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采用热处理方法在35SiMnMoV钢中,获得了马氏体+贝氏体+铁素体+奥氏体的多相纤维状复合组织。并与马氏体+铁素体纤维状双相组织和粒状贝氏体为主的复合组织作了冲击性能、硬度、强度对比。对冲击断口形貌,复合组织形态和奥氏体体积分数作了分析。结果表明,前者在低温回火或未回火状态下与调质的纤维状双相组织和回火态的粒状贝氏体组织相比,在同硬度、同强度下具有更高的冲击韧性和更优异的强韧性配合。并探讨了冲击性能变化的机理。
The multi-phase fibrous composite structure of martensite + bainite + ferrite + austenite was obtained by heat treatment in 35SiMnMoV steel. And with martensite + ferrite fibrous two-phase structure and granular bainite-based composite structure made of impact performance, hardness, strength contrast. The fracture morphology, composite microstructure and austenite volume fraction were analyzed. The results show that the former has higher impact toughness and same strength under the same tempering and non-tempering conditions compared with the tempered fibrous dual-phase structure and the tempered granular bainite structure and More excellent toughness with. The mechanism of impact property change was also discussed.