A Basic Study on Fatigue Reliability of Spheroidal Graphite Iron with High Tension and Toughness. 3rd Report. On Estimating the Fatigue Limit of Hard Shot-Peening-Treated Austempered Ductile Iron in Sand Molding.

秀人, 鈴木; 淳, 曲田; 偉民, 襲; 吉保, 伊藤

doi:10.1299/kikaia.61.2349

Cited by 4 publications

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“…[3] It is also well known that surface residual stresses introduced by a variety of surface treatment methods such as shot peening, fillet rolling, induction hardening, laser treatment, and simply machining can affect the fatigue performance of various metallic materials. [16][17][18][19][20][21][22][23][24][25][26] However, the effects of residual stress induced by surface treatment on the LCF behavior of Ni-base superalloys have been studied only rarely at elevated temperatures. Chang et al [27] reported that at room temperature, the fatigue life of M17 superalloys is increased by higher compressive residual stresses induced by creep-feed grinding.…”

Section: Introductionmentioning

confidence: 99%

Effects of temperature and shot peening on S-N behavior of a PM Ni-base superalloy UDIMET 720

Luo

Bowen

2004

Metall Mater Trans A

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Fatigue S-N (stress vs life) curve behavior for a powder metallurgy (PM) Ni-base superalloy UDIMET 720 in both polished and shot-peened surface conditions was investigated at room temperature and 600°C in air. Tests were carried out under four-point bending at a load ratio of 0.1 and a frequency of 10 Hz. At 600°C, an offset S-N curve was found for both polished and shot-peened surface conditions. This offset S-N curve is deduced to be controlled by the location of crack nucleation sites. Observations and deductions of crack nucleation sites, crack nucleation life, crack closure, environmental attack, and cyclic softening and hardening have been used to explain the experimental results.

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Section: Introductionmentioning

confidence: 99%

Effects of temperature and shot peening on S-N behavior of a PM Ni-base superalloy UDIMET 720

Luo

Bowen

2004

Metall Mater Trans A

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“…The shot-peening treatment is one such method which has been studied by some researchers [1][2][3][4][5][6][7] with respect to the treatment of spring steels and gear steels. In recent years, the shot-peening treatments have been applied to aluminium alloys [7,8], titanium alloys [9,10] and ductile irons (DI) [11,12]. In addition, a study of shot-peening treatments for austenitic stainless steel which was taking notice for use as an atomic pile structure material has been reported [13][14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Fatigue Properties of Hard Shot-Peened Sus316l

Kobayashi

Ochi²,

Ishii³

1998

Journal of the Society of Materials Science, Japan

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The rotating bending fatigue properties of normal shot-peened (SP) and hard shot-peened (HSP) 316L austenitic stainless steels were investigated from the viewpoints of the changes of hardness distribution and compressive residual stress distribution during the high-cycle fatigue test. The investigation of the crack growth behavior was also carried out using a replication technique. It was found that the fatigue strength was improved by shot-peeving treatments, and the fatigue crack propagation mechanisms were clarified in the SP and HSP specimens. The fatigue crack growth behavior in the SP and HSP specimens was completely different from that of the non-peened specimens. The differences were caused by the change of the hardness distributions and the residual stress distributions during the fatigue test.

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Evaluation of the fatigue behavior of ductile irons with various matrix microstructures

Luo

Bowen

Harding

2002

Metall Mater Trans A

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The stress-failure (S-N) curves for ferritic irons, pearlitic irons, and austempered ductile irons (ADIs) have been determined under tension-tension loading with a stress ratio of 0.1. The effects of Ti contents of up to 0.10 wt pct (resulting from the deliberate use of Ti-containing steel scrap) on fatigue behavior were investigated. It was found that ferritic and pearlitic ductile irons can contain up to 0.10 wt pct Ti without any adverse effect on fatigue behavior. In ADIs, fatigue properties deteriorate at such high Ti contents. Tests were also conducted to investigate the effects of microstructural features on fatigue properties. It was found that the effect of the graphite nodule count (the number of graphite particles on a unit area of a polished surface) on the fatigue limit is significant only in ADIs. Scanning electron microscope (SEM) analysis has shown that cracks usually initiate from surface dross-type defects. However, in ADIs, fatigue cracks can also initiate at shrinkage cavities and at surface or subsurface locations. An offset bilinear S-N curve behavior (the linear S-N curve at higher stress levels is separated from the linear S-N curve at lower stress levels) has been observed in ADIs. This is attributed to surface residual compressive stresses, which prohibit fatigue crack initiation from surface positions at lower applied stress levels. In ferritic and pearlitic ductile irons, the offset bilinear S-N curve behavior is not observed because of the rapid relaxation of the residual compressive stresses.

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A Basic Study on Fatigue Reliability of Spheroidal Graphite Iron with High Tension and Toughness. 3rd Report. On Estimating the Fatigue Limit of Hard Shot-Peening-Treated Austempered Ductile Iron in Sand Molding.

Cited by 4 publications

References 0 publications

Effects of temperature and shot peening on S-N behavior of a PM Ni-base superalloy UDIMET 720

Effects of temperature and shot peening on S-N behavior of a PM Ni-base superalloy UDIMET 720

Fatigue Properties of Hard Shot-Peened Sus316l

Evaluation of the fatigue behavior of ductile irons with various matrix microstructures

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