Effect of tempering temperature on the microstructure and low-temperature impact toughness of vanadium-contained X80 pipeline steel

ZHANG Yang; LI Longfei; WANG Chunhui

doi:10.7513/j.issn.1004-7638.2026.04.015

Volume 47 Issue 4

Aug. 2026

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ZHANG Yang, LI Longfei, WANG Chunhui. Effect of tempering temperature on the microstructure and low-temperature impact toughness of vanadium-contained X80 pipeline steel[J]. IRON STEEL VANADIUM TITANIUM, 2026, 47(4): 125-134. doi: 10.7513/j.issn.1004-7638.2026.04.015

Citation:

ZHANG Yang, LI Longfei, WANG Chunhui. Effect of tempering temperature on the microstructure and low-temperature impact toughness of vanadium-contained X80 pipeline steel[J]. IRON STEEL VANADIUM TITANIUM, 2026, 47(4): 125-134. doi: 10.7513/j.issn.1004-7638.2026.04.015

Citation:

ZHANG Yang, LI Longfei, WANG Chunhui. Effect of tempering temperature on the microstructure and low-temperature impact toughness of vanadium-contained X80 pipeline steel[J]. IRON STEEL VANADIUM TITANIUM, 2026, 47(4): 125-134. doi: 10.7513/j.issn.1004-7638.2026.04.015

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Effect of tempering temperature on the microstructure and low-temperature impact toughness of vanadium-contained X80 pipeline steel

doi: 10.7513/j.issn.1004-7638.2026.04.015

1.
The Chinese Society for Metals, Beijing 100081
2.
Department of Metallurgical Technology Research, Central Iron and Steel Research Institute, Beijing 100081
3.
School of Metallurgy and Ecology, University of Scienceand Technology Beijing, Beijing 100083

More Information

Received Date: 2026-03-06
Accepted Date: 2026-05-06
Rev Recd Date: 2026-04-27
Publish Date: 2026-08-31

Abstract

Abstract

In this paper, in order to clarify the influence of tempering temperature after thermo-mechanical control process on the low-temperature impact toughness of vanadium-contained X80 pipeline steel, the microstructural variation including nano-scale precipitates, microstructure, grain boundaries, and crystallographic characteristics, in experimental steels processed under six different tempering temperatures were investigated by multiple microstructural characterization methods. Furthermore, the relationship between the steel microstructures and low-temperature impact toughness was revealed. The results showed that with increasing tempering temperature from 450 ℃ to 650 ℃, the size and number of nano-scale precipitates in steel increased, while the size and quantity of granular acicular/lath ferrite and bainite decreased. Under these conditions, the low-temperature impact toughness was primarily dominated by the size and quantity of precipitates, exhibiting a gradually decreasing trend. Meanwhile, the number of polygonal ferrite increased and the ratio of high angle grain boundaries decreased. These microstructural changes led to a gradual decrease in low-temperature impact toughness. However, as the tempering temperature increased to 700 ℃, the ratio of fine precipitates in steel decreased and the average size increased. Moreover, the microstructure composed of coarse polygonal ferrite, with a significant increase in the ratio of high angle grain boundaries and Σ3 grain boundaries. Under tempering treatment at 700 ℃, the structural characteristics of grain boundaries were the main factors influencing low-temperature impact toughness. The impact energy of the steel tempered at 700 ℃ has been greatly improved, reaching up to 307.28 J.
- tempering temperature,
- X80 pipeline steel,
- vanadium,
- low temperature toughness

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References(35)

References

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