形變熱處理對NHS15鋼微觀組織和高周疲勞性能的影響
發(fā)布時間:2019-04-25 22:14
【摘要】:研究了經形變熱處理和常規(guī)熱處理后NHS15高強度鋼的微觀組織結構和高周疲勞性能。結果表明,經形變熱處理后,實驗鋼的屈服強度提高,試樣的原奧氏體晶粒被細化,晶粒在軋制方向上被輕微拉長,且晶界被扭曲成鋸齒狀;形變熱處理試樣的馬氏體束變細,回火后析出的碳化物更加細小、彌散;在107循環(huán)周次內,與常規(guī)熱處理相比,形變熱處理提高了試樣的疲勞斷裂抗力和疲勞壽命;常規(guī)熱處理試樣的疲勞斷裂多起源于表面和內部基體,而形變熱處理試樣的斷裂多源于內部夾雜物;疲勞斷口裂紋源GBF處的應力場強度因子幅ΔK_(GBF)不隨疲勞壽命N_f變化而變化。
[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.
【作者單位】: 鋼鐵研究總院先進鋼鐵材料技術國家工程研究中心;中國金屬學會;
【基金】:國家重點基礎研究發(fā)展規(guī)劃資助項目(2004CB619104)
【分類號】: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.
【作者單位】: 鋼鐵研究總院先進鋼鐵材料技術國家工程研究中心;中國金屬學會;
【基金】:國家重點基礎研究發(fā)展規(guī)劃資助項目(2004CB619104)
【分類號】:TG161;TG142.1
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