Tetsu-to-Hagané
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ONLINE ISSN: 1883-2954
PRINT ISSN: 0021-1575

Tetsu-to-Hagané Advance Publication

  • Analysis of Carbon Partitioning at an Early Stage of Proeutectoid Ferrite Transformation in a Low Carbon Mn-Si Steel by High Accuracy FE-EPMA

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    DOI:10.2355/tetsutohagane.TETSU-2017-025

    Understanding of γ→α transformation during intercritical annealing is important to achieve precise control over the mechanical properties of low-carbon steels. And control of the carbon contents in the phases is the most important factor in alloy design for achieving high strength and high ductility. However, it is unusually difficult to determine the carbon contents in multiphase structures with high accuracy. So, we have developed new methods for suppressing hydrocarbon contamination during field emission (FE) EPMA measurements.Carbon enrichment at γ/α interface and carbon concentration of γ phase in Fe-0.15%C-2%Si-(1.5, 2.0)%Mn steels isothermally transformed at 750 and 800°C was measured using developed FE-EPMA. The paraequilibrium (PE) model gives much better predictions for carbon enrichment in 1.5%Mn steel for 15 s. The NPLE/PLE transition model of local equilibrium gives much better predictions in 2.0%Mn steel. But the interfacial carbon concentration agrees with the composition of PLE/NPLE transition line in all alloys annealing for 1800 s. Furthermore, carbon enrichment shifted from the PE to NPLE model during annealing.
  • Effect of Morphology of Dual-phase Structure on Inhomogeneous Plastic Deformation and Ductile Fracture in Ti-4%Cr Alloy

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    DOI:10.2355/tetsutohagane.TETSU-2017-026

    The morphology of (α+β) dual-phase structure in Ti-4%Cr alloy was controlled to be plate-like and equiaxed types by aging treatment and warm rolling, respectively. Tensile testing for the specimens with different morphology revealed that the equiaxed specimen was much superior to the plate-like one in elongation and reduction of area. The inhomogeneous and hierarchical strain distribution was quantitatively visualized for these specimens by DIC method, and it was found that the plastic strain is preferentially introduced into the softer phase of α, which results in a marked strain partitioning between α and β phases, particularly in the plate-like specimen. There were three conditions for preferential plastic deformation in the plate-like specimen: 1. α plate is aligned nearly in the direction of maximum shear stress, 2. the length and width of α plate is relatively large, and 3. Schmidt factor for prismatic slips is relatively large. As a result, the plastic strain is increased in such α plates and expanded along the plate, leading to a void formation at plate/plate or plate/β grain boundary junctions. On the other hand, the equiaxed specimen deforms uniformly with a less strain partitioning, and also, the strained regions are formed separately and hard to connect each other. Since the void formation is significantly delayed due to those reasons, the equiaxed specimen can continue plastic deformation to a higher strain regime.
  • Development of Large-Scale Pot Sinter Simulator with Material Segregation Charging System

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    DOI:10.2355/tetsutohagane.TETSU-2017-007

    It is indispensable to construct sinter pot in large-scale and to apply material segregation charging equipment, for there exist several significant dissimilarities between practical and lab-scale sinter facilities. From the issue, sinter pot for 300 kg material mixture with segregation charging system called ‘sinter simulator’ is developed. The system allows segregated materials being charged into fixed pot with proper sequential order, according to the result of stacking properties. In this paper, it is reported that stable and proper sintering procedure is obtained, and phenomena more precise to practical process is also simulated, confirming the results of product yield recovered with core sampler.

Article Access Ranking

20 Sep. (Last 30 Days)

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  3. Visualization of 3 Dimensional Distributions of Non-Metallic Inclusions in Steels Tetsu-to-Hagané Vol.103(2017), No.8
  4. Preface to the Special Issue on “Challenges and Progress of Science and Methodology to Thermophysical Properties of Molten Alloys, Slags and Fluxes at High Temperatures” ISIJ International Vol.57(2017), No.8
  5. Influence of P2O5 on Dissolution Behavior of Lime in Molten Slag ISIJ International Advance Publication
  6. Intra–Particle Water Migration Dynamics during Iron Ore Granulation Process ISIJ International Vol.57(2017), No.8
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  10. Improvement of Strength–Elongation Balance of Al–Mg–Si Sheet Alloy by Utilising Mg–Si Cluster and Its Proposed Mechanism MATERIALS TRANSACTIONS Vol.58(2017), No.5

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