scholarly journals Effect of Heat Treatment on the Microstructure and Tensile Deformation Behavior of Oxide Dispersion Strengthened Alloys Manufactured by Complex Milling Process

2017 ◽  
Vol 62 (2) ◽  
pp. 1335-1340
Author(s):  
Y.-K. Kim ◽  
J.-H. Kim ◽  
J.-H. Gwon ◽  
K.-A. Lee
Keyword(s):  
Heat Treatment ◽  
Ball Milling ◽  
Deformation Behavior ◽  
Tensile Deformation ◽  
Oxide Dispersion Strengthened ◽  
Tensile Tests ◽  
Milling Process ◽  
Tensile Deformation Behavior ◽  
Oxide Particles ◽  
Ods Alloy

Abstract This study attempted to manufacture an ODS alloy by combining multiple milling processes in mechanical alloying stage to achieve high strength and fracture elongation. The complex milling process of this study conducted planetary ball milling, cryogenic ball milling and drum ball milling in sequential order, and then the microstructure and tensile deformation behavior were investigated after additional heat treatment. The oxide particles distributed within the microstructure were fine oxide particles of 5~20 nm and coarse oxide particles of 100~200 nm, and the oxide particles were confirmed to be composed of Cr, Ti, Y and O. Results of tensile tests at room temperature measured yield strength, tensile strength and elongation as 1320 MPa, 2245 MPa and 4.2%, respectively, before heat treatment, and 1161 MPa, 2020 MPa and 5.5% after heat treatment. This results indicate that the ODS alloy of this study gained very high strengths compared to other known ODS alloys, allowing greater plastic zones.

scholarly journals Effect of Pulsed Current on the Tensile Deformation Behavior and Microstructure Evolution of AZ80 Magnesium Alloy

Materials ◽  
2020 ◽  
Vol 13 (21) ◽  
pp. 4840
Author(s):  
Hong Xu ◽  
You Zhou ◽  
Yu-Jie Zou ◽  
Meng Liu ◽  
Zhi-Peng Guo ◽  
...  
Keyword(s):  
Flow Stress ◽  
Magnesium Alloy ◽  
Deformation Behavior ◽  
Tensile Deformation ◽  
Electron Backscatter Diffraction ◽  
Local Stress ◽  
Tensile Tests ◽  
Pulsed Current ◽  
Tensile Deformation Behavior ◽  
Az80 Magnesium Alloy

In this work, the tensile deformation behavior of an as-extruded AZ80 magnesium alloy under pulsed current (PC) was investigated based on microstructure observations. We found that compared with the tensile tests at room temperature (RT) and given temperature (GT), the flow stress is reduced due to both thermal and athermal effects of pulsed current. A quasi-in-situ electron backscatter diffraction (EBSD) analysis reveals that at the same strain, the geometrically necessary dislocation (GND) density of the RT sample is the highest, followed by the GT sample and the PC sample. This proves that the athermal effect can promote the annihilation of dislocations and slow down dislocation pileup, which reduces the flow stress. In addition, the twinning behavior under different deformation conditions was studied; the twins are {10−12} tension twins, which are activated with the assistance of local stress. We found that the twin fraction in the PC sample is lower than that in the RT and GT samples, due to the least accumulation of GNDs at grain boundaries, which decreases the nucleation of {10−12} tension twins.

Deformation Behavior of Nitrogen Bearing Austenitic Steels with Various Nitrogen Contents

2007 ◽  
Vol 345-346 ◽  
pp. 117-120 ◽  
Author(s):  
Yong Suk Kim ◽  
Seung Man Nam ◽  
Sung Joon Kim
Keyword(s):  
Nitrogen Content ◽  
Deformation Behavior ◽  
Tensile Deformation ◽  
Constant Strain Rate ◽  
Tensile Tests ◽  
Austenitic Steels ◽  
High Nitrogen ◽  
Tensile Deformation Behavior ◽  
Nitrogen Steel ◽  
Nitrogen Contents

Tensile deformation behavior of the high-nitrogen austenitic Fe-18Cr-14Mn-4Ni-3MoxN steel with various nitrogen contents has been studied. The nitrogen content of the steel varied from 0.28 to 0.88 wt. %. Nitrogen atoms in high nitrogen steel (HNS) make an interstitial solid solution by being scattered in the steel constituting a short-range order. They strengthen the austenite matrix without deteriorating ductility of the steel. The present investigation was carried out to elucidate the hardening and plasticizing role of the nitrogen in the HNS by analyzing tensile deformation behavior of the steel containing various nitrogen contents. Tensile tests of the steel specimens were performed at room temperature with a constant strain rate of 5x10-5/sec. Microstructure of the tested specimens was analyzed to explore the deformation mechanism of the HNS as a function of nitrogen contents. The flow stress of the steel increased with the increase of the nitrogen content; however, the specimen with the highest nitrogen content (0.88 wt. %) showed saturated strength and reduced ductility. The superior mechanical property of the HNS was explained by the low stacking fault energy and the twin-induced plasticity provoked by the nitrogen.

