Effect of Shot Peening on Fatigue Strength of 18%Ni Maraging Steel

Moriyama, Michihiko; Nagano, Takanori; Kawagoishi, Norio; Takaki, Setsuo; Nagashima, Etsuichi

doi:10.1299/jsmea.44.301

Cited by 19 publications

(12 citation statements)

References 5 publications

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“…Change of fatigue crack initiation from the surface to interior inclusions is well in accordance with the behaviour of other high strength steels when lifetime increases to the VHCF regime. [3][4][5][6][7] Moriyama et al 8 studied the influence of shot peening in rotating bending tests with 18Ni maraging steel. The residual compression surface stresses improved cyclic properties in the entire investigated regime of fatigue lifetimes between 10 4 and 10 8 cycles.…”

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confidence: 99%

“…Fracture surfaces of specimens that failed in the very high cycle regime: (a) crack initiation at a TiN inclusion in material A, Δσ/ 2 = 375 MPa, 5.6 × 108 cycles to failure; (b) crack initiation at an Al 2 O 3 inclusion in material B, Δσ/2 = 500 MPa, 4.4 × 10 8 cycles to failure. an inclusion, its chemical composition is analysed with Energy Dispersive X-ray analysis.…”

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confidence: 99%

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VHCF properties of nitrided 18Ni maraging steel thin sheets with different Co and Ti content

Schuller¹,

Fitzka²,

Irrasch³

et al. 2014

Fatigue Fract Eng Mat Struct

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High cycle fatigue (HCF) and very high cycle fatigue (VHCF) properties of two 18Ni maraging steels with different cobalt and titanium content and similar static strength are investigated. Ultrasonic fatigue tests are performed with thin sheets with nitrided surfaces at load ratio R = 0.1. The specimens are mounted on a carrier and are forced to joint vibrations at approximately 20 kHz. The increase of Co content and the elimination of Ti improved the HCF and VHCF strength of 18Ni maraging steel. TiN inclusions if Ti is present and Al2O3 inclusions in the Ti free material with sizes (areaINC)1/2 smaller than 10 µm were preferential crack initiation locations. Considering inclusions as initial cracks, the minimum stress intensity range for VHCF failure is 1.2 MPam1/2 for TiN inclusions and 1.8 MPam1/2 for Al2O3 inclusions. Data scatter may be slightly reduced if lifetimes are presented versus stress amplitudes multiplied by (areaINC)1/12 rather than in an S–N diagram.

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confidence: 99%

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confidence: 99%

VHCF properties of nitrided 18Ni maraging steel thin sheets with different Co and Ti content

Schuller¹,

Fitzka²,

Irrasch³

et al. 2014

Fatigue Fract Eng Mat Struct

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“…The relatively low cyclic strength in relation to the very high static strength was attributed to cyclic softening and growth of precipitates during cyclic deformation. Moriyama et al [3] and Kawagoishi et al [4] studied the influence of shot peening on the fatigue strength of 18Ni maraging steel. Rotating bending fatigue tests showed that the S-N curve measured with shotpeened specimens was shifted towards higher stress amplitudes compared with the untreated material due to the beneficial influence of surface compression stresses.…”

Section: Introductionmentioning

confidence: 99%

“…Rotating bending fatigue tests showed that the S-N curve measured with shotpeened specimens was shifted towards higher stress amplitudes compared with the untreated material due to the beneficial influence of surface compression stresses. Surface crack initiation in the HCF regime and interior crack initiation at inclusions in the VHCF regime was observed for the shot-peened material [3,4]. Nitriding is an effective method to increase the wear resistance and can also have beneficial influences on the fatigue strength.…”

Section: Introductionmentioning

confidence: 99%

Influence of inclusion type on the very high cycle fatigue properties of 18Ni maraging steel

Karr¹,

Schuller²,

Fitzka³

et al. 2017

J Mater Sci

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The very high cycle fatigue (VHCF) properties of four 18Ni maraging steels were investigated. Ultrasonic fatigue tests were performed on thin sheets with nitrided surfaces at load ratio R = 0.1. Traditional maraging steel containing Ti (material A) showed crack initiation at TiN-inclusions. The elimination of Ti and the increase in Co content (material B) lead to preferential crack initiation at aluminate-inclusions. Aluminate-inclusions are less damaging than TiN-inclusions, and material B shows higher VHCF strength than material A. A further developed maraging steel (material C) with reduced Co content that is compensated for by alloying with Al showed crack initiation at aluminate-as well as at Zr(N,C)-inclusions. Zr(N,C)-inclusions are more damaging than aluminateinclusions and less damaging than TiN-inclusions. The highest VHCF strength was found for a recently developed alloy with further increased Al content (material D). In addition to inclusion-initiated fracture, this material showed shear mode crack initiation in the nitrided zone at the surface.

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“…In the literature, most of the work done till date on the effect of shot peening on fatigue does not consider the effect of internal damping at various depths of deformed layer and shot peening conditions [11][12][13]. The induction of compressive residual stress and increased hardness helps in improving the damping factor of the specimen at various shot peening conditions.…”

Section: Introductionmentioning

confidence: 99%

Relationship between Damping Factor and Compressive Residual Stress for Shot-Peened Austenitic Stainless Steel

Singh

Khan

Aggarwal

2011

ISRN Mechanical Engineering

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The mechanical properties of austenitic stainless steel are rarely improved by heat treatment. Shot peening is a well-known cold working process that affects thin surface of materials. By controlling the shot peening intensity and shot size, the variable mechanical properties film thickness was obtained from 0.05 mm to 0.5 mm. The damping factor and compressive residual stress are determined experimentally and forming a relation between them. It was found that damping factor in thin film surface increases with depth of deformed layer. An investigation was carried out, and it was found that the increase in damping factor was due to introduction of compressive residual stress and increased hardness due to shot peening. The paper discusses a model of changing damping properties with compressive residual stress and depth of deformed layer of austenitic stainless steel.

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Effect of Shot Peening on Fatigue Strength of 18%Ni Maraging Steel

Cited by 19 publications

References 5 publications

VHCF properties of nitrided 18Ni maraging steel thin sheets with different Co and Ti content

VHCF properties of nitrided 18Ni maraging steel thin sheets with different Co and Ti content

Influence of inclusion type on the very high cycle fatigue properties of 18Ni maraging steel

Relationship between Damping Factor and Compressive Residual Stress for Shot-Peened Austenitic Stainless Steel

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