Determination and analysis of SH-CCT curve of X80 pipeline steel with OD1422 mm

doi:10.13251/j.issn.0254-6051.2020.06.021

Abstract

Abstract: The Gleeble3500 thermo-mechanical simulation tester was used to simulate the thermal cycling process of the X80 pipeline steel with OD1422 mm at different cooling rates. The thermal expansion method was used to simulate the continuous cooling transformation curve of simulated heat affected zone (SH-CCT). Combined with microstructure analysis and hardness test, the microstructure change of welding heat affected zone (HAZ) of the X80 pipeline steel at different cooling rate conditions was studied. The test results show that the cooling rate has a significant effect on the phase transformation behavior of the steel. When the cooling rate is 1 ℃/s, the microstructure is transformed into bainite. When the cooling rate is 7 ℃/s, the martensitic transformation begins. When the cooling rate is 20 ℃/s, more lath bainite with higher dislocation density is obtained and the grain size is smaller. When the cooling rate is between 7 ℃/s and 20 ℃/s, the microhardness and impact property are greater than the base metal.

Key words: X80 pipeline steel, SH-CCT curve, heat affected zone(HAZ), microhardness, impact property

CLC Number:

TG115.2

Yu Chenyang, Chi Qiang, Zhang Weiwei, Hu Meijuan, Chen Qinglong, Ge Jialin. Determination and analysis of SH-CCT curve of X80 pipeline steel with OD1422 mm[J]. Heat Treatment of Metals, 2020, 45(6): 93-97.

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