Failure behaviors of 34Cr2Ni2Mo steel up to very high-cycle fatigue

IF 3.5 Q1 ENGINEERING, MULTIDISCIPLINARY
Shijian Wang, Qiyuan He, Quanwei Liang, J. Cui, Q. Jiang, Chang Liu, C. He, Lang Li, Yao Chen
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引用次数: 1

Abstract

PurposeThe study aims to examine the effect of inclusions and inherent microstructure on fatigue behavior of 34Cr2Ni2Mo steel.Design/methodology/approachFatigue behavior of 34Cr2Ni2Mo steel was investigated for up to 1E10 cycles.FindingsResults showed that both inclusion and inherent microstructure have an influence on the crack initiation mechanism. Fatigue cracks mostly initiated from inclusions, whereas substrate-induced crack initiations were also observed. Fatigue life of inclusion-induced failures is mostly determined by the location of inclusions rather than the loading stress. The inherent microstructure seems to tolerate inclusions at a lower stress level in very high-cycle regime owing to the absence of internal inclusion-induced failure. For the substrate-induced crack initiations, high-density dislocations are found to be accumulated around the carbide particle-matrix interface, which may be the cause of crack initiation in the inherent structure due to strain localization.Originality/valueThe effect of inclusions and inherent microstructure on fatigue behavior of 34Cr2Ni2Mo steel up to 1E10 cycles.HighlightsFatigue failure occurs even at a lifetime of 5.76E9 cycles.Surface inclusion induced premature failures.Inherent microstructure tolerates inclusions at lower stress level.Internal carbides promote substrate-induced crack initiations.
34Cr2Ni2Mo钢高周疲劳失效行为
目的研究夹杂物和固有组织对34Cr2Ni2Mo钢疲劳性能的影响。设计/方法/方法研究了34Cr2Ni2Mo钢在1E10次循环下的疲劳行为。结果表明,夹杂物和固有组织都对裂纹的起裂机制有影响。疲劳裂纹主要由夹杂物引起,但也有基体引起的裂纹。夹杂物诱发失效的疲劳寿命主要取决于夹杂物的位置而不是载荷应力。由于没有内部夹杂引起的破坏,在非常高的循环状态下,固有的微观结构似乎可以在较低的应力水平下容忍夹杂物。在基体诱导裂纹萌生过程中,碳化物颗粒-基体界面周围聚集了高密度的位错,这可能是由于应变局部化导致固有结构裂纹萌生的原因。研究了夹杂物和固有组织对34Cr2Ni2Mo钢1E10次循环疲劳性能的影响。即使寿命为5.76E9次,也会发生疲劳失效。表面夹杂物导致过早失效。固有的微观结构在较低的应力水平下可以容忍夹杂物。内部碳化物促进基体诱导裂纹萌生。
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来源期刊
International Journal of Structural Integrity
International Journal of Structural Integrity ENGINEERING, MULTIDISCIPLINARY-
CiteScore
5.40
自引率
14.80%
发文量
42
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