多向强应变及退火处理对中碳低合金钢组织和性能的影响

Effect of Multi-directional Strong Strain and Annealing Treatment on Microstructure and Properties of Medium Carbon Low Alloy Steel

采用强塑性变形技术制备的超细晶材料,尽管强度和硬度很高,但塑性很差。对中碳低合金钢进行了亚温淬火+多向锻造,然后进行了退火处理。结果表明:多向锻造后在400℃保温2 h退火试样的抗拉强度、伸长率分别为965.7 MPa、10.4%;试样组织为双峰的铁素体晶粒耦合弥散分布的碳化物,从而使得材料获得了优异的综合力学性能。

Ultrafme grain materials were prepared by the strong plastic deformation technology. Although its strength andhardness were very high, but the plasticity was very poor. The medium carbon low alloy steel was subjected to intercriticalhardening＋multi-directional forging and then annealing treatment. The results show that the tensile strength and elongation ofthe samples are 965.7 MPa and 10.4%, respectively, after multi-directional forging and then annealing at 400 ℃ for 2 h.Microstructure of the sample is the bimodal ferrite grains coupled carbides of dispersion distribution, so the materials haveexcellent comprehensive mechanical properties.