Mechanical behavior and microstructure evolution during steady-state dynamic recrystallization in the austenitic steel 800H

Mechanical behavior and microstructure evolution of Ti and Ti-64 titanium alloy during warm “abc” deformation has been studied. The “abc” deformation was consisted of successive compression of a sample along three orthogonal directions. Mechanical behavior of each material was described by set of successive σ-ε curves combined into cumulative σ-Σε curve. Microstructure of Ti was found to be refined to a grain size of about 0.4 μm due to formation of deformation-induced boundaries within initial grains. Although a stage like steady state flow was observed at the cumulative σ-Σε curve such mechanical behavior was hardly associated with superplastic flow. In two-phase Ti-64 alloy the structure was found to be refined to a grain size of about 0.4 μm after warm “abc” deformation due to globularization α- and β-particles following breaking down of α-lamellar and β- layers. Microstructure refinement of the alloy was associated with softening and superplastic flow.

Download Full-text

Correlation between grain size and flow stress during steady-state dynamic recrystallization

Materials Science and Engineering A ◽

10.1016/j.msea.2015.04.046 ◽

2015 ◽

Vol 638 ◽

pp. 357-362 ◽

Cited By ~ 8

Author(s):

Houquan Liang ◽

Hongzhen Guo ◽

Kai Tan ◽

Y.Q. Ning ◽

Xin Luo ◽

...

Keyword(s):

Grain Size ◽

Steady State ◽

Flow Stress ◽

Dynamic Recrystallization ◽

State Dynamic

Download Full-text

Microstructure Evolution and Properties of Ti-6Al-4V Alloy Doped with Fe and Mo during Deformation at 800°C

Defect and Diffusion Forum ◽

10.4028/www.scientific.net/ddf.385.144 ◽

2018 ◽

Vol 385 ◽

pp. 144-149 ◽

Cited By ~ 1

Author(s):

Denis Klimenko ◽

Maxim Ozerov ◽

Santharam Suresh ◽

Nikita Stepanov ◽

Mikhail A. Tikhonovsky ◽

...

Keyword(s):

Steady State ◽

Mechanical Behavior ◽

Titanium Alloys ◽

Strain Hardening ◽

Uniaxial Compression ◽

Microstructure Evolution ◽

Steady State Flow ◽

Globular Microstructure ◽

Flow Response ◽

Alpha Beta

Microstructure evolution and mechanical behavior of alpha/beta Ti-6Al-4V and Ti-6Al-4V-0.75Mo-0.5Fe titanium alloys during uniaxial compression to a height strain of 70% was studied. The plastic-flow response for both alloys is characterized by successive stages of strain hardening, flow softening, and steady-state flow. During compression the lamellae spheroidized to produce a globular microstructure with higher rate of globularization in Ti-6Al-4V-0.75Mo-0.5Fe. The globularization kinetics in Ti-6Al-4V-0.75Mo-0.5Fe was also found to be much faster than that in Ti-6Al-4V. This difference can be partially associated with different interphase energy due to doping of β-stabilizing elements.

Download Full-text

Microstructure evolution and mechanical behavior of a new microalloyed high Mn austenitic steel during compressive deformation

Materials Science and Engineering A ◽

10.1016/j.msea.2014.07.084 ◽

2014 ◽

Vol 615 ◽

pp. 424-435 ◽

Cited By ~ 19

Author(s):

M. Eskandari ◽

A. Zarei-Hanzaki ◽

J.A. Szpunar ◽

M.A. Mohtadi-Bonab ◽

A.R. Kamali ◽

...

Keyword(s):

Mechanical Behavior ◽

Austenitic Steel ◽

Microstructure Evolution ◽

Compressive Deformation

Download Full-text

Multiscale modeling of hot-working with dynamic recrystallization by coupling microstructure evolution and macroscopic mechanical behavior

International Journal of Plasticity ◽

10.1016/j.ijplas.2013.09.001 ◽

2014 ◽

Vol 52 ◽

pp. 105-116 ◽

Cited By ~ 51

Author(s):

Tomohiro Takaki ◽

Chihiro Yoshimoto ◽

Akinori Yamanaka ◽

Yoshihiro Tomita

Keyword(s):

Dynamic Recrystallization ◽

Mechanical Behavior ◽

Multiscale Modeling ◽

Microstructure Evolution ◽

Hot Working

Download Full-text

Investigation of the microstructure evolution in TP347HFG austenitic steel at 700°C and its characterization method

High Temperature Materials and Processes ◽

10.1515/htmp-2021-0013 ◽

2021 ◽

Vol 40 (1) ◽

pp. 12-22

Author(s):

Yuetao Zhang ◽

Tingbi Yuan ◽

Yawei Shao ◽

Xiao Wang

Keyword(s):

Austenitic Steel ◽

Aging Time ◽

Microstructure Evolution ◽

Precipitate Phase ◽

Dispersion Strengthening ◽

Micro Hardness ◽

Dispersed Particles ◽

Nonlinear Ultrasonic ◽

The Matrix ◽

Solution Strengthening

Abstract This article reports the microstructure evolution in TP347HFG austenitic steel during the aging process. The experiments were carried out at 700°C with different aging time from 500 to 3,650 h. The metallographic results show that the coherent twin and incoherent twin are existed in the original TP347HFG grains, while they gradually vanished with the increase of the aging time. After aging for 500 h, a lot of fine, dispersed particles precipitated from the matrix, but they disappeared after aging for 1,500 h. When the aging time extend to 3,650 h, the precipitates appeared apparently coarse in TP347HFG steel, which include the M23C6 and σ phase; besides, the micro-hardness of TP347HFG also changes during the aging, which was closely related to the effect of dispersion strengthening and solution strengthening. The results of the nonlinear ultrasonic measurement reveal that the β′ of TP347HFG steel was also changed with the aging time. It first increased at 0–500 h, then reduced later, and increased finally at 1,500–3,650 h. The variation of β′ in TP347HFG was influenced by a combined effect of the twin microstructure and the precipitate phase, which indicate that the nonlinear ultrasonic technique can be utilized to characterize the microstructure evolution in TP347HFG.

Download Full-text