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本文研究了正火-形变-时效及调质-形变-时效对30CrMaSiA钢力学性能和组织结构的影响。结果表明,钢的硬度和强度随形变量增大而提高.而随后时效可引起钢进一步强化。例如,调质后冷轧形变52%并进行300℃时效的30CrMnSiA钢,其σ_(?)和σ_(0.2)分别达到150和140kgf/mm~2,δ(?)9%,与淬火并低温回火钢的力学性能相近,但调质后的成型性能却远远优于低温回火者。薄膜透射电子显微分析表明,这种形变时效强化效应与形变引起的亚结构细化和位错密度增加,以及时效时沿位错网络析出细小弥散的碳化物质点有关。
In this paper, the effects of normalizing-deformation-aging and tempering-deformation-aging on the mechanical properties and microstructure of 30CrMaSiA steel were studied. The results show that the hardness and strength of the steel increase with the increase of deformation, and subsequent aging can cause the steel to be further strengthened. For example, the σ_ (σ) and σ_ (0.2) of 30CrMnSiA steels, after being quenched and tempered at 52% and aged at 300 ℃, reached 150 and 140kgf / mm ~ 2, respectively, Tempering steel mechanical properties similar to, but the quenched and tempered molding performance is far superior to low temperature tempering. Thin-film transmission electron microscopy analysis shows that the deformation-aging-strengthening effect is related to the deformation of substructure and dislocation density caused by deformation, as well as the precipitation of finely dispersed carbide particles along the dislocation network during aging.