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研究了表层超快冷工艺下(SUFC)830 MPa级高强精轧螺纹钢筋碳氮化物析出形态、强化方式以及组织特征。结果表明,高强精轧螺纹钢筋析出相有方形、球形和片状三种形态,析出相结构基本相同,均为(TixV1-x)(CN)。钢筋芯部析出物较多,细小、弥散,呈片状或细片状,尺寸50 nm左右;边部析出物相对较少,呈方形或球形,尺寸100 nm左右。该钢具有典型组织特征:边部回火索氏体,芯部铁素体+珠光体,在组织强化的基础上通过弥散析出、相间析出和铁素体基体中位错线上析出等析出强化方式,弥补了芯部软相和边部过冷强化相之间的强度差异,保证了轧材的性能稳定。
The carbonitride precipitation morphology, strengthening mode and microstructure characteristics of 830 MPa high-strength finishing rolled rebar under surface ultra-cold process (SUFC) were studied. The results show that the morphology of the precipitated phase of high strength finishing rolled rebar is square, spherical and flaky, and the precipitated phases are basically the same (TixV1-x) (CN). There are many precipitates in the core of steel bar, which are small, diffuse, flake or flake, and the size is about 50 nm. There are relatively few precipitates on the edge, which are square or spherical with the size of about 100 nm. The steel has the typical organizational features: tempered sorbite edge, core ferrite + pearlite, based on the strengthening of the organization through the precipitation, precipitation and precipitation of ferrite matrix dislocation line precipitation precipitation strengthening Way to make up for the difference between the strength of the core soft phase and the edge of the supercooled strengthening phase to ensure the stability of the rolled material.