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采用低碳Mn-Mo-Nb-Cr-Ni系的成分设计,轧后采用高密层流冷却装置,来研究轧后冷却速度及终冷温度对Q800E工程机械用钢板组织及性能的影响。研究表明,提高冷速或降低终冷温度都可以提高组织中板条贝氏体的比例,细化贝氏体板条,使强度显著提高;但当冷速过大时,弱化了针状铁素体对板条束的分割细化作用;终冷温度较高或冷速较低时,将有利于碳原子的扩散,使组织中M/A组元尺寸增大,部分呈尖角状,甚至在变形带上呈链状分布,严重损害低温冲击韧性。
The composition of low carbon Mn-Mo-Nb-Cr-Ni system was designed. The high-density laminar flow cooling device was used to study the influence of post-rolling cooling rate and finish temperature on the microstructure and properties of Q800E engineered steel. The results show that increasing the cooling rate or decreasing the final cooling temperature can increase the proportion of bainite in the microstructure and refine the bainite slab so as to improve the strength remarkably. However, when the cooling rate is too high, acicular iron The body of the slab beam segmentation refinement; higher cooling temperature or cooling rate is low, it will help the proliferation of carbon atoms, so that the organization M / A component size increases, some were sharp-pointed, Even in the deformation zone was chain-like distribution, serious damage to low temperature impact toughness.