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本文研究了GCr15钢在水压机上以低的形变速率,一次性大形变量的亚温形变热处理对碳化物细化作用和强韧性的影响。测定了亚温形变碳化物预处理组织的A_h、K_(1c)及σ_(?)用SEM和TEM观察分析了断口形貌和组织精细结构,并与亚温锻热淬火和常规处理进行了比较。试验结果表明,亚温形变处理可获得超细化的球状碳化物,可显著缩短后续的球化退火处理时间。在水压机上亚温形变空冷即可获得理想的球化组织。亚温形变淬火组织基体由细小位错型板条M组成,板条内位错密度高,边界曲折,具有这种组织的钢的强韧性大幅度提高。
In this paper, the effects of sub-temperature deformation heat treatment of GCr15 steel on hydraulic press with low deformation rate and one-time large deformation were investigated. The A_h, K_ (1c) and σ_ (?) Of the pretreated microstructure of the sub-temperature deformation carbides were determined by SEM and TEM. The fracture morphology and fine structure of the microstructure were analyzed and compared with the sub-temperature forging quenching and conventional treatment . The experimental results show that sub-temperature deformation treatment can obtain ultrafine spherical carbides, can significantly shorten the subsequent ball annealing time. In the hydraulic press on the warm deformation of air-cooled to obtain the ideal ball organization. The sub-temperature deformation and quenching microstructure consists of fine dislocation-type laths M with high dislocation densities in the laths and tortuous boundaries. The strength and toughness of the steels with such structures are greatly enhanced.