控轧控冷工艺参数对海上风电用S460钢组织性能影响

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Abstract：Toaddress the demand for high strengthand toughness of S46O steel incomplex marine environments，the effects of non-recrystallization zone rolling temperature， passreduction rate，and holding thickness on microstructure and mechanical properties were investigated through ultra-purified smelting combined with thermo-mechanical controlled processing. The results indicated that reducing the rolling temperature in the non-recrystallization zone to 812℃was found to promote grain refinement and dislocation strengthening， with the yield strength being elevated to 610.47MPa . At the same time，more quasi-polygonal ferrite was formed， improving both plasticity and toughness.When the pass reduction rate was raised to 26.0% ，theamount of bainite and nano-sized particle precipitation increased，but the impact energy at dropped to 142J， The optimal balance between strength and low-temperature toughnesswasachievedataholdingthicknessof 40mm .Thisstudydemonstratesthatthestrengthtoughness synergy in S46O steel can be controlled by tailoring grain refinement，dislocation density，and precipitate distribution via TMCP，providing arobust processdesign basis for eficient manufacturing of offshore wind power structural steels.

Keywords： thermo-mechanical control process； S460 steel for ofshore wind power；low-temperature toughness； microstructure and mechanical properties

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随着全球能源结构向清洁化、低碳化转型，海上风电作为可再生能源的重要组成部分，近年来发展迅猛。（剩余7332字）