In-situ neutron diffraction during tension-compression cyclic deformation of a pearlite steel

Wang, Yanxu; Tomota, Yō; Harjo, Stefanus; Gong, Wu; Ohmura, Takahito

doi:10.1016/j.msea.2016.08.122

Cited by 27 publications

(10 citation statements)

References 41 publications

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“…The in situ neutron measurements were conducted over {200}, {220} and {311} grain families and the macroscopic stress and the lattice strain exhibited different values of elastic constants, hence indicating material anisotropy. Similar studies on in situ neutron diffraction with mechanical loading have been reported on stainless steel alloys such as 316 H ( Ref 7,22), duplex steel (Ref 8, 23), bearing steel (Ref 16) and pearlitic steel (Ref 24,25). In (Ref 7), 316 H austenitic steel was found to exhibit higher local strain in {200} grain family and concluded that the failure was controlled by the accumulated equivalent plastic strain.…”

Section: Introductionsupporting

confidence: 67%

Experimental Investigation of Lattice Deformation Behavior in S355 Steel Weldments Using Neutron Diffraction Technique

Biswal

Mehmanparast

Ganguly

et al. 2021

J. of Materi Eng and Perform

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This study aims to investigate the influence of welding process on the elastic lattice deformation and its effects on fatigue and fracture behavior of S355 G10+M steel, which is widely used in fabrication of offshore wind turbine monopile structures. In situ neutron diffraction measurements were taken on cross-weld test samples at room temperature to monitor the evolution of intergranular strains under static and cyclic loading conditions. Both static and cyclic test results have shown that the {200} orientation exhibits the least load carrying capacity while {211} had the maximum stiffness. The hkl-specific response predicted using Reuss and Kröner model were found to agree well with experimental values obtained for the heat-affected zone for all the orientations; however, discrepancies between the experimental and model predictions have been observed for the base metal and weld metal. Moreover, the microstructural differences between the weld metal and heat-affected zone resulted in the maximum elastic–plastic strain mismatch at the interface of the two regions. The results from this experiment would be useful to understand the role of crystal-specific microstrains and lattice deformation on fatigue and fracture behavior of thick-walled monopile weldments.

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Section: Introductionsupporting

confidence: 67%

Experimental Investigation of Lattice Deformation Behavior in S355 Steel Weldments Using Neutron Diffraction Technique

Biswal

Mehmanparast

Ganguly

et al. 2021

J. of Materi Eng and Perform

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Section: Tension-compression Asymmetry Behaviormentioning

confidence: 99%

“…Since the applied stresses vary differently under tension and compression at the same strain amplitude, clarifying the relationship between the macroscopic applied stress and microscopic lattice strain is necessary. We followed Wang et al's [39] and Young et al's Since the applied stresses vary differently under tension and compression at the same strain amplitude, clarifying the relationship between the macroscopic applied stress and microscopic lattice strain is necessary. We followed Wang et al's [39] and Young et al's [40] methods to estimate the effective phase stresses in understanding the role of α-matrix and γ-phase under applied stresses.…”

Section: Tension-compression Asymmetry Behaviormentioning

confidence: 99%

“…We followed Wang et al's [39] and Young et al's Since the applied stresses vary differently under tension and compression at the same strain amplitude, clarifying the relationship between the macroscopic applied stress and microscopic lattice strain is necessary. We followed Wang et al's [39] and Young et al's [40] methods to estimate the effective phase stresses in understanding the role of α-matrix and γ-phase under applied stresses. We calculated the average von Mises equivalent stress for each phase [41] on the assumption that two orthogonal transverse strain components (σ 11 = σ 22 ) are equal for cylindrical dog-bone sample.…”

Section: Tension-compression Asymmetry Behaviormentioning

confidence: 99%

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Transient Phase-Driven Cyclic Deformation in Additively Manufactured 15-5 PH Steel

Lam

Liu

et al. 2022

Materials

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The present work extends the examination of selective laser melting (SLM)-fabricated 15-5 PH steel with the 8%-transient-austenite-phase towards fully-reversed strain-controlled low-cycle fatigue (LCF) test. The cyclic-deformation response and microstructural evolution were investigated via in-situ neutron-diffraction measurements. The transient-austenite-phase rapidly transformed into the martensite phase in the initial cyclic-hardening stage, followed by an almost complete martensitic transformation in the cyclic-softening and steady stage. The compressive stress was much greater than the tensile stress at the same strain amplitude. The enhanced martensitic transformation associated with lower dislocation densities under compression predominantly governed such a striking tension-compression asymmetry in the SLM-built 15-5 PH.

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“…Изучение природы и эволюции структурно-фазовых изменений рельсовой стали в процессе эксплуатации представляется возможным на основе анализа деформационного поведения металлов в условиях интенсивной пластической деформации [4][5][6]. При самых различных видах и режимах пластической деформации в кристаллических материалах с различным типом кристаллической решетки наблюдается фундаментальное явление фрагментации, т.е.…”

Section: Introductionunclassified

Evolution of the Lamellar Pearlite Structure of Rail Steel under Tension

Aksenova¹,

Громов²,

Ivanov³

et al. 2023

Известия АлтГУ

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In this paper, the properties of rail steel subjected to fracture under uniaxial tension deformation are studied. Mechanical properties of rail steel, defective substructure of lamellar pearlite, and fracture surface of rail steel are investigated using methods of modern physical materials science. Tensile strength is found to vary from 1247 to 1335 MPa, and the fracture strain of the samples changes from 0.22 to 0.26. The deformation of the rail steel is accompanied by the process of breaking the ferrite plates into fragments by low angle boundaries along with the significant increase in the scalar dislocation density to 7.9-1010 cm-2 (the scalar dislocation density of the original rail steel is 3.2 -1010 cm-2). Also, there is a formation of internal stress fields appearing in the form of bend extinction contours. The sources of stress fields are identified. It is revealed that cementite plates are fractured by cutting and dissolution with subsequent transfer of carbon to ferrite plates by moving dislocations and formation of round-shaped nanodimensional (8.3 nm) round shaped particles of tertiary cementite. It is shown that the dissolution of cementite plates is accompanied by fragmentation (into coherent scattering regions with an average size of 9.3 nm).

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In-situ neutron diffraction during tension-compression cyclic deformation of a pearlite steel

Cited by 27 publications

References 41 publications

Experimental Investigation of Lattice Deformation Behavior in S355 Steel Weldments Using Neutron Diffraction Technique

Experimental Investigation of Lattice Deformation Behavior in S355 Steel Weldments Using Neutron Diffraction Technique

Transient Phase-Driven Cyclic Deformation in Additively Manufactured 15-5 PH Steel

Evolution of the Lamellar Pearlite Structure of Rail Steel under Tension

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