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研究认为在0.4%C-0.8%Si-1.65%Mn-0.12%V-0.02%Ti-0.012%Al s钢中,当V/N比从20.0降至10.0,V(CN)在最大形核率温度下的相对形核率提升约16个数量级,Ti(CN)提升约7个数量级,当V/N比进一步降至7.85和4.76,析出相形核率提升不显著,在相同超快冷工艺下,析出相尺寸可从60~100 nm细化至10~20 nm;该钢在F+P+B组织类型下,N加入量不宜超过140×10-6,在M+B组织类型下不宜超120×10-6,这主要是因为超快冷下过饱和的C、N原子在室温状态下扩散与M/B中高密度位错缠绕形成大量史氏气团强烈钉扎位错,从而导致材料塑性显著降低且推延自然时效时间。
It is considered that when the V / N ratio is reduced from 20.0 to 10.0 in 0.4% C-0.8% Si-1.65% Mn-0.12% V-0.02% Ti-0.012% Al s steel, V (CN) The relative nucleation rate increased by about 16 orders of magnitude with the increase of Ti (CN) by about seven orders of magnitude. When the V / N ratio was further reduced to 7.85 and 4.76, the nucleation rate of precipitates was not significantly increased. Under the same ultra-fast cooling process , The precipitated phase size can be refined from 60 ~ 100 nm to 10 ~ 20 nm. Under the F + P + B tissue type, the amount of N added should not exceed 140 × 10-6, which is not suitable under M + B tissue type 120 × 10-6. This is mainly due to the superfine and supersaturated C and N atoms diffused at room temperature and high density dislocations in M / B, forming a large number of strong pinning dislocations of the Schmid air mass, resulting in plasticity Significantly reduce and delay the natural aging time.