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本文通过热处理、示波冲击、光镜、扫描电镜和透射电镜对３５ＳｉＭｎＭｏＶ钢的多相纤维状复合组织、马氏体加铁素体纤维状双相组织和以粒状贝氏体为主的夏合组织，进行了力学性能对比和冲击断口形貌、复合组织形态的观察；研究了不同复相组织的裂纹萌生功与扩展功；并测定了组织中的奥氏体体积分数。结果表明：前者在低温回火或未回火状态下，与调质态的纤维状双相组织和回火态的粒状贝氏体复会组织相比，在等强度下，具有更高的冲击能量和更优异的强韧性配合。多相复合组织具有高的裂纹萌生功。随冲击功提高，裂纹扩展功增加，萌生功与扩展功逐渐接近相等。
In this paper, heat treatment, oscillometric impact, light microscopy, scanning electron microscopy and transmission electron microscopy of 35SiMnMoV steel multiphase fibrous composite structure, martensite plus ferrite fibrous dual phase structure and granular bainite-based summer The mechanical properties, fracture morphology and composite microstructure were observed. The crack initiation and extension work of different complex phases were investigated. The volume fraction of austenite in the microstructure was also measured. The results show that the former has a higher impact at equal strength than the tempered fibrous bimetallic and tempered granular bainite in the tempering or non-tempering at low temperature Energy and more excellent toughness with. Multiphase composite structure has high crack initiation work. With the improvement of impact work, the crack extension work increases, and the work of initiation and extension work gradually become equal.