Effect of heat treatment on tensile deformation behavior of Ni–Co film/Fe substrate systems

2012 ◽  
Vol 22 (7) ◽  
pp. 1613-1619 ◽  
Author(s):  
Min-jie ZHANG ◽  
Yong PAN ◽  
Zhao-feng ZHOU ◽  
Wei LI ◽  
Jian-ke HUI ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Deformation Behavior ◽  
Tensile Deformation ◽  
Tensile Deformation Behavior

scholarly journals Study on Microstructure and In Situ Tensile Deformation Behavior of Fe-25Mn-xAl-8Ni-C Alloy Prepared by Vacuum Arc Melting

Metals ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 814
Author(s):  
Yaping Bai ◽  
Meng Li ◽  
Chao Cheng ◽  
Jianping Li ◽  
Yongchun Guo ◽  
...  
Keyword(s):  
Tensile Strength ◽  
Deformation Behavior ◽  
Tensile Deformation ◽  
Austenite Phase ◽  
Vacuum Arc ◽  
Al Content ◽  
Arc Melting ◽  
Vacuum Arc Melting ◽  
Tensile Deformation Behavior

In this study, Fe-25Mn-xAl-8Ni-C alloys (x = 10 wt.%, 11 wt.%, 12 wt.%, 13 wt.%) were prepared by a vacuum arc melting method, and the microstructure of this series of alloys and the in situ tensile deformation behavior were studied. The results showed that Fe-25Mn-xAl-8Ni-C alloys mainly contained austenite phase with a small amount of NiAl compound. With the content of Al increasing, the amount of austenite decreased while the amount of NiAl compound increased. When the Al content increased to 12 wt.%, the interface between austenite and NiAl compound and austenitic internal started to precipitate k-carbide phase. In situ tensile results also showed that as the content of Al increased, the alloy elongation decreased gradually, and the tensile strength first increased and then decreased. When the Al content was up to 11 wt.%, the elongation and tensile strength were 2.6% and 702.5 MPa, respectively; the results of in situ tensile dynamic observations show that during the process of stretching, austenite deformed first, and crack initiation mainly occurred at the interface between austenite and NiAl compound, and propagated along the interface, resulting in fracture of the alloy.

The effect of strain rates on tensile deformation of ultrafine-grained copper

2017 ◽  
Vol 31 (16-19) ◽  
pp. 1744014
Author(s):  
M. Li ◽  
Q. W. Jiang
Keyword(s):  
Strain Rate ◽  
Deformation Behavior ◽  
Room Temperature ◽  
Tensile Deformation ◽  
Strain Rates ◽  
Roll Bonding ◽  
Fracture Elongation ◽  
Tensile Deformation Behavior ◽  
Ultrafine Grained ◽  
Flow Stress Level

Tensile deformation behavior of ultrafine-grained (UFG) copper processed by accumulative roll-bonding (ARB) was studied under different strain rates at room temperature. It was found that the UFG copper under the strain rate of 10[Formula: see text] s[Formula: see text] led to a higher strength (higher flow stress level), flow stability (higher stress hardening rate) and fracture elongation. In the fracture surface of the sample appeared a large number of cleavage steps under the strain rate of 10[Formula: see text] s[Formula: see text], indicating a typical brittle fracture mode. When the strain rate is 10[Formula: see text] or 10[Formula: see text] s[Formula: see text], a great amount of dimples with few cleavage steps were observed, showing a transition from brittle to plastic deformation with increasing strain rate.

Compressive and tensile deformation behavior of consolidated Fe

2008 ◽  
Vol 493 (1-2) ◽  
pp. 226-231 ◽  
Author(s):  
S. Cheng ◽  
W.W. Milligan ◽  
X.-L. Wang ◽  
H. Choo ◽  
P.K. Liaw
Keyword(s):  
Deformation Behavior ◽  
Tensile Deformation ◽  
Tensile Deformation Behavior
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