The effect of martensite particle size on tensile fracture of surface-carburised AISI 8620 steel with dual phase core microstructure

Erdoğan, Mehmet; Tekeli, Süleyman

doi:10.1016/s0261-3069(02)00065-1

Cited by 112 publications

(56 citation statements)

References 14 publications

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“…A total elongation of about 50% is measured up to the point of fracture ( Fig.3-d) with no decohesion at the ferrite -martensite (F-M) interface. However, separation of prior austenite grain boundaries, as a well-known damage mechanism in the martensite phase of DP steels [10] , has been observed as highlighted by the square area in Fig. 3c and d. Close investigation of the micrographs of the deformed microstructures reveals several of the martensite failure mechanisms in the DP steel studied.…”

Section: Deformation and Crack Initiation In Martensitementioning

confidence: 73%

“…The martensite cracking was found to be more frequent in a coarse martensite microstructure [5,7]. The martensite failure may occur due to : i) decohesion of prior austenite grain boundaries [8,9], ii) fracture of martensite islands due to crack initiation [10] and iii) decohesion at the ferrite-martensite interface [11]. These mechanisms have been determined from post-mortem microstructural investigations, therefore the onset of damage initiation has not been accurately identified.…”

Section: Introductionmentioning

confidence: 99%

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Failure mechanisms in DP600 steel: Initiation, evolution and fracture

Ghadbeigi¹,

Pinna²,

Celotto³

2013

Materials Science and Engineering: A

115

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Section: Deformation and Crack Initiation In Martensitementioning

confidence: 73%

Section: Introductionmentioning

confidence: 99%

Failure mechanisms in DP600 steel: Initiation, evolution and fracture

Ghadbeigi¹,

Pinna²,

Celotto³

2013

Materials Science and Engineering: A

115

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“…The size of martensite regions also affects the strength [16]. Large size of martensite regions is harmful to mechanical properties, due to a decrease in geometrically necessary dislocations and effective barriers to dislocation motion in ferrite [16,[40][41][42]. In addition, the size distribution of martensite regions was not homogeneous, as shown in Figs.…”

mentioning

confidence: 99%

“…9, 13b and d. Some martensite regions exceeding 50 μm (Table 2 and Fig. 13) could reduce ductility, because a coarser martensite may crack at lower strains following stress accumulation [31,40].…”

mentioning

confidence: 99%

Microstructures and mechanical properties of dual phase steel produced by laboratory simulated strip casting

et al. 2015

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Conventional dual phase (DP) steel (0.08C-0.81Si-1.47Mn-0.03Al wt.%) was manufactured using simulated strip casting schedule in laboratory. The average grain size of prior austenite was 117. ±. 44. μm. The continuous cooling transformation diagram was obtained. The microstructures having polygonal ferrite in the range of 40-90%, martensite with small amount of bainite and Widmanstätten ferrite were observed, leading to an ultimate tensile strength in the range of 461-623. MPa and a corresponding total elongation in the range of 0.31-0.10. All samples exhibited three strain hardening stages. The predominant fracture mode of the studied steel was ductile, with the presence of some isolated cleavage facets, the number of which increased with an increase in martensite fraction. Compared to those of hot rolled DP steels, yield strength and ultimate tensile strength are lower due to large ferrite grain size, coarse martensite area and Widmanstätten ferrite. Abstract: Conventional dual phase (DP) steel (0.08C-0.81Si-1.47Mn-0.03Al wt. %) was manufactured using simulated strip casting schedule in laboratory. The average grain size of prior austenite was 117±44 μm. The continuous cooling transformation diagram was obtained. The microstructures having polygonal ferrite in the range of 40-90 %, martensite with small amount of bainite and Widmanstätten ferrite were observed, leading to an ultimate tensile strength in the range of 461 -623 MPa and a corresponding total elongation in the range of 0.31 -0.10. All samples exhibited three strain hardening stages. The predominant fracture mode of the studied steel was ductile, with the presence of some isolated cleavage facets, the number of which increased with an increase in martensite fraction. Compared to those of hot rolled DP steels, yield strength and ultimate tensile strength are lower due to large ferrite grain size, coarse martensite area and Widmanstätten ferrite. Disciplines Engineering | Science and Technology Studies

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“…This kind of combination makes them possess continuous yielding, low yield strength, high tensile strength, high initial work-hardening rates, superior uniform and total elongation compared to other high-strength low alloy (HSLA) steels at a given strength level [7][8][9][10] . At present, the usual methods to produce dual-phase steels are either intercritical annealing 3,4,7,8 or thermomechanical control process (TMCP) 5,11,12 .…”

Section: Introductionmentioning

confidence: 99%

Effect of initial microstructures on the properties of Ferrite-Martensite Dual-Phase pipeline steels with Strain-Based design

Zuo

et al. 2012

Mat. Res.

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This study aims to investigate the effect of initial microstructures on the properties of ferritemartensite dual-phase pipeline steels with strain-based design. For this purpose, the as-received acicular ferrite steels were first austenitized at 920 °C for 15 minutes followed by air cooling and water quenching to produce ferrite-pearlite and ferrite-martensite microstructure, respectively. Subsequently, the steels with ferrite-pearlite, ferrite-martensite and as-received acicular ferrite microstructure were intercritically annealed at 820 °C for 10 minutes followed by water quenching to produce three different ferrite-martensite dual-phase microstructures. Tensile tests, Vickers hardness and Charpy impact tests were carried out to investigate the mechanical properties. Scanning electron microscope was used to analyze the microstructures and tensile fractographs. The results showed that all the tensile specimens of these three different ferrite-martensite dual-phase steels fractured in ductile mode, however, their microstructures and mechanical properties varied significantly. By contrast, the ferrite-martensite dual-phase steel derived from acicular ferrite initial microstructure had optimal combination of the strength, toughness and deformability, which provided a good candidate for the pipeline steels with strain-based design used in severe geological environments.

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The effect of martensite particle size on tensile fracture of surface-carburised AISI 8620 steel with dual phase core microstructure

Cited by 112 publications

References 14 publications

Failure mechanisms in DP600 steel: Initiation, evolution and fracture

Failure mechanisms in DP600 steel: Initiation, evolution and fracture

Microstructures and mechanical properties of dual phase steel produced by laboratory simulated strip casting

Effect of initial microstructures on the properties of Ferrite-Martensite Dual-Phase pipeline steels with Strain-Based design

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