Last. Hamed Mirzadeh(UT: University of Tehran)H-Index: 38
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Recent progress in the understanding of the deformation-induced martensitic transformation, the transformation-induced plasticity (TRIP) effect, and the reversion annealing in the metastable austenitic stainless steels are reviewed in the present work. For this purpose, the introduced methods for the measurement of martensite content are summarized. Moreover, the austenite stability as the key factor for controlling the austenite to martensite transformation is critically discussed. This is real...
#1Jian-Sin Li(NTOU: National Taiwan Ocean University)H-Index: 2
#2Guan-Ju Cheng(NTU: National Taiwan University)H-Index: 5
Last. Jer-Ren Yang(NTU: National Taiwan University)H-Index: 42
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Abstract After deformation, super duplex stainless steel (DSS) was annealed at 1100 °C for a two-phase solid–solution region to avoid σ formation. Preferred orientations in δ and γ phases changed to (111)δ, (100)δ, and (101)γ from the rough random orientation of as-received super DSS. The kernel average misorientation (KAM) angle was less than 5° implying the grain boundary misorientation strain shifted to a higher value after cold rolling, which was consistent with the X-ray diffraction (XRD) m...
#1Shenglong Wang(USTB: University of Science and Technology Beijing)H-Index: 3
#2Mingxian Zhang(USTB: University of Science and Technology Beijing)H-Index: 5
Last. Bin Yang(USTB: University of Science and Technology Beijing)H-Index: 21
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Abstract In this study, the dynamic recrystallization behaviors of a nuclear grade 316LN austenitic stainless steel were researched through hot compression experiment performed on a Gleeble-1500 simulator at temperatures of 900–1250 °C and strain rates of 0.01–1 s − 1 . By multiple linear regressions of the flow stress-strain data, the dynamic recrystallization mathematical models of this steel as functions of strain rate, strain and temperature were developed. Then these models were verified in...
Last. B. Bemanizadeh(IAU: Islamic Azad University)H-Index: 2
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The 4340 steel is extensively utilized in several industries including automotive and aerospace for manufacturing a large number of structural components. Due to the importance of thermo-mechanical processing in the production of steels, the dynamic recrystallization (DRX) characteristics of 4340 steel were investigated. Namely, hot compression tests on 4340 steel have been performed in a temperature range of 900–1200 °C and a strain rate range of 0. 01–1 s−1 and the strain of up to 0. 9. The re...
316LN is a type of austenitic stainless steel whose grain refinement only depends on hot deformation. The true stress–strain curves of 316LN were obtained by means of hot compression experiments conducted at a temperature range of 900–1200°C and at a strain rate range of 0·001–10 s−1. The influence of deformation parameters on the microstructure of 316LN was analysed. Both the constitutive equation for 316LN and the model of grain size after dynamic recrystallisation were established, and the ef...
4340 steel is extensively utilized in the automotive industries and for a large number of general purposes. Due to the importance of thermo-mechanical processing in the production of steels, the dynamic recrystallization (DRX) characteristics of 4340 steel were investigated in the present study. Namely, hot compression tests on 4340 steel have been performed at a temperature range of 900–1200°C, a strain rate range of 0.01–1 sec–1, and a strain of 0.9. The resulting flow stress curves show the o...
In this investigation, hot compression tests were performed at 900 °C − 1100 °C and strain rate of 0.001 − 0.1 s−1 to study hot deformation behavior and flow stress model of 4130 steel. Based on the classical stress–dislocation relations and the kinematics of the dynamic recrystallization, the flow stress constitutive equations of the work hardening-dynamical recovery period and dynamical recrystallization period were established for 4130 steel, respectively. The validity of the model was demons...
#2Kinga Rodak(Silesian University of Technology)H-Index: 9
The paper presents the results of research concerning the influence of hot plastic forming parameters on the deformability and structure of a Fe-Ni austenitic alloy. The research was performed on a torsion plastometer in the range of temperatures of 900-1150 °C, at a strain rate 0.1 and 1.0 s-1. Plastic properties of the alloy were characterized by the worked out flow curves and the temperature relationships of flow stress and strain limit. The structural inspections were performed on microsecti...
Last. Oscar Balancin(UFSCar: Federal University of São Carlos)H-Index: 12
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Abstract Microstructure change of α (ferrite) + γ (austenite) two-phase structure in duplex stainless steels deformed by hot torsion tests is briefly analyzed. Two types of stainless steels containing different volume fractions of ferrite and austenite were torsion deformed at temperatures ranging from 900 to 1250 °C. Steel A (25.5Cr–4.9Ni–1.6Mo) contained Cr eq /Ni eq = 4.8 and steel B (22.2Cr–5.6Ni–3Mo) contained Cr eq /Ni eq = 3.5 bring about different microstructures and flow stress behaviou...
#1Amir Momeni(AUT: Amirkabir University of Technology)H-Index: 26
#2Kamran Dehghani(AUT: Amirkabir University of Technology)H-Index: 30
In this research, aging treatments at temperatures of 800 and 900 ‐ C for difierent aging time of 5{60 min were conducted on solution treated as well as hot worked samples of 2205 dual phase stainless steel. The efiect of aging treatment on precipitation of intermetallic phases was investigated in undeformed specimens and those subjected to hot deformation with difierent strain rates of 0.001{1 s i1 . It was found that ae precipitation increased by hot working. It was also concluded that the vol...