Zobrazeno 1 - 10
of 121
pro vyhledávání: '"Yuuji Kimura"'
Publikováno v:
Metals, Vol 12, Iss 3, p 440 (2022)
This study investigated the hydrogen-related fracture behavior in as-quenched low-carbon martensitic steel under a constant loading tensile test with various applied stresses. We found that the fracture time in the constant loading tensile test decre
Externí odkaz:
https://doaj.org/article/cf0acfbfc8934301b3bf7d2f71d4f3f2
Autor:
Tadanobu Inoue, Yuuji Kimura
Publikováno v:
Materials, Vol 15, Iss 3, p 867 (2022)
Improving the balance of strength and toughness in structural materials is an ongoing challenge. Delamination and grain refinement are some of the methods used to do this. In this paper, two different steels, 0.15% C–0.3% Si–1.5% Mn–Fe and 0.4%
Externí odkaz:
https://doaj.org/article/c900ed1262e342fb9d2c05584c043d4a
Publikováno v:
Materials, Vol 14, Iss 16, p 4609 (2021)
Inhomogeneous plastic deformation damages the surface quality of a product in the metal forming process. Therefore, it is necessary to investigate the plastic instability of a metal. Tempered martensite is a common microstructure of medium-carbon ste
Externí odkaz:
https://doaj.org/article/c30f9f8bc6ae4f9fba40d10acfea2554
Publikováno v:
Materials, Vol 14, Iss 8, p 1865 (2021)
A grain is surrounded by grains with different crystal orientations in polycrystalline plain low-carbon steel. The grain is constrained by its adjacent grains in the tension process. The interaction of the grain with the adjacent grains was investiga
Externí odkaz:
https://doaj.org/article/f3f39721e1794be4a6222c8f5e01cbf6
Publikováno v:
Materials, Vol 14, Iss 7, p 1634 (2021)
Ductile-to-brittle transition (DBT) temperature and brittle fracture stress, σF, are important toughness criteria for structural materials. In this paper, low-carbon steels with an ultrafine elongated grain (UFEG) structure (transverse grain size 1.
Externí odkaz:
https://doaj.org/article/f9360e3aae6644c1a99247a9f4d6fda5
Publikováno v:
Metals, Vol 10, Iss 6, p 774 (2020)
On a macroscale, the stress–strain curve of polycrystalline steel exhibits perfectly linear behavior in the elastic tension region. We observed that the strain distribution within grains is inhomogeneous in the range of the elastic deformation regi
Externí odkaz:
https://doaj.org/article/439a64d8222b4cdbbdb3357885266ddf
Publikováno v:
Nihon Kikai Gakkai ronbunshu, Vol 84, Iss 866, Pp 18-00237-18-00237 (2018)
The relationship among strength, ductility, toughness and microstructure was studied in order to find out microstructure image of stronger and tougher steel. Initial samples with two different microstructures, ferrite-pearlite and martensite (and/or
Externí odkaz:
https://doaj.org/article/f4f5ef8354ce4c22b255a40c7053b7fe
Publikováno v:
Nihon Kikai Gakkai ronbunshu, Vol 84, Iss 860, Pp 17-00493-17-00493 (2018)
Delayed fracture susceptibility of 1.8 GPa-class ultra-high strength bolts was evaluated by an outdoor exposure test. Low-alloy steel bars with a chemical composition of Fe-0.4%C-2%Si-1%Cr-1%Mo (mass%) were quenched and tempered at 500 °C for 1 h, c
Externí odkaz:
https://doaj.org/article/8c201fd3bcd04ba9a995aa923c682639
Autor:
Tadanobu INOUE, Yuuji KIMURA
Publikováno v:
Nihon Kikai Gakkai ronbunshu, Vol 82, Iss 844, Pp 16-00246-16-00246 (2016)
The criterion of micro-crack initiation on stronger, tougher steel, i.e., fail-safe steel, with an ultrafine elongated grain (UFEG) structure was studied through a combinations of numerical simulation and experimental observations and measurements. T
Externí odkaz:
https://doaj.org/article/2f292bc1b981470392c07cc1e765d628
Publikováno v:
Nihon Kikai Gakkai ronbunshu, Vol 81, Iss 830, Pp 15-00281-15-00281 (2015)
A 1800 MPa class steel bar with an ultrafine elongated grain (UFEG) structure was fabricated by multipass caliber rolling at 500°C. The static three-point bending test was conducted in a temperature range from 100°C to -196°C. The behaviors of cra
Externí odkaz:
https://doaj.org/article/d95d9f84fcae4553ba903ab1b49b249f