Ultrasonic study on the change in elastic properties of cementite with temperature and Mn content using nearly full density polycrystalline bulk samples

Umemoto, Minoru; Kruger, S. E.; Ohtsuka, Hideyuki

doi:10.1016/j.msea.2018.10.115

Cited by 6 publications

(23 citation statements)

References 31 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The selected mechanical properties of cementite at room temperature are summarized in Table 1. 8,10,13,23,26,[57][58][59] * 1 Both experimentally measured (at room temperature and one atm) and theoretically estimated (at 0 K and 0 GPa) values are shown. The most reliable experimental data were chosen based on the sample condition (a large-size singlephase cementite, without alloying elements and a small void fraction) and measurement method (well established with small error).…”

Section: Experimental Data Of Mechanical Properties Of Cementitementioning

confidence: 99%

“…These elastic constants can be calculated from the sound velocities of the longitudinal and shear modes. 51,57) The sound velocity can be measured by the ultrasonic pulse-echo method, in particular, the laser ultrasonic method is advantageous for the measurement of the temperature and pressure dependence of sound velocity owing to its non-contact characteristics. The sound velocity itself is an important quantity for geophysicists because the sound velocity of the Earth's inner core is one of a few measurable physical quantities.…”

Section: Sound Velocity In Cementitementioning

confidence: 99%

“…These are summarized in Table 2. 40,41,43,51,57) A general measurement method is to use a vibrator or laser to apply ultrasonic vibration to one side of a sample with parallel surfaces, measure the time it takes for the ultrasonic waves to reflect on the front and back surfaces, and determine the speed of the sound waves. When the thickness of the sample is several millimeters, the time for the sound wave to move back and forth in the sample is approximately several microseconds.…”

Section: Sound Velocity In Cementitementioning

confidence: 99%

“…Umemoto et al 57) measured the sound velocity by the ultrasonic pulse method using a sample with 98% X-ray density prepared by MA and SPS and obtained V L = 5 770 ± 11 m/s and V S = 3 076 ± 10 m/s. Correcting the effect of porosity (2%) on the sound velocity, the sound velocity for the 100% density sample was estimated to be V L0 = 5 870 m/s and V S0 = 3 104 m/s.…”

Section: Sound Velocity In Cementitementioning

confidence: 99%

See 3 more Smart Citations

Mechanical Properties of Cementite

Umemoto

Ohtsuka

2022

ISIJ Int.

Self Cite

View full text Add to dashboard Cite

This review focuses on the mechanical properties of single-phase cementite. The mechanical properties of interest are 1) sound velocity, 2) elastic constants, 3) hardness, 4) plastic deformation mechanism, 5) wear, 6) fracture toughness, and 7) crystal orientation anisotropy. The effects of temperature, magnetic transition, and alloying elements on the sound velocity, elastic constants, and hardness were reviewed. Furthermore, experimental values of the above mechanical properties as well as other parameters, such as the specimen shape, the quantity of alloying elements, and the measurement method, were collected. A large variation was observed in the reported experimental values. The main reason for this is that cementite is metastable, and it is difficult to prepare large single-phase samples. Other factors, such as sample shape, measurement method, alloying element, magnetic transformation, and crystal orientation anisotropy, also influenced the measured values. Studies using first-principles calculations of cementite were also reviewed. The crystal orientation anisotropy of each elastic constant of single-crystal cementite based on the first-principles calculations are summarized, and its comparison with the experimental results is discussed. By comparing the elastic constants obtained by the first-principles calculations with the measured values, the former values of Young's modulus and shear modulus are several % and bulk modulus and Poisson's ratio are several tens of % larger than those of the latter. This is thought to be because of the difference in temperature between 0 K (first-principles calculations) and room temperature (measured value), and theoretical and experimental studies in which the temperature is changed are expected.

show abstract

Section: Experimental Data Of Mechanical Properties Of Cementitementioning

confidence: 99%

Section: Sound Velocity In Cementitementioning

confidence: 99%

Section: Sound Velocity In Cementitementioning

confidence: 99%

Section: Sound Velocity In Cementitementioning

confidence: 99%

See 2 more Smart Citations

Mechanical Properties of Cementite

Umemoto

Ohtsuka

2022

ISIJ Int.

Self Cite

View full text Add to dashboard Cite

show abstract

“…Our research group has previously proposed the method to fabricate a bulk single phase cementite sample using the mechanical ball milling and pulse current sintering (PCS) processes [8,9]. This method enabled us to investigate the properties of cementite alone such as hardness [10], elastic properties [11], and the hydrogen permeation property [12]. In this study, by employing the method, we investigated the deformation behavior of cementite by means of a neutron diffraction experiment.…”

Section: Introductionmentioning

confidence: 99%

Deformation Texture of Bulk Cementite Investigated by Neutron Diffraction

et al. 2022

View full text Add to dashboard Cite

Understanding the deformation mechanism of cementite such as on a slip plane is important with regard to revealing and improving the mechanical property of steels. However, the deformation behavior of cementite has not been well investigated because of the difficulty of sample preparation given the single phase structure of cementite. In this study, by fabricating bulk single phase cementite samples using the method developed by the authors, the deformation texture formed by uniaxial compression was investigated using both electron back scatter diffraction and neutron diffraction. The fabricated sample had a random texture before the compression. After applying a compressive strain of 0.5 at 833 K, (010) fiber texture was formed along the compressive axis. It has been suggested from this trend that the primary slip plane of cementite is (010).

show abstract