be precipitated in 0.17C-0.30Si-1.40Mn steel, which weakly plays a fine-grain strengthening; however, a large number of fine TiC particles can be precipitated in the steel, resulting in strong precipitation strengthening effect. It is found that the influence of titanium content on the mechanical properties of low carbon manganese steel is also related to the carbon content in the steel. The two inflection points of the curve about strength transformation with titanium content also vary with different carbon content in the steel. Thereby restraining martensitic phase transformation.
- 0.17C-0.30Si-1.40Mn steel,
- microalloying,
- titanium content,
- microstructure,
- mechanical property,
- fine grain strengthening,
- precipitation strengthening

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References(14)

References

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