Effects of Finish Cooling Temperature on Microstructure and Properties of X100 Pipeline Steels

Abstract:

The effect of finish cooling temperature on microstructure and mechanical properties of X100 pipeline steels were investigated through SEM, TEM and mechanical tests. The results showed that the effect of finish cooling temperature on tensile strength of studied steels were slight in the temperature range of 180°C~500°C. The yield ratio, yield strength and impact toughness all presented peak value when the finish cooling temperature was 360°C, however, both the volume fraction and particle size of MA component at 360°C finish cooling temperature had the minimum values. As a brittle hardening phase in bainite the increased number and enlarged size of the MA component were the key factor of the decrease of the yield ratio and toughness. Therefore, rational choosing finish cooling temperature could optimize the morphology and distribution of MA component to make sure the required strength and toughness for the X100 pipeline steel production.

• Periodical: Materials Science Forum (Volume 850)
• Pages: 993-999
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.850.993
• Online since: March 2016
• Authors: Shu Jun Jia*, Qing You Liu, Ba Li, Hong Mei Hao
• Keywords: Finish Cooling Temperature, Impact Toughness, Ma Component, X100 Pipeline Steel, Yield Ratio

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