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采用高Ti成分设计,通过高温轧制方法制备了3种含硼和不含硼7 mm厚的高强度贝氏体钢板,对钢中合金元素的作用以及加热、轧制工艺对钢板性能的影响进行了研究。结果表明,含硼钢板经600℃回火后,屈服强度达920 MPa,伸长率14.0%;回火后的含硼和不含硼钢板在-60℃～-20℃条件下5 mm厚试样的冲击韧度值均大于50 J,冲击断口具有韧窝形貌,并有大量平行于轧制方向的分层。含硼钢板具有细小板条贝氏体组织,原奥氏体晶粒宽度在10μm左右,内部贝氏体板条宽度150～300 nm。这种细小的贝氏体组织以及冲击试验中出现的断口分层现象,使钢板在达到极高屈服强度的同时,仍具有极佳的低温韧性。
Using high-Ti component design, three kinds of high-strength bainitic steel with boron and boron-free 7 mm thickness were prepared by high-temperature rolling process, the effect of alloying elements in the steel and the effect of heating and rolling process on the properties of the steel Were studied. The results show that the yield strength of the boron-containing steel plate after tempering at 600 ℃ is 920 MPa and the elongation rate is 14.0%. After tempering, the boron-containing and boron-free steel plate is tested under the condition of -60 ℃ ~ -20 ℃ The impact toughness values were greater than 50 J, impact fracture with dimple morphology, and a large number of parallel to the rolling direction of the stratification. Boron-containing steel sheet with small lath bainite, the original austenite grain width of about 10μm, the internal bainite lath width of 150 ~ 300nm. This small bainite structure and the fracture in the impact test stratification phenomenon, so that the plate reaches a high yield strength at the same time, still has excellent low temperature toughness.