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用Gleeble热模拟试验机研究了0.06C-0.31MoV-Nb-Ti-B微合金化钢再结晶区压下率(35·0%~52·0%)、非再结晶区压下率(60·2%~70·3%)、冷却速度(20~38℃/s)等轧制参数对钢的组织和机械性能的影响。试验结果表明,随着轧后冷却速度加大,上贝氏体的体积比增加导致钢强度的提高;贝氏体基体中针状铁素体含量越多,上平台能(USE)越大,韧-脆转变温度越低,因此,贝氏体基体中针状铁素体能改善管线钢的机械性能。
The reduction rate of recrystallization region (35.0% -52.0%) in 0.06C-0.31MoV-Nb-Ti-B microalloyed steel was studied by Gleeble thermal simulation machine. The reduction ratio of non-recrystallization region · 2% ~ 70 · 3%), cooling rate (20 ~ 38 ℃ / s) and other rolling parameters on the microstructure and mechanical properties of steel. The results show that with the increase of the cooling rate after rolling, the increase of the volume fraction of upper bainite leads to the increase of the strength of the steel. The more the content of acicular ferrite in the bainite matrix, the larger the upper plateau energy (USE) Tough - brittle transition temperature is lower, therefore, bainitic matrix acicular ferrite can improve the mechanical properties of pipeline steel.