形变热处理对NHS15钢微观组织和高周疲劳性能的影响
发布时间：2019-04-25 22:14
【摘要】：研究了经形变热处理和常规热处理后NHS15高强度钢的微观组织结构和高周疲劳性能。结果表明,经形变热处理后,实验钢的屈服强度提高,试样的原奥氏体晶粒被细化,晶粒在轧制方向上被轻微拉长,且晶界被扭曲成锯齿状;形变热处理试样的马氏体束变细,回火后析出的碳化物更加细小、弥散;在107循环周次内,与常规热处理相比,形变热处理提高了试样的疲劳断裂抗力和疲劳寿命;常规热处理试样的疲劳断裂多起源于表面和内部基体,而形变热处理试样的断裂多源于内部夹杂物;疲劳断口裂纹源GBF处的应力场强度因子幅ΔK_(GBF)不随疲劳寿命N_f变化而变化。
[Abstract]:The microstructure and high cycle fatigue properties of NHS15 high strength steel after deformation heat treatment and conventional heat treatment were studied. The results show that after deformation heat treatment, the yield strength of the experimental steel increases, the original austenite grain size of the sample is refined, the grain size is slightly elongated in the rolling direction, and the grain boundaries are twisted into sawtooth shape. The martensite beam becomes finer and the carbides precipitated after tempering are finer and dispersed, and in 107 cycles, the fatigue fracture resistance and fatigue life of the specimen are improved compared with the conventional heat treatment. The fatigue fracture of conventional heat-treated specimens mainly originated from the surface and internal matrix, while the fracture of deformation-heat-treated specimens mostly originated from the internal inclusions. The amplitude of stress field intensity factor 螖 K _ (GBF) at the source GBF of fatigue fracture does not change with the change of fatigue life.
【作者单位】： 钢铁研究总院先进钢铁材料技术国家工程研究中心;中国金属学会;
【基金】：国家重点基础研究发展规划资助项目(2004CB619104)
【分类号】：TG161;TG142.1
[Abstract]:The microstructure and high cycle fatigue properties of NHS15 high strength steel after deformation heat treatment and conventional heat treatment were studied. The results show that after deformation heat treatment, the yield strength of the experimental steel increases, the original austenite grain size of the sample is refined, the grain size is slightly elongated in the rolling direction, and the grain boundaries are twisted into sawtooth shape. The martensite beam becomes finer and the carbides precipitated after tempering are finer and dispersed, and in 107 cycles, the fatigue fracture resistance and fatigue life of the specimen are improved compared with the conventional heat treatment. The fatigue fracture of conventional heat-treated specimens mainly originated from the surface and internal matrix, while the fracture of deformation-heat-treated specimens mostly originated from the internal inclusions. The amplitude of stress field intensity factor 螖 K _ (GBF) at the source GBF of fatigue fracture does not change with the change of fatigue life.
【作者单位】： 钢铁研究总院先进钢铁材料技术国家工程研究中心;中国金属学会;
【基金】：国家重点基础研究发展规划资助项目(2004CB619104)
【分类号】：TG161;TG142.1
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