Influence of Reversion Austenite on Initiation and Propagation of Fatigue Crack of Maraging Steel.

NAGANO, Takanori; Kawagoishi, Norio; MORIYAMA, Michihiko

doi:10.1299/kikaia.69.633

Cited by 8 publications

(5 citation statements)

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“…The present findings can help make maraging steel an attractive material, even for applications involving fatigue-type loading. Earlier studies showed that a small amount of reverted austenite (2 %-3 % vol), resulted in a beneficial effect on the fatigue life of 18 % nickel maraging steel grades 300 and 350 [7,[13][14][15]. The present study showed that a similar benefit accrues in the case of grade 250 also.…”

Section: Discussionsupporting

confidence: 78%

“…Heat treatment of maraging steels helps in the improvement of fatigue life. Overaging to produce 2 % -3 % vol of reverted austenite (RA) is known to improve the fatigue limit of maraging steel [7,[12][13][14]. Further increase in overaging is detrimental to fatigue life.…”

Section: Introductionmentioning

confidence: 99%

“…The fatigue limit was found to be higher with 3 % of reverted austenite in the microstructure in a maraging steel with 18 % nickel, 8 % cobalt, 5 % molybdenum [7,12]. Higher fatigue limit was observed in the C300 and C350 grade maraging steel with 2 % of reverted austenite [13,14].…”

Section: Introductionmentioning

confidence: 99%

“…Previous studies on the influence of reverted austenite on the fatigue limit were performed using the rotating bending approach [12,7,13,14]. The rotating bending fatigue could produce results that are very different from the results produced with axial loading.…”

Section: Introductionmentioning

confidence: 99%

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Influence of reverted austenite on fatigue life of 18 % nickel maraging steel

Rohit,

Rao M

2023

Materialwissenschaft Werkst

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Maraging steels containing 18 % nickel are based on a low‐carbon iron‐nickel‐cobalt‐molybdenum system. These steels demonstrate a remarkable combination of high strength and high toughness. To investigate the effect of overaging and resulting austenite reversion on the fatigue behavior of C250 maraging steel, specimens in the solution annealed state were overaged at 510 °C for various intervals, resulting in volume fractions of reverted austenite ranging from 2.6 % to 11.4 %. The staircase method was used to calculate the fatigue limit. S−N curves were generated by testing a minimum of four stress levels and at least three samples at each stress level. Basquin's equation was used to fit the experimental stress‐life data, and the Basquin exponent and fatigue strength coefficient were calculated. The presence of 2.6 % reverted austenite in the microstructure improved the fatigue limit and fatigue ratio, without significantly reducing tensile strength. The results can be interpreted in terms of reverted austenite having a crack blunting effect on the propagating cracks. A small amount of reverted austenite in the range of 2 %–3 % vol has a beneficial effect on the fatigue life.

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Section: Discussionsupporting

confidence: 78%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Influence of reverted austenite on fatigue life of 18 % nickel maraging steel

Rohit,

Rao M

2023

Materialwissenschaft Werkst

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“…It was reported that even ambient environment could affect fatigue strength of high strength alloys (12)- (15) , implying the importance of interaction between ambient air and fatigue cracks. On the other hand, non-ferrous metallic alloys usually do not show distinct fatigue limit and their behavior in gigacycle fatigue was not well understood.…”

Section: Introductionmentioning

confidence: 99%

Crack Growth Behavior of Al Alloy 7075-T6 under Ultrasonic Fatigue

Chen

Kawagoishi

Oki

et al. 2008

JMMP

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In order to investigate the effect of loading frequency on crack growth behavior, ultrasonic fatigue and rotating bending fatigue tests were carried out for an extruded age-hardened Al alloy 7075-T6 in ambient air and in N 2 gas. Fatigue strength increased in ultrasonic fatigue due to the retardation of crack initiation and its early propagation. In ultrasonic fatigue, however, crack growth transition took place from tensile mode to shear mode when cracks grew faster than ~3x10 -9 m/cycle. As a result, macroscopic crack paths changed from nearly vertical to stress axis to oblique ~35 degrees against the axis. Fracture mechanism involved in ultrasonic fatigue also changed from striations featured to transgranular facets characterized with microscopic voids. The relation between the applied stress, σ a , and the crack depth at the crack growth transition, b T , can be expressed as σ a n b T = constant. The results were discussed from the viewpoints of time dependent environmental effect and the texture of the alloy.

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Fatigue Behavior of 18% Ni Maraging Steels: A Review

Rohit¹,

Muktinutalapati

2021

J. of Materi Eng and Perform

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Influence of Reversion Austenite on Initiation and Propagation of Fatigue Crack of Maraging Steel.

Cited by 8 publications

References 0 publications

Influence of reverted austenite on fatigue life of 18 % nickel maraging steel

Influence of reverted austenite on fatigue life of 18 % nickel maraging steel

Crack Growth Behavior of Al Alloy 7075-T6 under Ultrasonic Fatigue

Fatigue Behavior of 18% Ni Maraging Steels: A Review

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