On the Bauschinger effect in two-ductile-phase steels

Tomota, Yō; Kuroki, Koshiro

doi:10.1016/0036-9748(80)90201-x

Cited by 9 publications

(5 citation statements)

References 5 publications

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“…Zhonghua and Haicheng [17] suggested that given that the BE is the result of the interaction of the soft and the hard phase, the highest Bauschinger effect would be expected at a martensite volume fraction of 50%, where for an equiaxed microstructure, the interface area per unit volume would be the highest. The above effect was partially confirmed by Tomata and Kuroki [38] who observed a saturation of the Bauschinger strain, β 1 , at 50% volume fraction of hard phase for quenched and aged high carbon steel having a microstructure of nearly spherical grains. Nevertheless, the quenched condition of the same steel did not develop a saturation point below 70% of hard phase.…”

Section: Bauschinger Parameterssupporting

confidence: 59%

On the Bauschinger effect in dual phase steel at high levels of strain

Weiß

Kupke

Manach

et al. 2015

Materials Science and Engineering: A

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Section: Bauschinger Parameterssupporting

confidence: 59%

On the Bauschinger effect in dual phase steel at high levels of strain

Weiß

Kupke

Manach

et al. 2015

Materials Science and Engineering: A

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“…3 for specimen A and Fig. 4 for specimen C. According to Tomota and Kuroki,15) the characteristics of the Bauschinger effect are evaluated by using either the Baushinger stress σ B (=σ P-| σ R|) or the Bauschinger strain β0.5. The Bauschinger stresses obtained here are 123…”

Section: Resultsmentioning

confidence: 99%

In Situ Neutron Diffraction during Tension-Compression Deformation for Nodular Graphite Cast Irons

et al. 2013

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“…Such tendency resembles those reported by Tomota and Kuroki. 8) Figure 5 shows lattice strain e 111 yielded from (111) diffraction peaks of g phase and e 110 obtained from (110) reflections of a phase as a function of applied stress for all five examined alloys. Because stress-free d 0 hkl for a and g phase were determined from measurements of the reference a and g single-phase alloys before deformation, respectively, both curves of e hkl start from zero.…”

Section: Bauschinger Effect Obtained By Stepwise Tension-mentioning

confidence: 99%

“…5,6) Stress and strain partitioning between constituent phases in ferrite (a)-austenite (g) dual phase Fe-Cr-Ni alloys during tensile deformation have been successfully estimated by using in situ neutron diffraction experiments during the tensile tests in our previous work. 7) According to Tomota and Kuroki's work 8) on monotonous tension-compression tests for similar alloys, Bauschinger effects were found more pronounced in the dual phase alloys than in the corresponding a/g singlephase alloys. The phase stresses generated due to the heterogeneity of the plastic deformation are supposed to be the main reason of the large Bauschinger effect, 8,9) but little experimental evidence has been reported so far.…”

Section: Introductionmentioning

confidence: 97%

“…7) According to Tomota and Kuroki's work 8) on monotonous tension-compression tests for similar alloys, Bauschinger effects were found more pronounced in the dual phase alloys than in the corresponding a/g singlephase alloys. The phase stresses generated due to the heterogeneity of the plastic deformation are supposed to be the main reason of the large Bauschinger effect, 8,9) but little experimental evidence has been reported so far. Although Xray stress measurements have strongly supported these suggestions, 10) it is still difficult to distinguish the phase stress from the macroscopic residual stress on specimen surface.…”

Section: Introductionmentioning

confidence: 97%

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Bauschinger Effect in .ALPHA.-.GAMMA. Dual Phase Alloys Studied by In Situ Neutron Diffraction.

et al. 2002

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In situ neutron diffraction experiments during tension-compression deformation were performed on five Fe-Cr-Ni alloys with the volume fraction of ferrite (a) ranging from 0.0 to 100 %. Tensile deformation was applied in a step by step manner up to a strain of 1.3-2.0 % followed by compressive deformation, and neutron diffraction spectra were recorded during temporary stops of a deformation machine with fixed crosshead. (111) reflection of austenite and (110) of ferrite, respectively, were measured simultaneously by using a position sensitive detector. Elastic lattice strains in both constituent phases were evaluated from measured diffraction spectra as a function of external load. Based on these experimental results, heterogeneous deformation behavior in the a-g dual phase alloys is discussed considering the Bauschinger effect. It is concluded that large compressive residual lattice strains detected in the g phase after tensile pre-straining, causes the large Bauschinger effect in a-g dual phase alloys.KEY WORDS: in situ strain measurement; neutron diffraction; a-g dual phase alloy; tension-compression deformation; Bauschinger effect.fractometer TKSN400 installed at the medium-power reactor LWR-15 in Nuclear Physics Institute (NPI). A twocrystal sandwich monochromator has permitted us to use neutrons with two different wavelengths simultaneously; l 1 ϭ0.147 nm (Ge(311)) and l 2 ϭ0.27 nm (Si(111)). The diffractometer was also equipped with a deformation device enabling both tensile and compressive tests up to a maximum loading of Ϯ20 kN.The geometric arrangement of the in situ strain measuring system is illustrated in Fig. 1, where width of two Cdmasks was of 2.0 mm. Shape and dimensions of tensioncompression specimens were the same as those used in Ref. 7). Overall specimen strain was measured by means of a strain gauge glued on specimen surface. From here on, it is called macroscopic strain. A specimen was strained in tension in a step-by-step manner up to 0.013-0.020 followed by unloading, and subsequently deformed in compression similarly down to reversed strains of 0.010-0.0013. Diffraction spectra were collected during temporary stops upon a crosshead-fixed regime. An exposure time of 4 ks was necessary to obtain sufficient statistics to perform a reliable analysis of diffraction profiles. After the crosshead was fixed, the applied stress decreased rapidly within 0.4 ks and afterwards slowly by less than 10 MPa as reported in Ref. 7). Such relaxation behavior was observed in all examined cases. Diffraction profiles were measured for 4.0 ks and the uncertainty of the applied stress during the diffraction experiments is then considered to be approximately of 10 MPa. If we employ the testing method with constant load control, the resulting data will suffer from similar ambiguity in strains because of creep deformation. Therefore, such a kind of experimental error cannot be avoided in this case. In the present analysis, the applied stresses and the macroscopic strains recorded after holding time of 4 ks were us...

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On the Bauschinger effect in two-ductile-phase steels

Cited by 9 publications

References 5 publications

On the Bauschinger effect in dual phase steel at high levels of strain

On the Bauschinger effect in dual phase steel at high levels of strain

In Situ Neutron Diffraction during Tension-Compression Deformation for Nodular Graphite Cast Irons

Bauschinger Effect in .ALPHA.-.GAMMA. Dual Phase Alloys Studied by In Situ Neutron Diffraction.

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