Effects of Dynamic Recrystallization on γ Grain Refinement and Improvement of Micro Segregation of As Cast Austenite in 9%Ni Steel
スポンサーリンク
概要
- 論文の詳細を見る
Effects of dynamic recrystallization on γ grain refinement and improvement in micro segregation of elements such as Ni and Mn of as cast austenite in 9% Ni steel were investigated by two kinds of experimental methods. The first one was a hot compression test using the specimens prepared from the strand cast slab and the hot rolled plate of 9% Ni steel, and the other was a hot tensile straining test in the austenitic region after levitation melting and solidification. In the hot compression test, variations in onset strain and flow stress of steady state flow of dynamic recrystallization with hot deformation conditions were investigated. The onset strain was found to decrease below 0.25 at the temperatures above 1523 K and the strain rate below 1×10-2s-1. The activation energy value obtained from steady state flow stress was 421 kJ/mol. Dynamically recrystallized γ grain size in as cast austenite of this steel was controlled simply by Z value with no dependence on the initial γ grain size. This beneficial feature of dynamic recrystallization was confirmed by the experiment of tensile straining in austenite formed after levitation melting and solidification, where extremely coarse initial γ grain size of around 1.9 mm was markedly refined down to 140 μm by straining such a small strain as 0.40. Micro segregation ratio of Ni and Mn in the strand cast 9% Ni steel examined by EPMA analysis was 1.20 and 1.36, respectively. These values were found to decrease continuously with reduction in strain rate in hot deformation of austenite. That is, dynamic recrystallization in austenite taken place at lower strain rate deformation is much more effective for homogenization of segregated elements compared with high strain rate deformation.
- 社団法人 日本鉄鋼協会の論文
- 2005-03-15
著者
-
MURAKAMI Taichi
Department of Materials Processing, Tohoku University
-
Murakami T.
Department of Physics, Kyoto University
-
Ouchi Chiaki
Tohoku University
-
NARUSHIMA T.
Tohoku University Biomedical Engineering Research Organization
-
IGUCHI Y.
Department of Materials Processing, Tohoku University
-
OUCHI C.
Tohoku University Biomedical Engineering Research Organization
-
HOTTA S.
Department of Metallurgy, Tohoku University
-
NARUSHIMA T.
Department of Materials Processing, Tohoku University
-
OUCHI C.
Department of Materials Processing, Tohoku University
-
Iguchi Y
Department Of Materials Processing Tohoku University
-
Murakami T.
Department Of Applied Physics National Defense Academy
-
Narushima T
Tohoku University Biomedical Engineering Research Organization
-
Hotta S.
Department Of Electrical Electronic And Information Engineering Osaka University
-
Hotta S.
Department Of Metallurgy Tohoku University
関連論文
- Surface Hardening Treatment for Titanium Materials Using Ar-5%CO Gas in Combination with Post Heat Treatment under Vacuum
- 25pZB-7 φ photo-production from nuclei at SPring-8/LEPS(Hadron and nuclear physics with electromagnetic probe)
- Boron and Nitrogen in GaAs and InP Melts Equilibrated with B_2O_3 Flux
- Behavior of Oxygen in Ga-As Melts with the Range of As Content up to 5 mass % Equilibrated with B_2O_3 Flux
- Activity of Ga_2O_3 in B_2O_3 Flux and Standard Free Energies of Formation of CaBO_3 and InBO_3
- Dynamic and Static Restoration Behaviors of Pure Lead and Tin in the Ambient Temperature Range
- The Effect of Solute Elements on Hardness and Grain Size in Platinum Based Binary Alloys
- Development of a New Method for Manufacturing Iron Foam Using Gases Generated by Reduction of Iron Oxide
- Hydrothermal Synthesis of Zeolite A Using Blast Furnace Slag
- Dissimilar Metal Joining of Aluminum to Steel by MIG Arc Brazing Using Flux Cored Wire
- Effect of Tool Plunging Downforce on Friction Stir Welding of ADC12 Die Cast Alloy(Physics, Processes, Instruments & Measurements, INTERNATIONAL SYMPOSIUM OF JWRI 30TH ANNIVERSARY)
