Effect of grain boundary segregation of carbon on critical grain boundary strength of ferritic steel

Araki, Satoshi; Mashima, Kazuto; Masumura, Takuro; Tsuchiyama, Toshihiro; Takaki, Setsuo; Ohmura, Takahito

doi:10.1016/j.scriptamat.2019.05.001

Cited by 40 publications

(20 citation statements)

References 21 publications

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“…The near equivalent determinations for Figure 3 of E r = 213 GPa for the Alhafez et al [5] simulated test result as compared with E r = 224.5 GPa for the Araki et al [11] experimental test is surprising on the basis of the elastic anisotropy of α-iron, separate from Alhafez et al having employed a rigid indenter. For example, average values of E 111 = 239.5 GPa and E 100 = 136 GPa are obtained from recently reported elastic constants [12,13].…”

Section: Comparison Of Hertzian Elastic Loading Behaviorsmentioning

confidence: 80%

“…Araki, Mashima, Masumura, Tsuchiyama, Takaki and Ohmura [11] presented nano-indentation test measurements made on interior α-iron grains of a polycrystalline material with (111) crystal surfaces. The purpose was to make a comparison with same test measurements obtained on the material grain boundaries.…”

Section: Experimental and Simulated Nano-indentation Hardness Of α-Irmentioning

confidence: 99%

“…The upper-limiting elastic contact stress, σ e , for the experimental calculation in Figure 3 of 15.6 GPa was determined by both methods of stress evaluation indicated in Equation (2). Araki et al [11] had obtained a corresponding relatively low shear stress of~6 GPa for the P − h measurement on a Hertzian basis and attributed the result to dislocation nucleation and multiplication. Table 1 provides a comparison of the experimental Araki et al [11] test parameters with those obtained in simulated tests on α-iron by Alhafez et al [5] and in two other model simulations [19,20].…”

Section: Plastic Yielding and Strain Hardeningmentioning

confidence: 99%

“…Araki et al [11] had obtained a corresponding relatively low shear stress of~6 GPa for the P − h measurement on a Hertzian basis and attributed the result to dislocation nucleation and multiplication. Table 1 provides a comparison of the experimental Araki et al [11] test parameters with those obtained in simulated tests on α-iron by Alhafez et al [5] and in two other model simulations [19,20]. The table includes, for the employment of different D values, the limiting elastic contact stress, σ e ; pop-in stress, σ pop-in ; and comparable strain hardening coefficient in compression, (∆σ c /∆ε c ) = (5/3)(∆σ p /∆ε p ) at an effective compressive strain, ε c .…”

Section: Plastic Yielding and Strain Hardeningmentioning

confidence: 99%

“…Experimental[11] and simulated[5] nano-indentation stress-strain dependencies calculated for α-iron (111) and(100)crystal surfaces employing different respective D values of 1100 and 20 nm. Also included in Figure 3 are same-type calculations made for a simulated nano-indentation test run by Alhafez et al [5] on a 'defective' α-iron (100) crystal surface.…”

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confidence: 99%

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Dislocation Reaction Mechanism for Enhanced Strain Hardening in Crystal Nano-Indentations

Armstrong

Elban

2019

Crystals

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Stress–strain calculations are presented for nano-indentations made in: (1) an ammonium perchlorate (AP), NH4ClO4, {210} crystal surface; (2) an α-iron (111) crystal surface; (3) a simulated test on an α-iron (100) crystal surface. In each case, the calculation of an exceptionally-enhanced plastic strain hardening, beyond that coming from the significant effect of small dislocation separations in the indentation deformation zone, is attributed to the formation of dislocation reaction obstacles hindering further dislocation movement. For the AP crystal, the exceptionally-high dislocation reaction-based strain hardening, relative to the elastic shear modulus, leads to (001) cleavage cracking in nano-, micro- and macro-indentations. For α-iron, the reaction of (a/2) <111> dislocations to form a [010] Burgers vector dislocation obstacles at designated {110} slip system intersections accounts for a higher strain hardening in both experimental and simulated nano-indentation test results. The α-iron stress–strain calculations are compared, both for the elastic deformation and plastic strain hardening of nano-indented (100) versus (111) crystal surfaces and include important observations derived from internally-tracked (a/2) <010> Burgers vector dislocation structures obtained in simulation studies. Additional comparisons are made between the α-iron calculations and other related strength properties reported either for bulk, micro-pillar, or additional simulated nano-crystal or heavily-drawn polycrystalline wire materials.

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Section: Comparison Of Hertzian Elastic Loading Behaviorsmentioning

confidence: 80%

Section: Experimental and Simulated Nano-indentation Hardness Of α-Irmentioning

confidence: 99%

Section: Plastic Yielding and Strain Hardeningmentioning

confidence: 99%

Section: Plastic Yielding and Strain Hardeningmentioning

confidence: 99%

mentioning

confidence: 99%

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Dislocation Reaction Mechanism for Enhanced Strain Hardening in Crystal Nano-Indentations

Armstrong

Elban

2019

Crystals

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Nitrogen‐Enhanced Temperature Dependence of Grain Refinement Strengthening in Austenitic Stainless Steel

Tsuchiyama

Tsugumi²,

Ma³

et al. 2022

steel research int.

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Hall–Petch relationships at room temperature and lower temperatures are investigated for 316L steel (low‐N steel) and 0.43% nitrogen‐added 316L steel (high‐N steel) produced by solution nitriding. The yield stress is separated into thermal and athermal components, and the effects of nitrogen on the former are clarified. In the case of low‐N steel, the yield stress increases as the temperature decreases, and the degree of the increase is greater for fine‐grained steels. This is not only due to the increase in friction stress (including solid solution strengthening) but also results from the increase in grain refinement strengthening caused by the increase in the Hall–Petch coefficient at low temperatures. By contrast, in high‐N steel, the temperature dependence of the yield stress is more remarkable than in low‐N steel. However, the amount of increase in friction stress at low temperatures is not very different between the low‐N and high‐N steels. Instead, the increase in grain refinement strengthening caused by nitrogen is greatly enhanced at lower temperatures. This result suggests that the combination of nitrogen addition and grain refining is very effective at strengthening austenitic steels under low temperatures.

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Ultrahigh yield strength and large uniform elongation achieved in ultrafine-grained titanium containing nitrogen

et al. 2022

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Effect of grain boundary segregation of carbon on critical grain boundary strength of ferritic steel

Cited by 40 publications

References 21 publications

Dislocation Reaction Mechanism for Enhanced Strain Hardening in Crystal Nano-Indentations

Dislocation Reaction Mechanism for Enhanced Strain Hardening in Crystal Nano-Indentations

Nitrogen‐Enhanced Temperature Dependence of Grain Refinement Strengthening in Austenitic Stainless Steel

Ultrahigh yield strength and large uniform elongation achieved in ultrafine-grained titanium containing nitrogen

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