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采用形变强化铁素体相变超细晶轧制工艺,获得了750MPa级超细晶铁素体钢板,其超细晶铁素体体积比高达93%,晶粒尺寸仅为1μm,并具有优异的成形性能。对超细晶铁素体钢组织的精细分析发现,因铁素体晶界随晶粒超细化而减薄,使得其晶界对材料的力学性能具有双重影响,一方面,屈服强度随着晶界总长度的增加而提高;另一方面,又因晶界减薄而降低。研究表明,超细晶铁素体钢的组织性能关系虽然与霍尔-佩奇关系相吻合,但存在较大偏差,主要表现为斜率显著下降。文章对斜率下降的原因进行了机理分析。
A 750MPa ultrafine-grained ferritic steel plate was obtained by using a strain-enhanced ferrite transformation ultrafine-grained rolling process. The ultrafine-grained ferritic steel has a volume ratio of as high as 93% and a grain size of only 1 μm, which is excellent Forming properties. Fine analysis of the microstructure of the ultrafine-grained ferritic steel shows that the grain boundaries of the ferrite have a double influence on the mechanical properties of the material due to the grain refinement and thinning of the ferrite. On the one hand, the yield strength varies with The total length of the grain boundaries increases; on the other hand, the grain boundary decreases. The results show that although the relationship between the microstructure and properties of the ultrafine-grained ferritic steels is consistent with the Hall-Pecs relationship, there is a large deviation, which is mainly manifested as a significant decrease of the slope. The paper makes a mechanistic analysis of the reasons for the decline of slope.