Sadahiro Yamamoto
Ultimate tensile strengthEngineeringLattice constantSolid solutionEmbrittlementKineticsChemical compositionRecrystallization (metallurgy)Composite materialIntergranular corrosionMetallurgyGrain sizeMaterials scienceNitrideDeformation (meteorology)CorrosionTransformation (music)BorideHigh-strength low-alloy steelAustenitic stainless steelAlloyAuger Electron SpectrometerWear resistanceRolling contact fatigueLattice distortionTi 6al 4vCommercially pure titaniumThermo mechanicalCompression testAustenite grainTheme (computing)BainiteCarbonTitaniumCarbideResistance (ecology)DuctilityNucleationVolume fractionAnnealing (metallurgy)Forensic engineeringMechanical engineeringEquiaxed crystalsPrecipitation (chemistry)MicrostructureWeldabilityAusteniteToughness
15Publications
4H-index
87Citations
Publications 15
Newest
#1Hiroyasu YokoyamaH-Index: 3
#2Shinji MitaoH-Index: 4
Last. Toru SugiyamaH-Index: 1
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NKK has developed high strength bainitic steel rails with superior flaking resistance for heavy haul railways. In this paper, rolling contact fatigue and wear behavior in bainitic and pearlitic rail steels with various tensile strengths were studied. Emphasis was placed on examining the formation behavior of the WEL(White Etching Layer) in bainitic and pearlitic steels, and its effect on flaking resistance. Advantages of the newly developed high-strength bainitic steel with superior flaking resi...
25 Citations
1 CitationsSource
#1Hiroyasu YokoyamaH-Index: 3
#2Shinji MitaoH-Index: 4
Last. Sadahiro YamamotoH-Index: 4
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1 CitationsSource
#1Sadahiro YamamotoH-Index: 4
#2Hiroyasu YokoyamaH-Index: 3
Last. Masakazu NiikuraH-Index: 3
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The effects of austenite grain size and deformation in the unrecrystallized austenite region on bainite transformation behavior and microstructural characteristics were investigated under continuous cooling condition and compared with those in ferrite-pearlite transformation and martensite transformation. Austenite grain size does not affect the transformation temperature and resulting microstructure of bainitic ferrite except that nucleation site of bainitic ferrite is increased with the decrea...
32 CitationsSource
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3 CitationsSource
1 CitationsSource
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#1Sadahiro YamamotoH-Index: 4
#2Tetsuo SakiyamaH-Index: 1
Last. Chiaki OuchiH-Index: 17
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The effect of various alloying elements on static recovery and recrystallization kinetics in Ni-Cr austenitic stainless steels was investigated by an intermittent two stage hot compression test. Types 304 and 316 stainless steels showed a marked retardation of recrystallization kinetics compared with that of austenite in 0.25%Si-1.25%Mn steel. This retardation was found to arise from solid solution effect of Cr, but not of Ni. The finish-rolling temperature to attain the completely recrystallize...
12 CitationsSource