Growth of small fatigue cracks in PH 13-8 Mo stainless steel

Patel, Ajay M.; Neu, Richard W.; Pape, J.A.

doi:10.1007/s11661-999-0278-3

Cited by 8 publications

(3 citation statements)

References 8 publications

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“…The selected points contain different percentages of C, Cr, Ni, Mn, Fe and Al elements. The existence of these elements demonstrates a small amount of NiAl, CrC, MoC, Fe 3 C and NiMn precipitates, which affect the strength of steels [13,[24][25][26]. The precipitations in the martensite structure hinders the dislocation motion that enhances the strength of steel [27,28].…”

Section: A Workpiece Materialsmentioning

confidence: 99%

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Aging Effect on Microstructure and Machinability of Corrax Steel

GÜLDİBİ

Demir

2020

Eng. Technol. Appl. Sci. Res.

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In this paper, the influence of the aging process on the microstructure and machinability of Corrax Steel was investigated for four samples: a solution heat-treated (A0) and three samples aged at 400ºC (A4), 525ºC (A5.25) and 600ºC (A6) for four hours. The effect of aging temperature on hardness was examined. Machining tests were carried out using a CNC lathe with a multi-layer coated PVD (AlTiN) cutting tool, at various cutting speeds (50, 100, 150, 200, 250, 300, 350m/min) with constant feed rate (0.1mm/rev) and 1mm constant cutting depth. The microstructure was investigated using an optical microscope and EDS attached SEM. The effect of aging on reverted austenite formation was also evaluated. In order to understand the changes in surface topology, cutting forces and vibrations were measured. With increasing aging temperature, the lath martensite was transformed to plate martensite because of the formation of precipitates and reverted austenite. Aging at different temperatures increased hardness up to 58%, cutting forces up to 117% and surface roughness up to 450%. The results describe the effect of the aging treatment on cutting forces, surface topology, tool wear and vibrations.

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Section: A Workpiece Materialsmentioning

confidence: 99%

“…There are several researches about the aging treatment, strength, hardness, fracture toughness, strength in high temperature, reverted austenite formation, and hydrogen embrittlement of maraging steels [13][14][15][16]. However, there is a lack of extensive study on the machining of Corrax steel.…”

Section: Introductionmentioning

confidence: 99%

Aging Effect on Microstructure and Machinability of Corrax Steel

GÜLDİBİ

Demir

2020

Eng. Technol. Appl. Sci. Res.

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“…Similar results were obtained by Patel et al in precipitation hardened stainless steels. 35 The presence of tensile mean stress caused the rapid transition from short crack to long crack region in the case of R50 . 1.…”

Section: Transition From Short Crack To Long Crackmentioning

confidence: 99%

Short fatigue crack growth behaviour of a ferritic steel weld metal

Venkateswaran¹,

Raman²,

Pathak³

2005

Science and Technology of Welding and Joining

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The present study deals with the short fatigue crack growth behaviour of a ferritic steel (nuclear grade SA 333 Grade 6 steel) weld metal at two load ratios R of 0.1 and –1. Single edge notched weld joint specimens were tested at different stress levels. The acceleration and deceleration in short crack growth with increasing stress intensity factor range was explained in terms of microstructure of weld metal. Acicular ferrite and grain boundary ferrite acted as barriers to crack growth. Non-propagating cracks were observed due to multiple cracks and blocking by ferrite grain boundaries. Transition crack length, the limiting crack length above which the crack exhibited a typical long crack behaviour, was determined to be 1 mm at R=0.1 and 1.5 mm at R=2 1.

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Short Crack Propagation

Verreman¹

2013

Fatigue of Materials and Structures

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Numerous experimental results highlight the fact that the theory of linear elastic fracture mechanics (LEFM), which is applied to long cracks under confined plasticity, cannot describe the behavior of short cracks that are growing at the smooth surface of a material or from the root of a notch. Depending on the material, the geometry and the type of loading, cracks whose size can vary from grain to millimeter scale do not match the univocal equation (with R constant) between the propagation rate da/dN and variation in stress intensity factor ΔK. The three following differences are observed with respect to long cracks:-for a given ΔK, short cracks grow faster than long cracks (by at least one order of magnitude); -short cracks grow with ΔK values lower than the propagation threshold ΔK th ; -their initial growth can present some decelerations: we can observe a minimum rate, or sometimes, at low loading levels, the crack stops; it becomes a so-called non-propagating crack.In practice, these differences have consequences. Most of the life of parts in service is spent within the short-crack regime, especially in the domain of high-cycle fatigue. The fatigue lives predicted by the calculation methods based on LEFM therefore over estimate the real lives of a material if initial defects of small size are taken into account. In addition, the stress amplitude at the propagation threshold is Chapter written by Yves VERREMAN.

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Growth of small fatigue cracks in PH 13-8 Mo stainless steel

Cited by 8 publications

References 8 publications

Aging Effect on Microstructure and Machinability of Corrax Steel

Aging Effect on Microstructure and Machinability of Corrax Steel

Short fatigue crack growth behaviour of a ferritic steel weld metal

Short Crack Propagation

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