Multistage and High-speed Compression Testing Machine for Obtaining Flow Stress and Microstructure Evolution in Hot Forming of Steels

Yanagida, Akira; Ikeda, Mamoru; Komine, Hisanao; Ye, Jun

doi:10.2355/isijinternational.52.574

Cited by 14 publications

(8 citation statements)

References 13 publications

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“…The PSC test was performed with a 150 kN compression testing machine [26]. The procedure used in the PSC test is shown in Fig.…”

Section: Plane-strain Compression Testmentioning

confidence: 99%

Effect of carbon content on formation of bimodal microstructure and mechanical properties of low-carbon steels subjected to heavy-reduction single-pass hot/warm deformation

Park

2014

Materials Science and Engineering: A

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A compression test simulating heavy-reduction single-pass rolling was conducted to investigate the microstructural evolution based on the formation of a bimodal structure and the mechanical properties of 0.01% and 0.1% carbon steels and niobium steel. When thermomechanical processing was conducted near and above the critical transformation temperature (A c3 ), microstructures of all steels were significantly refined and consisted of equiaxed grains without elongated grains. Nevertheless, these microstructures showed weak or no formation of the bimodal structure or coarse grains with decreasing carbon content, while they showed bimodal structure formation when 0.2% carbon steel was used in our previous © 2014. This manuscript version is made available under the Elsevier user license http://www.elsevier.com/open-access/userlicense/1.0/ research. The average grain size of Nb steel was about 2 m and its microstructure was uniformly refined. These may be attributed to a decrease in the number of nucleation sites with decreasing carbon content in low-carbon steels and the occurrence of nucleation at grain boundaries as well as in grain interiors in Nb steel during processing. Mechanical properties of all steels deformed above the critical transformation temperature exhibited high performance characteristics with superior strength and marked elongation. Their fractographs indicated ductile fracture, which was revealed by SEM observation after a tensile test.

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“…The PSC test was performed with a 150 kN compression testing machine [26]. The procedure used in the PSC test is shown in Fig.…”

Section: Plane-strain Compression Testmentioning

confidence: 99%

Effect of carbon content on formation of bimodal microstructure and mechanical properties of low-carbon steels subjected to heavy-reduction single-pass hot/warm deformation

Park

2014

Materials Science and Engineering: A

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“…The as-received steel used had ferrite-pearlite phases with elongated structures in the rolling direction with an average ferrite grain size of 22 m. As-received steel was machined into rectangular plates of 10×50×20 mm 3 for the plane-strain compression test. The plane-strain compression test was carried out using a 150 kN compression testing machine (Yanagida et al, 2012). A schematic illustration of the compression testing machine is represented in Fig.…”

Section: Methodsmentioning

confidence: 99%

Formation and Mechanical Properties of Bimodal Microstructures in 0.2% Carbon Steel by Heavy-reduction Hot/Warm Compression

Park

2014

Procedia Engineering

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A compression test simulating heavy-reduction hot rolling was performed to investigate the compression behavior during the thermomechanical treatment and to systematically gather basic data on the formation of bimodal structures in 0.2% carbon steel at different deformation temperatures from 700 to 850 o C. The mechanical properties and the formation of such bimodal structures were revealed by field-emission scanning electron microscopy (FE-SEM), electron backscattering diffraction (EBSD) and tensile tests. Microstructures were considerably refined and equiaxed with higher fraction of high-angle grain boundaries when increasing deformation temperature from 700 to 850 o C. Especially, specimen compressed at 850 o C had average ferrite grain sizes of 1.4 m and indicated high a likelihood of the formation of bimodal structure. Ultimate tensile strength and uniform elongation of this specimen were 677 MPa and 8%, respectively, which showed higher strength and twice improved uniform elongation than those of other specimens. Furthermore, their fractography showed dimples with less than 1 and 2-4 m diameter on the fracture surface in 850 o C-compressed specimen, which indicated the bimodal-type dimple.

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“…A multistage and high‐speed compression testing machine, THERMECMASTOR Z machine, was used in the tests . During compression testing, thin sheets of mica (0.2 mm thick) were placed between the surface of the compression specimen and the dies in order to reduce inhomogeneous deformation.…”

Section: Methodsmentioning

confidence: 99%

Modeling Static and Dynamic Kinetics of Microstructure Evolution in Type 316 Stainless Steel

Dupin

Yanagida

2014

steel research int.

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The material genome of type 316 austenitic stainless steel is presented. The material genome is a set of constitutive equations which describes the microstructure evolution during hot forming. Single‐ and double‐compression tests at temperatures of 950–1150°C and with strain rates of 0.01–20 s−1 were performed to obtain the kinetics of dynamic and static events. Inverse analysis, which couples a thermomechanical finite element analysis with experimental data, is used to obtain the flow curves. It compensates the effect of inhomogeneous distributions of deformation and temperature during the compression tests. The sine‐hyperbolic law, which relates the flow stress and the Zener–Hollomon parameter, is used to validate the accuracy of the solution. Regression analysis is applied on the coefficients of the flow curves in order to obtain the parameters of the constitutive equations. Microstructure investigations are used to demonstrate the validity of the newly obtained material genome.

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Multistage and High-speed Compression Testing Machine for Obtaining Flow Stress and Microstructure Evolution in Hot Forming of Steels

Cited by 14 publications

References 13 publications

Effect of carbon content on formation of bimodal microstructure and mechanical properties of low-carbon steels subjected to heavy-reduction single-pass hot/warm deformation

Effect of carbon content on formation of bimodal microstructure and mechanical properties of low-carbon steels subjected to heavy-reduction single-pass hot/warm deformation

Formation and Mechanical Properties of Bimodal Microstructures in 0.2% Carbon Steel by Heavy-reduction Hot/Warm Compression

Modeling Static and Dynamic Kinetics of Microstructure Evolution in Type 316 Stainless Steel

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