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采用连铸—控轧—正火工艺试制了90 mm特厚钢板,研究了不同控制轧制和正火工艺对组织和力学性能的影响。结果表明:在奥氏体未再结晶区轧制时,减少道次数,单道次采用大压下率,有利于细化特厚钢板中心的晶粒,提高轧态厚板中心强度和韧性,而对珠光体的片层间距和体积分数影响不大;正火后,组织带状特征减轻,分布均匀,晶粒和珠光体团得到细化,使伸长率、低温冲击功及z向断面收缩率提高,能够得到抗拉强度为550 MPa级的低屈强比、高韧性和良好抗层状撕裂的特厚钢板。
The 90 mm thick steel plate was trial-produced by the continuous casting-controlled rolling-normalizing process. The effects of different controlled rolling and normalizing processes on the microstructure and mechanical properties were studied. The results show that when the austenite is not recrystallized, reducing the number of passes and adopting large reduction rate in one pass can promote the grain refinement of the center of the plate and improve the center strength and toughness of the slab. While the pearlite lamellar spacing and volume fraction of little effect; normalizing, the banding features reduce, uniform distribution, grain and pearlite group is refined, the elongation, low temperature impact energy and the z-section Shrinkage increased, can get a tensile strength of 550 MPa level low yield ratio, high toughness and good resistance to layer tearing of the thick steel plate.