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在Gleeble-3800热模拟试验机上进行热变形试验,研究Nb-V复合非调质钢在不同锻造工艺下的组织变化规律。结果表明,相对于单独添加V的非调质钢,Nb-V复合非调质钢锻后晶粒细小,铁素体含量增多,呈块状均匀分布,珠光体片层间距减小,且片层分布不规则,可改善钢的组织韧性。降低冷却速度有利于先共析铁素体长大,促使网状铁素体向块状铁素体转变,分布更均匀,有利于非调质钢韧性的改善。增大锻后变形量,可使组织细化。
Hot deformation tests were carried out on a Gleeble-3800 thermal simulator to study the microstructure change of Nb-V non-quenched and tempered steel under different forging processes. The results show that compared with the non-quenched and tempered steel with V added alone, the Nb-V composite non-quenched and tempered steel has fine grain size, increased ferrite content, uniform distribution of block shape, reduced spacing of pearlite sheets, Layer irregular distribution, can improve the toughness of the steel tissue. Reducing the cooling rate is conducive to proeutectoid ferrite growth, prompting the mesh ferrite to massive ferrite transformation, more evenly distributed, is conducive to the non-quenched and tempered steel toughness improvement. Increasing the amount of deformation after forging, can refine the organization.