- Dissimilar Metal Joining of Steel to Aluminum by Lap Joint MIG Arc Brazing(Physics, Processes, Instruments & Measurements, INTERNATIONAL SYMPOSIUM OF JWRI 30TH ANNIVERSARY)
- Mechanisms of Carburization and Melting of Iron by CO Gas
- Mechanism of Carburizing Followed by Melting of Iron by CO Gas
- The Effects of the Oxygen-enriched Surface Layer on Mechanical Properties of α+β Type Titanium Alloys
- Fatigue Behaviors of Ultra Fine Wires of β-Type and α-Type Titanium Alloys
- Oxidation or Nitridation Behavior of Pure Chromium and Chromium Alloys Containing 10mass%Ni or Fe in Atmospheric Heating
- Alloy Design and Property Evaluation of New β Type Titanium Alloy with Excellent Cold Workability and Biocompatibility
- Preparation of Calcium Phosphate Films by Radiofrequency Magnetron Sputtering
- Grain Refinement of As Cast Austenite by Dynamic Recrystallization in HSLA Steels
- Solubilities and Equilibrium Distribution Coefficients of Oxygen and Carbon in Silicon
- Experimental Study of in-medium meson modification at the KEK 12 GeV PS(Hadrons at finite density)
- Measurements of Mass Modification of Vector Mesons in Nuclear Matter(§6. Mesons in Nuclei,Possible Existence of the σ-Meson and Its Implications to Hadron Physics)
- Mechanisms of Pig-iron Making from Magnetite Ore Pellets Containing Coal at Low Temperature
- Alloy Design and Properties of New α+β Titanium Alloy with Excellent Cold Workability, Superplasticity and Cytocompatibility
- Evaluation of Sliding Wear Resistant Property of C. P. Titanium and SP-700 Titanium Alloy Surface-hardened by Ar-5%CO Gas
- Variations in the Microstructure and Hardness with Solution Treating and Aging Conditions in New α+β Titanium Alloy Ti-4.5%Al-6%Nb-2%Fe-2%Mo
- β Grain Refinement due to Small Amounts of Yttrium Addition in α+β Type Titanium Alloy, SP-700
- Austenitic Grain Growth behavior Immediately after Dynamic Recrystallization in HSLA Steels and Austenitic Stainless Steel
- Surface Hardening Treatment for C.P. Titanium and Titanium Alloys in Use of Ar-5%CO Gas
- Effects of Dynamic Recrystallization on γ Grain Refinement and Improvement of Micro Segregation of As Cast Austenite in 9%Ni Steel
- Strength-Ductility Relationship in Solution Treated and Aged α+β Type Ti-4.5%Al-3%V-2%Fe-2%Mo Titanium Alloy
- High-Temperature Oxidation of Silicon Carbide and Silicon Nitride
- Effect of β Phase Stability at Room Temperature on Mechanical Properties in β-Rich α+β Type Ti-4.5Al-3V-2Mo-2Fe Alloy
- Effect of Al on ω phase transformation behavior in Ti-8V-5Fe-(1-3)Al alloy
- Effect of Annealing Treatment after Furnace Cooling Treatment on Fracture Toughness of Ti-4.5Al-3V-2Mo-2Fe
- Fracture Characteristics of Ti-4.5Al-3V-2Mo-2Fe Conducted with Slow Furnace Cooling from Solution Treatment Temperature in α+β Field
- Effect of β Phase Stability on Mechanical Properties in a β-Rich α+β Type Titanium Alloy
- Effect of Cooling Rate on Microstructure and Fracture Characteristics of β-Rich α+β Type Ti-4.5Al-3V-2Mo-2Fe Alloy
- Alkali Hydrothermal Synthesis of Zeolite A Using Oxide By-products
- Immunohistochemical Localization of CA125 in Epithelial Ovarian Tumors
- PLASMAPHERESIS FOR PREVENTION OF RECURRENT FGS OF KIDNEY ALLOGRAFT IN ADULT RECIPIENTS
- P-55 Dietary Docosahexaenoic Acid Intake during Gestation and Lactation Period and the Preweaning Reflex Development of Wistar Rats.
- Dietary Docosahexaenoic Acid Intake during Gestation and Lactation Period and the Preweaning Reflex Development of the Stroke-Prone Spontaneously Hypertensive Rat : Poster Sessions
- Rapid and High Sensitive Detection of Bacteria Sensor using a Porous Ion Exchange Film
- Galvanic Corrosion Suppression of High-k/Metal Gates using Organic Solvent based HF
- A-10 A Case of Fetal Bladder Rupture Due to Urethral Atresia.
- Solubility of Carbon in Liquid Silicon Equilibrated with Silicon Carbide
- Recovery of Calcium from BF Slag and Synthesis of Zeolite A Using Its Residue