Subsurface crack initiation and propagation mechanism in high-strength steel in a very high cycle fatigue regime

Shiozawa, Kazuaki; Morii, Yuuichi; Nishino, Seiichi; Lu, Liantao

doi:10.1016/j.ijfatigue.2005.08.015

Cited by 373 publications

(314 citation statements)

References 16 publications

Supporting

Mentioning

283

Contrasting

Unclassified

Order By: Relevance

“…A couple of statements have been made regarding the FGA formation: (1) FGA is accompanied by VHCF crack initiation from interior inclusion for high carbon steels [29], (2) FGA consumes more than 90 percent of VHCF life [12,14,17], and (3) FGA is finished when the plastic zone size of the microcrack exceeds the width of the martensite [21]. Here, we further assume that dislocations are piled up along the slip band in the martensite as described by the Tanaka-Mura model [30,31], and take into account the influence of tensile strength and FGA size on VHCF crack initiation life.…”

Section: Dominant Variable Sensitivity Analysismentioning

confidence: 99%

“…Studies on VHCF mechanism have shown that it is the microstructure that plays an important role in the process of interior fatigue crack initiation with FGA morphology. The predominant features of microstructure include spherical carbide [17], hydrogen [18], inclusion size [19], and chemical compositions of inclusion [20]. It is also reported that, the threshold value of VHCF crack initiation ΔK FGA is approximately equal to the threshold value of crack propagation ΔK th regardless of the microstructures [21].…”

Section: Introductionmentioning

confidence: 96%

See 1 more Smart Citation

Effects of loading condition on very-high-cycle fatigue behaviour and dominant variable analysis

Lei

Xie

Sun

et al. 2013

Sci. China Phys. Mech. Astron.

View full text Add to dashboard Cite

The specimens of a high carbon chromium steel were quenched and tempered at 150°C, 180°C and 300°C. Such specimens were tested via rotating bending and a push-pull type of axial loading to investigate the influences of loading condition on the behaviour of very-high-cycle fatigue (VHCF). Experimental results show the different influences of inclusion size on the fatigue life for the two loading conditions. Predominant factors and mechanism for the fine-granular-area (FGA) of crack origin were discussed. In addition, a reliability analysis based on a modified Tanaka-Mura model was carried out to evaluate the sensitivity of inclusion size, stress, and K FGA to the life of VHCF crack initiation.

show abstract

Section: Dominant Variable Sensitivity Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 96%

Effects of loading condition on very-high-cycle fatigue behaviour and dominant variable analysis

Lei

Xie

Sun

et al. 2013

Sci. China Phys. Mech. Astron.

View full text Add to dashboard Cite

show abstract

“…Around the inclusion, a characteristic rough region with fine granular area is presented, and this rough region is always surrounded by a flat region thus to form a whole ''fisheye'' morphology [6][7][8]. Due to the related observation approach, this rough area is named as optically dark area (ODA [9]), granular bright facet (GBF [10]), or fine granular area (FGA [11]) in literature. In this paper, the name of FGA is used for this rough region.…”

Section: Introductionmentioning

confidence: 99%

Effects of inclusion size and location on very-high-cycle fatigue behavior for high strength steels

Lei

Hong

Xie

et al. 2012

Materials Science and Engineering: A

View full text Add to dashboard Cite

a b s t r a c tFatigue tests with rotary bending (52.5 Hz) and ultrasonic cycling (20 kHz) methods were performed, respectively on two high strength steels so as to investigate the effects of inclusion size and location on the fatigue behavior from low cycle fatigue to very-high-cycle fatigue (VHCF) regimes. Under rotary bending test, four fracture patterns were observed with respect to different locations of inclusion on fracture surface. The mean crack growth rate within FGA (fine granular area of crack origin) was estimated to give the value with the magnitude of 10 -13 m/cycle for the specimens with the fracture pattern of ''FGA þ surface fisheye''. Under ultrasonic cycling test, the size effect of inclusions on VHCF was investigated with two groups of specimens. One is with the inclusion size between 20 and 60 mm and the other is with the inclusion size between 10 and 30 mm. The results show that large inclusions lowered the proportion of net FGA at given stress levels and led to the shortening of VHCF life. The degradation of VHCF strength caused by the increase of inclusion size is ascribed to the decrease of the critical stress of FGA formation for large inclusions.

show abstract

“…(1)~ (23) となる．なかでも，超高サイクル域で内部き裂の起点となった介在物周囲には凹凸の大きい特異な領域が観察され，著者らの一人は GBF（Granular-Bright -Facet）と命名し，「微細炭化物の離散剥離説」を提案してきた (24), (25) ．疲労破壊形態は応力振幅・疲労寿命によって，表面介在物をき裂発生起点とする表面き裂発生型破壊（S 型破壊），GBF 領域を形成しない内部介在物をき…”

Section: 緒言高強度鋼や表面改質鋼の室温・大気中における回転曲げ疲労試験によって得られる S-n 曲線は，高応力振幅・短寿命unclassified

Effect of Loading Mode on Very High Cycle Fatigue Properties of High Speed Steel

Shimatani¹,

Shiozawa²,

Li³

et al. 2012

Trans.JSME, Ser.A

View full text Add to dashboard Cite

In order to study the effect of loading mode on fatigue properties of high speed steel (0.7C-4Cr-0.1W-3 Mo-2V) in very high cycle regime, fatigue tests under axial loading and rotating bending condition were performed in laboratory air using the hourglass shaped specimen. From the experiment results, clear duplex S-N curve appeared in both loading conditions, that is, there were two curves composed of a surface failure mode and a subsurface failure mode. Fatigue life under axial loading condition was shorter than that under the rotating bending condition, especially in low stress amplitude level. The difference in fatigue lifetime and transition of failure mode between the loading modes was discussed from the viewpoint of inclusion size, applied stress distribution across the specimen section and residual stress in surface layer.

show abstract

Subsurface crack initiation and propagation mechanism in high-strength steel in a very high cycle fatigue regime

Cited by 373 publications

References 16 publications

Effects of loading condition on very-high-cycle fatigue behaviour and dominant variable analysis

Effects of loading condition on very-high-cycle fatigue behaviour and dominant variable analysis

Effects of inclusion size and location on very-high-cycle fatigue behavior for high strength steels

Effect of Loading Mode on Very High Cycle Fatigue Properties of High Speed Steel

Contact Info

Product

Resources

About